Unit

1
Introduction to VEX and Robotics

Unit1:

VEX lab kits bring robotics into the classroom, making it a fun and educational experience for all.
In this introductory unit, you review the kit and parts that make up the VEX Protobot. In addition,
you start using Autodesk Inventor. This solid modeling software makes it easy to design and
analyze robot parts.

VEX Protobot

Unit Objectives
After completing Unit 1: Introduction to VEX and Robotics, you will be able to:

Review the basic components of a robot.

Review the parts in the VEX Classroom Lab Kit.
Work with VEX parts.
Get started with Autodesk Inventor.
Identify and use the different parts of the VEX Classroom Lab Kit to complete subassemblies in the
creation of a tumbler.
Build a robot component.

Prerequisites
Before starting Unit 1: Introduction to VEX and Robotics, it would be helpful to:

Open and unpack your VEX Classroom Lab Kit.

Read the VEX documentation provided in the VEX Classroom Lab Kit. (VEX documentation is
also available under Education and Competition Resources on the VEX Robotics web site at
http://www.VEXrobotics.com/edr-resources. )
Install Autodesk Inventor Professional 2009. Teachers, join and invite your students to join the
Student Community to download free Autodesk Inventor software, so they can continue their
coursework at home. Join the Autodesk Student Engineering and Design Community at
http://www.autodesk.com/edcommunity.

Key Terms and Definitions

The following key terms are used in Unit 1: Introduction to VEX and Robotics.

Term

Definition

Autonomous

Describes a robotic system that carries out programs or performs tasks

without outside control by acquiring, processing, and acting on
environmental information.

Behavior

Behavior is exhibited in response to different inputs. The output devices of

a robot are how the robot exhibits its behavior.

Body

The robot body can be of any shape and size. The majority of actual robots
look nothing like their human creators. They are typically designed more
for function than appearance.

Central Processing
Unit (CPU)

Directs a robots behavior autonomously, through human instructions, or

from a combination thereof. It must also be able to receive input from
sensors that provide information on its position and environment.

Control System

A program that tells the robot how to act in different circumstances, and
the electronics that process the information. This programming can be very
simple or extraordinarily complex, but it is designed to enable the machine
to react to its environment through code or sensory input such as touch,
temperature, and light sensors.

Unit 1: Introduction to VEX and Robotics

Term

Definition

Robot

A programmable, mechanical device that can perform tasks and interact

with its environment.

Tele-operated

Describes a robotic system that is human controlled.

Required Supplies and Software

The following supplies and software are used in Unit 1: Introduction to VEX and Robotics.
Supplies

Software

VEX Classroom Lab Kit

Autodesk Inventor Professional 2009

Notebook and pen

Work surface
Small storage container for loose parts
Two obstacles. This can be any small object in your class.
10' x 4' of open space against a wall

Academic Standards
The following national academic standards are supported in Unit 1: Introduction to VEX and Robotics.
Phase

Standard

Think

Science (NSES)
Unifying Concepts and Processes: Form and Function
Science and Technology: Abilities of Technological Design
Technology (ITEA)
3.2: Core Concepts of Technology
3.3: Relationships Among Technologies
4.5: The Effects of Technology on the Environment
4.7: The Influence of Technology on History
Mathematics (NCTM)
Connections
Recognize and apply mathematics in contexts outside of mathematics.

Phase

Standard

Create

Science (NSES)
Unifying Concepts and Processes: Form and Function
Physical Science: Motions and Forces
Science and Technology: Abilities of Technological Design
Technology (ITEA)
5.8: The Attributes of Design
5.9: Engineering Design
6.12: Use and Maintain Technological Products and Systems
Mathematics (NCTM)
Numbers and Operations
Understand numbers, ways of representing numbers, relationships among
numbers, and number systems.
Algebra Standard
Understand patterns, relations, and functions.
Geometry Standard
Use visualization, spatial reasoning, and geometric modeling to solve problems.
Measurement Standard
Understand measurable attributes of objects and the units, systems, and
processes of measurement.

Build

Science (NSES)
Unifying Concepts and Processes: Form and Function
Science and Technology: Abilities of Technological Design
Technology (ITEA)
3.2: Core Concepts of Technology
3.3: Relationships Among Technologies
Mathematics (NCTM)
Connections
Recognize and apply mathematics in contexts outside of mathematics.

Amaze

Science (NSES)
Unifying Concepts and Processes: Form and Function
Science and Technology: Abilities of Technological Design
Technology (ITEA)
3.2: Core Concepts of Technology
Mathematics (NCTM)
Connections
Recognize and apply mathematics in contexts outside of mathematics.

Unit 1: Introduction to VEX and Robotics

What Is Robotics?
What Is a Robot?
A robot is a programmable mechanical device that can perform tasks and interact with its
environment (with no human interaction).
The word robot was coined by the Czech playwright Karel Capek in 1921. He wrote a play called R.U.R.
(Rossums Universal Robots) that was about a slave class of manufactured human-like servants and
their struggle for freedom. The Czech word robota loosely means compulsive servitude. The word
robotics was first used by the famous science fiction writer, Isaac Asimov.

A childs wind-up toy shares many of the characteristics of a robot,

but lacks a control system that guides its behavior.

Basic Components of a Robot

The components of a robot are the body, control system, central processing unit, and behavior.
Body The body can be of any shape and size. Most people are comfortable with human-sized and
shaped robots that they have seen in movies, but the majority of actual robots look nothing like their
human creators. They are typically designed more for function than appearance.
Control System The control system is a program that tells the robot how to act in different
circumstances and the electronics that process the information. This programming can be very simple
or extraordinarily complex, but it is designed to allow the machine to react to its environment through
code or sensory input (touch, temperature, and light sensors). The program is the robots set of
instructions.

What Is Robotics?

Central Processing Unit The Central Processing Unit (CPU) of a robot directs its behavior in
response to different circumstances or inputs. If not autonomous, the robot must be able to receive
human instructions that define its tasks. It must also receive input from sensors that provide
information on its position and environment.
Behavior Behavior is exhibited in response to different inputs. The output devices of a robot are how
the robot exhibits its behavior.

Uses of Robots
Robots are used for:

Precision work
Repetitive/monotonous work
Dangerous work
Exploration
Competition
Education

Precision Work
Programming a robotic arm to make something like a peanut butter and jelly sandwich could take
hundreds of instructions. That is why in factories that use robotic devices, each device is designed and
programmed to do just a few steps of the manufacturing process over and over again. The item being
manufactured goes from one robotic station to the next until it is completed.

Unit 1: Introduction to VEX and Robotics

Robots can be programmed to do things that humans would grow tired of very easily or cause
damage to the human body by repetitive movements (weld cars together, stack boxes, and so on).

A Boeing X-45A Unmanned Combat Aerial Vehicle (UCAV) during flight

tests at NASA Dryden Flight Research Center. (NASA image)

Dangerous Work
Robots can be designed to perform tasks that would be difficult, dangerous, or impossible for humans
to do. For example, robots are now used to defuse bombs, service and clean nuclear reactors,
investigate the depths of the ocean and the far reaches of space. Quasi-autonomous unmanned aerial
vehicles are now undertaking many of the militarys most dangerous reconnaissance and strike
missions. The MQ-1 Predator is a medium-altitude, long-endurance, remotely piloted aircraft. The
MQ-1s primary mission is interdiction and conducting armed reconnaissance against critical, timesensitive targets. The RQ-4 Global Hawk flies at altitudes up to 65,000 feet for up to 35 hours at speeds
approaching 340 knots. It can image an area the size of the state of Illinois in just one mission. The
National Aeronautics and Space Administration (NASA) and corporate entities are working on
autonomous machines to transport materials and provide robotic aerial refueling of aircraft.

What Is Robotics?

Robots and NASA

Some of the most dangerous and challenging environments are found beyond the Earth. For decades,
NASA has utilized probes, landers, and rovers with robotic characteristics to study outer space and
planets in our solar system.

Sojourner sampling a large rock formation on the Martian

surface. (Image courtesy of NASA)

Pathfinder and Sojourner

The Mars Pathfinder mission developed a unique technology that allowed the delivery of an
instrumented lander and a robotic rover, Sojourner, to the surface of Mars. It was the first robotic
roving vehicle to be sent to the planet Mars. Sojourner weighs 11.0 kg (24.3 lbs.) on Earth (about 9 lbs.
on Mars) and is about the size of a childs wagon. It has six wheels and could move at speeds up to 0.6
meters (1.9 feet) per minute. Pathfinder not only accomplished this goal but also returned an
unprecedented amount of data and outlived its primary design life.

Computer-generated rendering of a Mars Exploration Rover (MER).

(NASA image)

Unit 1: Introduction to VEX and Robotics

Spirit and Opportunity

The Mars Exploration Rovers (MERs), Spirit and Opportunity, were sent to Mars in 2003 and landed
there in early 2004. Their mission was to search for and characterize a wide range of rocks and soils
that hold clues to past water activity on Mars in hopes that a manned mission may someday follow.
Both rovers are still operating, far surpassing their 90-day warranty period.

On space shuttle mission STS-41B, February 1984, the Canadarm was

used as a platform for spacewalk work by astronauts Bruce McCandless
II (pictured) and Robert L. Stewart. (NASA image)

Space Shuttle Robotic Arm

When NASA scientists first began the design for the space shuttle, they realized that there would have
to be some way to get the enormous, but fortunately weightless, cargo and equipment into space
safely and efficiently. The remote manipulator system (RMS), or Canadarm, made its first flight into
space on November 13, 1981.
The arm has six joints. Two are in the shoulder, one is at the elbow, and three in the highly dextrous
wrist. In the weightless environment of space, it can lift more than 586,000 pounds and place it with
incredible accuracy.

What Is Robotics?

The RMS has been used to launch and rescue satellites and has proven itself invaluable in helping
astronauts repair the Hubble Space Telescope.

An unprecedented handshake in space occurred on April 28, 2001,

as the Canadian-built space station robotic arm, also referred to as
Canadarm2, transferred its launch cradle over to Endeavours
Canadian-built robotic arm. (NASA image)

The International Space Station

In the 25 years since the RMSs first flight, it has been joined by a new more advanced design that
resides on the International Space Station. Canadarm2 works in tandem with its cousin on nearly every
shuttle flight to help build the space station by passing school-bus-sized modules between them and
placing them for the astronauts to assemble.

Computer rendering of the Special Purpose Dexterous Manipulator, or

Dextre. (NASA inage)

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Unit 1: Introduction to VEX and Robotics

Dextre
As part of the Space Shuttle mission STS-123 in 2008, the shuttle Endeavour carried the final part of
the Special Purpose Dexterous Manipulator, or Dextre.
Dextre is a robot with two smaller arms. It is capable of handling the delicate assembly tasks currently
performed by astronauts during spacewalks. Dextre can transport objects, use tools, and install and
remove equipment on the space station. Dextre also is equipped with lights, video equipment, a tool
platform, and four tool holders. Sensors enable the robot to feel the objects it is dealing with and
automatically react to movements or changes. Four mounted cameras enable the crew to observe
what is going on.
Dextres design somewhat resembles a person. The robot has an upper body that can turn at the waist
and shoulders that support arms on either side. (NASA)

Astronaut spacewalk helper the Robonaut.

(NASA image)

Robonaut
Robonaut is a humanoid robot designed by the Robot Systems Technology Branch at NASAs Johnson
Space Center (JSC) in a collaborative effort with DARPA. The Robonaut project seeks to develop and
demonstrate a robotic system that can function as an Extravehicular Activity (EVA) astronaut
equivalent.
The challenge is to build machines that can help humans work and explore in space. Working side by
side with humans, or going where the risks are too great for people, machines like Robonaut will
expand our ability for construction and discovery. (NASA)

What Is Robotics?

11

Robots in the Future: Nanotechnology

Nanotechnology is molecular manufacturing or, more simply, building things one atom or molecule
at a time with programmed nanoscopic robot arms. A nanometer is one billionth of a meter (3 to 4
atoms wide). The trick is to manipulate atoms individually and place them exactly where needed to
produce the desired structure. This ability is almost in our grasp.

Computer designed robotic hand to reproduce

human movement. (Autodesk image)

Robotics in Our Future?

During the Industrial Revolution, humans used their increasing skill to build machines that were
essentially larger, stronger, and improved models of human design to do the work of many. In the
modern age, these machines are still being constructed, but now a new type of machine has evolved
that more closely resembles the human nervous system. Recently, these concepts of copying human
design and control were merged, ushering in the era of bionics and cybernetics.
The field of cybernetics, derived from the Greek word for steersman (kybernetes), was first developed
in the 1940s. It can best be described as the science of communication and control in an animal or a
machine. Bionics is merging these devices with living beings to replace or supplement organs or limbs
lost to accident or disease.

Robotics in Education
The field of robotics is quickly becoming an exciting and accessible tool for teaching and supporting
science, technology, engineering, mathematics (STEM), design principles, and problem solving.
Robotics enables students to use their hands and minds to create like an engineer, artist, and
technician does, all at once.
In todays education system with its budgetary constraints, middle and high schools are on a constant
search for cost-effective exciting ways to deliver high-impact programs that integrate technology
with multiple disciplines while preparing students for careers in the twenty-first century. Educators
quickly see the advantages that robotics projects and curriculum provide to link in a cross-curriculum
method with other disciplines. Additionally, robotics can provide more affordability and reusability of
equipment as compared to other prepackaged options.

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Unit 1: Introduction to VEX and Robotics

Today, more than ever, schools are adopting robotics in the classroom to revitalize curriculum and
meet ever increasing academic standards required for students. Robotics not only has a unique and
broad appeal throughout various teaching fields, but it is, quite possibly, the technical field that will
have the largest influence upon our society throughout the next century.

Robotics gather racquetballs to score at a student robotics event.

(Image from Daniel Ward II)

Introduction to Competitive Robotics

The true test of a robots abilities is to challenge others in a competitive environment. There is no
better way to evaluate design parameters, sturdiness of construction, and student ability than a welldesigned competition. This scenario is very realistic; large projects in industry that require tremendous
investment such as a building, military vehicle, or aircraft, are often put head-to-head in order to select
the winner that gets the work.
Robotics competition is designed to provide students of all ages, backgrounds, and levels of study
with the opportunity to demonstrate their knowledge and understanding of design, manufacturing
processes, materials, programming, and other technologies. Students are judged on their application
of technology principles to solve the challenge, knowledge of engineering concepts that aid them in
solving the problem, and their ability to solve real-world problems in a team environment as they
work together to overcome their opponents, all while having fun.

What Is Robotics?

13

Introduction to VEX

VEX Robotics Design System

In the relatively short history of hobbyist robotic kits in the commercial market, a wide chasm has
existed between the Lego Mindstorms, marketed primarily to young children, and the far more
complex, high-end machines offered by other companies.
Innovation First, Inc. and their VEX Robotics Design System, bridges that gap with a robust, and
challenging robot kit for students in the middle school environment. In fact, this well-machined,
reasonably-priced kit succeeds as a helpful introduction to technology for students of any age.

VEX Classroom Lab Kit

VEX Classroom Lab Kit

IFIs VEX EDR Robotics Design System is a leading classroom robotics platform designed to nurture
creative advancement in robotics and knowledge of science, technology, engineering, and math
(STEM) education. The VEX EDR system provides teachers and students with an affordable, robust, and
state-of-the-art robotics system suitable for classroom use and the playing field. VEXs innovative use
of premanufactured and easily formed structural metal, combined with a powerful and userprogrammable microprocessor for control, leads to infinite design possibilities.

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Unit 1: Introduction to VEX and Robotics

Whats in the VEX Classroom Lab Kit?

VEX Parts Details
VEX Robotics Design System
The VEX Classroom Lab Kit consists of rugged reusable metal and plastic parts designed for durability.
The entire kit can be assembled with the basic hand tools included. Some designs may require cutting
of structural parts, which can be accomplished by using a cutoff tool or snips. Always keep safety in
mind and wear safety glasses when using tools or running the robot.

Whats in the VEX Classroom Lab Kit

This list below details what parts are included in the VEX Classroom Lab Kit, their assigned part
quantities and VEX part abbreviations. Refer to the Working with VEX Parts section for more
information on each subsystem and their uses.
Part

Part Description/
Quantity

Part
Abbreviation

VEX Transmitter
Quantity: 1

VEX Microcontroller

VMC

Quantity: 1

Whats in the VEX Classroom Lab Kit?

15

Part

Part Description/
Quantity

Part
Abbreviation

VEX Receiver Module

RX75

Quantity: 1

VEX Motor Module

MOT

Quantity: 4

VEX Servo Module

Quantity: 1

VEX 7.2-Volt battery Box

Quantity: 1

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Unit 1: Introduction to VEX and Robotics

SRV

Part

Part Description/
Quantity

Part
Abbreviation

Battery Strap

BST

Quantity: 2

Jumper Pins

JMP

Quantity: 3

Antenna Tube

AT

Quantity: 1

Antenna Holder

AH

Quantity: 1

Zip Tie

ZIP

Quantity: 100

Whats in the VEX Classroom Lab Kit?

17

Part

Part Description/
Quantity

Part
Abbreviation

VEX Limit Switch

SWL

Quantity: 2

VEX Bumper Switch

Quantity: 2

6" PWM Extension Cable

Quantity: 2

12", 24", and 36" PWM Extension

Cables
Quantity:
2 12" PWM Extension Cables
1 24" PWM Extension Cable
1 36" PWM Extension Cable
PWM Y-Cable
Quantity: 2

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Unit 1: Introduction to VEX and Robotics

SWB

Part

Part Description/
Quantity

Part
Abbreviation

Rough Terrain Wheel

W5

Quantity: 4

All Purpose Wheel

W4

Quantity: 4

Low Friction Wheel

W2.8

Quantity: 4

Intake Roller

ROL

Quantity: 2

Whats in the VEX Classroom Lab Kit?

19

Part

Part Description/
Quantity

Part
Abbreviation

84-Tooth Gear

G84

Quantity: 4

60-Tooth Gear

G60

Quantity: 10

36-Tooth Gear

G36

Quantity: 8

12-Tooth Gear
Quantity: 8

20

Unit 1: Introduction to VEX and Robotics

G12

Part

Part Description/
Quantity

Part
Abbreviation

19 -Tooth Rack (Drive Gear shown)

GR19

Quantity: 4

Drive Shaft, Square-Bar 2"

SQ2

Quantity: 8

Drive Shaft, Square-Bar 3"

SQ3

Quantity: 10

Square-Bar 4"

SQ4

Quantity: 3

Shaft 12"

SQ12

Quantity: 2

Whats in the VEX Classroom Lab Kit?

21

Part

Part Description/
Quantity

Part
Abbreviation

Shaft Collar

COL

Quantity: 37

Thick Spacer

SP2

Quantity: 21

Thin Spacer

SP1

Quantity: 31

Bearing Flat

BF

Quantity: 36

Bearing Block
Quantity: 6

22

Unit 1: Introduction to VEX and Robotics

BB

Part

Part Description/
Quantity

Part
Abbreviation

Shaft Lock Bars

LB

Quantity: 6

Bar Lock Quantity: 0

Plastic and Steel Washers

WP & WS

Quantities:
10 Plastic
10 Steel

Clutch Post

MCL

Quantity: 4

Motor Screw, Short (1/4")

SS2

Quantity: 21

Motor Screw, Long (1/2")

SS4

Quantity: 18

Whats in the VEX Classroom Lab Kit?

23

Part

Part Description/
Quantity

Part
Abbreviation

Screw #8-32 x 1/4" Long

S2

Quantity: 120

Screw #8-32 x 3/8" Long

S3

Quantity: 43

Screw #8-32 x 1/2" Long

S4

Quantity: 38

Screw #8-32 x 3/4" Long

S6

Quantity: 16

Keps Nuts

NK

Quantity-96

Nylock Nuts

NL

Quantity: 14

Plastic Bearing Rivets

Quantity: 100

24

Unit 1: Introduction to VEX and Robotics

BR

Part

Part Description/
Quantity

Part
Abbreviation

Threaded Beams, 1/2", 1", 2", 3"

B0.5,
B1,
B2,
B3

Quantities:
14 1/2"
12 1"
8 2"
8 3"

Chassis Bumper (2x2x15)

A15

Quantity: 2

Chassis Rail (15 Hole)

R15

Quantity: 4

Chassis Bumper (2x2x25)

A25

Quantity: 2

Chassis Rail (25-Hole)

R25

Quantity: 4

Angle Bars (mirror images of

each other)

AS30 & AS30R

Quantity: 2 of each

Whats in the VEX Classroom Lab Kit?

25

Part

Part Description/
Quantity

Part
Abbreviation

Angle Bar (1x1x 25)

AR25

Quantity: 2

25 Hole Bar

B25

Quantity: 10

Plate 5x5

P5

Quantity: 2

Plate 5x15

P15

Quantity: 3

Plate 5x25
Quantity: 2

26

Unit 1: Introduction to VEX and Robotics

P25

Part

Part Description/
Quantity

Part
Abbreviation

C-Channel 1x2x1x15

C15

Quantity: 4

C-Channel 1x2x1x25

C25

Quantity: 3

C-Channel 1x5x1x25

CW25

Quantity: 3

Pivot Gusset

GP

Quantity: 4

Whats in the VEX Classroom Lab Kit?

27

Part

Part Description/
Quantity

Part
Abbreviation

Angle Gusset

GA

Quantity: 4

Plus Gusset

G+

Quantity: 4

Tank Tread Kit

Quantities:
4 Tank Tread Double Bogie Wheels
2 Tank Tread Single Bogie Wheels
170 Tank Tread Links
4 Tank Tread Sprockets
12 Screws, #8-32 x 1" Long
12 Keps Nuts

Chain and Sprocket Kit

Quantities:
326 Chain Links
2 10 Tooth Sprockets
4 15 Tooth Sprockets
4 24 Tooth Sprockets
2 40 Tooth Sprockets
2 48 Tooth Sprockets

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Unit 1: Introduction to VEX and Robotics

TDB,
TSB,
TL,
TS15,
S8,
NK

CL,
CS10,
CS15,
CS24,
CS40,
CS48

Part

Part Description/
Quantity

Part
Abbreviation

Nut Starter
Quantity: 1

Allen Wrenches 3/32" and 5/64"

Quantity: 1 of each

Open-Ended Wrench
Quantity: 1

Safety Glasses
Quantity: 4

Programming Cable
Quantity: 1

Whats in the VEX Classroom Lab Kit?

29

Part

Part Description/
Quantity

Part
Abbreviation

Power Pack
Quantities:
1 7.2 Volt Robot Battery
1 9.6 Volt Transmitter Battery
1 7.2 Volt Wall Charger
1 9.6 Volt Wall Charger

Advanced Gear Kit

Quantities:
7 Bevel Gears
1 Differential Gear Housing
8 Rack Gears
4 Worm Wheels
4 Worm Gears
2 12 Tooth Gears
16 Motor Screws, Short (1/4")

30

Unit 1: Introduction to VEX and Robotics

BG24,
GR19,
GW24,
GW,
DG36

Working with VEX Parts

VEX Robotics Design System

VEX Classroom Lab Kit

The VEX Robotics Design System is divided up into several different Subsystems:

Structure Subsystem
Motion Subsystem
Power Subsystem
Sensor Subsystem
Logic Subsystem
Control Subsystem

Every VEX component falls into one of these categories. Refer to the VEX Inventors Guide for more
information on each Subsystem, their uses, and their interactions with other Subsystems. The
Inventors Guide will provide users of all levels with instruction and background to begin their journey
with VEX Robotics. It also provides a reference which advanced users can refer back to.

Structure Subsystem
Part

Part Description
Square Bars come in an assortment of lengths and
have a variety of uses. Their primary use is axles.
The motors and servos are designed to receive the
square stock for transfer of motion. They may also
be used as structural pieces and can be reshaped
(bent) into many different shapes.

Working with VEX Parts

31

Part

Part Description
Shaft collars are used to hold components in place
axially on a shaft. Combined with spacers, they
allow for the precise axial positioning of gears and
other components in the VEX Motion Subsystem.
They can also be used to retain shafts in location
axially (keep them from sliding in and out).

Spacers are used to offset components and to

position components on a shaft. Two thicknesses
are provided.

Bearing Flats attach to structural components to

provide a smooth, low-friction surface for a
rotating shaft.

Bearing Blocks can support shafts or act as guides

for ropes or cables.

Lock Plates fix a shaft to a structural element so that

both components rotate together.

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Unit 1: Introduction to VEX and Robotics

Part

Part Description
Washers are used to distribute the load from the
bolt head or nut. Washers are also used as spacers
and to reduce friction between rotating
components. Both plastic and steel washers are
included.

Clutch Posts are used to join a clutch to a motor

or servo.

Screws are used to fasten structural elements and

other components together.

Keps Nut A nut with an attached conical, toothed,

lock washer. When you tighten the nut, the washer
flattens slightly and the teeth dig in to the adjacent
surface, reducing the chance of the nut loosening
from the bolt.
Nylock Nut A nut with a nylon insert that is
slightly smaller than the threaded portion. When
you tighten the nut, the nylon grips the bolt tightly,
reducing the chance of the nut loosening from the
bolt under vibration.

Working with VEX Parts

33

Part

Part Description
Plastic Bearing Pop-Rivets are used to fasten
bearings onto structural elements.

Threaded Beams are used to separate components.

They are available in four lengths.

Chassis Bumper 15-hole

Chassis Rail 15-hole

Chassis Bumper 25-Hole

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Unit 1: Introduction to VEX and Robotics

Part

Part Description
Chassis Rail-25-Hole

Angle Bars (mirror images of each other)

Angle Bar 1x1x 25-Hole

25-Hole Bar

Plate 5x5

Plate 5x15

Working with VEX Parts

35

Part

Part Description
Plate 5x25

C-Channel 1x2x1x15

C-Channel 1x2x1x25

C-Channel 1x5x1x25

Pivot Gusset Used to join structural elements at

angles other than 90 degrees or where one
element rotates with respect to the other.

36

Unit 1: Introduction to VEX and Robotics

Part

Part Description
Angle Gusset Used to join structural elements at
90 degrees.

Plus Gusset Used to join structural elements at

90 degrees in a cross formation.

Motion Subsystem
Part

Part Description
The VEX Motor Module with Clutch and VEX Servo
Module with Clutch, while similar in appearance,
are suited to distinctly different types of tasks.
Regular motors should be used whenever
continuous rotation is needed, such as in a robots
main drive system.

Servomotors can only be used in cases where the

boundaries of motion are well defined, but have
the invaluable ability to self-correct to maintain
any specific position within those boundaries. Be
sure to check the text on the green back to make
sure you have the right module.

Working with VEX Parts

37

Part

Part Description
PWM Extensions allow distant positioning of
motors, servos, and sensors. Available in three
lengths.

PWM Y-Cable allows for the running of two motors

or servos from one output.

Knobby Wheels can be used for locomotion and

feeder applications. The material is hard so best
traction will occur in soft materials like dirt or heavy
carpet. Their large diameter provides maximum
clearance over obstacles.

The All Purpose Wheel is also used for locomotion

and feeder applications. Due to its flat profile and
tread, the best surfaces to use it on are flat with
high friction.

The Low Friction Wheel is the most versatile wheel

in the kit. Its soft rubber tread provides maximum
traction on a variety of smooth surfaces and lowpile carpets. Its tread may also be removed to
expose a smooth low-friction surface that will
enable the wheel to slide when force is applied to
the side of the wheel. Be sure to match up the
arrows on the hub and tread when reinstalling
the treads.

38

Unit 1: Introduction to VEX and Robotics

Part

Part Description
Intake Rollers are typically used to pull in balls or
other objects. They are very pliable and provide
enough friction to firmly hold objects.

Gears (various sizes) are used to transmit power

and motion from a motor or servo to a driven
component. Gears are often used to increase
torque or change the speed.

A Rack is used with a gear (as shown) to turn

rotational motion into straight-line motion.

Working with VEX Parts

39

Part

Part Description
Tank Tread Kit is used to add a tank tread drive to
a robot.

Chain and Sprocket Kit is used to transmit motion

and power over a greater distance than with gears.

Zip Ties are one of the more useful items in the kit.
They may be used to fasten nearly any parts
together, but their primary use is to secure loose
cables to structure components. They are also
commonly used in sweeping collection
mechanisms.

Power Subsystem
Part

Part Description
The 7.2-Volt battery Box is for AA batteries when
you do not have access to a 7.2 Ni-H battery. It is
recommended that you invest in rechargeables.

40

Unit 1: Introduction to VEX and Robotics

Part

Part Description
The Battery Strap is used to secure the 7.2-volt
battery to the robot frame.

The Vex Power Pack contains the Vex 7.2 Volt

Battery for the robot, the Vex 9.6 Volt Battery for
the transmitter, and a wall charger for each
battery.

Sensor Subsystem
Part

Part Description
Limit Switches can be used to cut power to motors
when depressed and enable power to pass when
released. They are either on or off. These are
frequently used when a design calls for movement
to stop.

Bumper Switches are similar to limit switches in

operation. They are typically used to detect when a
robot has made contact with an obstacle.

Working with VEX Parts

41

Logic Subsystem
Part

Part Description
The Vex Robotics Programming Kit is a
combination of hardware and software that enable
you to write programs on your computer and
download them to the robots microcontroller. You
use the Vex programming cable to connect your
computers USB port to the serial port located on
the back of the microcontroller.
The VEX Microcontroller has eight motor (output)
ports, six interrupt ports, two 100 mA open
collector outputs, and sixteen I/O sensor ports. It is
possible to load custom programming through the
serial port located on the back of the box with a
USB to serial convertor. There are also two receiver
or tether ports for connecting up to two receiver
modules for two-transmitter control.

Control Subsystem
Part

Part Description
The VEX Robotics Transmitter accepts different
frequency crystals to allow for operation of
multiple robots simultaneously. It also has options
for trim and scaling of its 6 channels.

The Receiver Module can accept different receiver

crystals to receive signasl from the matching
transmitter crystal and pass those signals along
to the VEX Micro-Controller.

42

Unit 1: Introduction to VEX and Robotics

Part

Part Description
The Antenna Tube is used to hold the antenna wire
in order to receive the maximum signal from the
transmitter. This is especially important if running
the robot at a distance.
The Antenna Base holds the Antenna Tube and
enables it to be mounted to the frame.

Working with VEX Parts

43

Getting Started with Autodesk Inventor

Overview
This lesson describes the application interface. You are introduced to the different file types (part,
assembly, presentation, and drawing) you work with as you create and document your designs, and
you examine the common user interface elements and view management tools in these
environments.

Objectives
After completing this lesson, you will be able to:

44

Review the modeling process in Autodesk Inventor.

Identify the major components of the Autodesk Inventor user interface.
Identify the tools that are available in the graphics window.
Explore the user interface using the view navigation tools.

Unit 1: Introduction to VEX and Robotics

The Modeling Process with Autodesk Inventor

You can use a modeling tool like Autodesk Inventor through most of the design process. Whether you
want to try out some ideas, test a design, or create the final model, Autodesk Inventor contains the
tools you require. The basic modeling process in Autodesk Inventor consists of the following steps:
1. Create one or more parts.
2. Assemble the parts.
3. Document the parts and assemblies.
The following discussion explores the modeling process in Autodesk Inventor showing you how two
different parts of a scooter are created.

Create Parts
To create a part, you start by drawing a two-dimensional shape called a sketch. A typical sketch
consists of lines, arcs, and circles.

Getting Started with Autodesk Inventor

45

You make the shape the right size using dimensions.

You then turn the two-dimensional sketch into a three-dimensional (3D) model. In this example, the
parts were extruded to create the 3D model. You use other methods such as revolve, sweep, or loft to
create other shapes.

46

Unit 1: Introduction to VEX and Robotics

To complete the part, you add more features such as slots, cutouts, and holes. You can round over
edges (rounds are called fillets) and change the material and color to match the real part.

You can even test the parts in Autodesk Inventor before you build them to see how the parts deform
and if they will be strong enough. You might have to make the part stronger in some areas but you
can also save weight and material by identifying areas where the part is stronger than it needs to be.

Getting Started with Autodesk Inventor

47

Assemble Parts
After you create the parts, you join them together into an assembly. You do not have to create all of
the parts before you start assembling them. Some parts are easier to design once you have the
basic model.

Many common parts that you would purchase rather than make, such as bolts, nuts, and screws, are
supplied with Autodesk Inventor. You can add these to the model without having to make them
yourself.

Now that you have a complete, virtual model of the real object, you can view the model from different
directions and with different materials and lighting to see if it looks good.

48

Unit 1: Introduction to VEX and Robotics

You can determine how much it weighs, how much material it uses, and how much it will cost to make.
You can test the assembly to see if it functions correctly before you build it. Do the parts move
correctly? How much force is required to move the parts? The following image shows the results of
simulating the motion of a concrete breaker.

Document the Design

When you are satisfied that your design looks and performs correctly, it is time to make it (or have
someone else make it). You create drawings of each part so the parts are made to the correct size
and shape.

Getting Started with Autodesk Inventor

49

You also create drawings to show how to assemble the parts.

You can use the rendered images that you created from your virtual model for marketing your design
before it is even made.

Other documentation might include assembly manuals and maintenance manuals. It is easy to
generate the images for these manuals from your virtual model. You can even create black and white
images that look like technical illustrations.

You have now seen how Autodesk Inventor can be used throughout the modeling process.

50

Unit 1: Introduction to VEX and Robotics

Menus and Toolbars

As you design and document parts in Autodesk Inventor, you change back and forth between several
environments such as part modeling, assembly, drawing, and presentations. All environments share a
common layout for menus and a single toolbar across the top of the application window. Each
environment displays menu items and tools specific to that environment. As you change tasks within
a single environment, menus and the toolbars adjust to present the appropriate tools.
The major components of the Autodesk Inventor user interface are as shown. Menus and toolbars are
displayed at the top of the application window.

Menu
Toolbar
ViewCube
Graphics window
Panel bar
Browser
3D Indicator
SteeringWheels

Getting Started with Autodesk Inventor

51

Menu Structure
Autodesk Inventor uses the standard menu structure common in all Microsoft Windows applications.
The menu structure is context-sensitive based on the environment and mode you are using.
As you learn the application more thoroughly, you should take the time to familiarize yourself with the
different options displayed on the menu while working in different environments.
The Insert menu in the part modeling environment is as shown.

The Insert menu in the assembly modeling environment is as shown.

The Insert menu in the drawing environment is as shown.

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Unit 1: Introduction to VEX and Robotics

Toolbars
By default, a single Inventor Standard toolbar is displayed in all environments. When you change
between environments, the toolbar updates to display valid tools for the environment. The toolbar
contains tools for file handling, settings, view manipulation, and model or document appearance.

Overview of the Standard Toolbar

A section of the Inventor Standard toolbar is shown. It is organized into groups based on functionality.
This area of the toolbar displays tools for standard file and modeling operations.

Standard file management tools

Undo and redo
Selection filters
Environment navigation
Update document

About the Graphics Window

Your 3D part and assembly models, presentations, and drawings are displayed in the graphics
window. Many tools are available to manipulate the view and appearance of your model in the
graphics window.

Getting Started with Autodesk Inventor

53

View Manipulation Tools

View manipulation is a key 3D modeling skill. You are often required to view different areas of a model,
and changing your view can help you visualize solutions for the current task. Most of the view
manipulation tools are common to all environments.
The view manipulation tools on the Inventor Standard toolbar are as shown.

Zoom All
Zoom Window
Dynamic Zoom
Pan
Zoom to Selection
Orbit
Look At Reorients the view normal to the current selection
ViewCube Provides a persistent, clickable interface where you can switch between standard
and isometric views.
SteeringWheels Saves you time by combining many of the common navigation tools into
a single interface.

You can use the mouse to accomplish most pan and zoom tasks.

54

Roll the mouse wheel to zoom at the cursor location.

Click and hold the mouse wheel then move the mouse to pan.
Double-click the mouse wheel to zoom all.

Unit 1: Introduction to VEX and Robotics

Dynamic View Rotation

The Orbit tool enables you to dynamically change your view of the model. It is important to remember
that the model does not move; you change your viewing position with the Orbit tool.
The rotation modes available are outlined as shown. The cursor provides feedback on the rotation
mode available. You click and drag to rotate the view. You can set the center of rotation by clicking a
location on the model.

Click and drag here to rotate the view about all axes.
Click and drag here to rotate the view about a vertical axis.
Click and drag here to rotate the view about a horizontal axis.
Click and drag here to rotate the view about an axis normal to the screen.
Position and click here to exit.

Getting Started with Autodesk Inventor

55

ViewCube Rotation
ViewCube rotation mode enables you to view the model from common directions, including top,
bottom, front, back, right, left, or any isometric view in between.

56

Click Top

Resulting view

Click an edge

Resulting view

Click Home

Resulting view

Unit 1: Introduction to VEX and Robotics

In all modeling environments you can quickly return to a default isometric view using either of the
following methods:

On the ViewCube, click Home.

Right-click in the graphics window background. Click Home View.
Press the F6 function key.

Display Modes
This area of the toolbar displays appearance-related tools for controlling the appearance of your
model. Select a render style from the list to change the color and texture of your model.

3D Indicator
While using the assembly, part modeling, and presentation environments, the 3D Indicator is
displayed in the lower-left area of the graphics window. The indicator displays your current view
orientation in relation to the X, Y, and Z axes of the coordinate system.

The 3D Indicator is positioned below and to the left of the assembly as shown.

Red X-axis
Green Y-axis
Blue Z-axis

Getting Started with Autodesk Inventor

57

Exercise: Use the View Navigation Tools

In this exercise, you open an assembly and explore
the view navigation tools. You also examine the
relationship between the objects in the browser
and graphics window. The view navigation tools are
common to all environments.

6.

Open MicroController View.iam. Your view

should be as shown.

7.

On the ViewCube, click Home.

The view is reoriented as shown.

The completed exercise

Use the ViewCube

In this exercise, you open an assembly and explore
the view navigation tools. You also examine the
relationship between the objects in the browser and
graphics window. The view navigation tools are
common to all environments.
1.

8.

On the ViewCube, click Front.

Start Autodesk Inventor.

NOTE: If you are already in Autodesk Inventor,
close all files.

2.

If the Open dialog box is displayed, click

Projects. Otherwise, click File menu >
Projects.

3.

Click Browse. Navigate to the Unit1 folder.

4.

Select IFI_Unit1.ipj. Click Open.

5.

Click Done to close the dialog box.

58

Unit 1: Introduction to VEX and Robotics

The view is reoriented as shown.

9.

Right-click the background in the graphics

window. Click Home View.
The view is reoriented as shown.

10.

In the graphics window, move the cursor near

the center of the model. Roll the mouse
wheel away from you.

11.

Roll the mouse wheel toward you until the

model fills the screen.

12.

Hold down the mouse wheel and drag the

mouse.

Use the Viewing Tools

In this section of the exercise, you rotate the
microcontroller assembly and redefine the default
Home view.
1.

On the Standard toolbar, click Look At.

2.

Select the face of the microcontroller as

shown.

The view rotates normal to the selected face.

The view pans to match the movement of the

mouse.
13.

Release the mouse wheel. Press F6.

The view is reoriented to the default Home
view.

3.

Press F5. The previous view is restored. It

should be the default Home view.

4.

On the Standard toolbar, click Orbit.

5.

Move the cursor over the handle at the

bottom of the 3D Rotate symbol.

Click and drag upward to rotate the view

about the horizontal axis.
Release the mouse button.

Getting Started with Autodesk Inventor

59

The first image shows the isometric view, and

the second image shows the rotated view.

6.

8.

Drag down and to the left. The view rotates

about the center of the 3D Rotate symbol to
match the movement of the cursor.

9.

Press F6 to view the model as the Home view.

10.

On the ViewCube, click the top-right corner.

Click the handle at the left side of the 3D

Rotate symbol. Drag to the right to rotate the
view about the vertical axis.

The view is reoriented as shown.

11.

7.

Click inside the 3D Rotate symbol near the

location as shown.

Change the Display

In this section of the exercise, you change the display
of the assembly.
1.

60

Unit 1: Introduction to VEX and Robotics

Right-click the ViewCube. Click

Set Current View as Home > Fixed Distance.

On the Standard toolbar, Display Mode

flyout, click Wireframe Display.

The view changes to a wireframe view.

2.

6.

In the browser, move the cursor over

MICROCONTROLLER-TOP. The part is
highlighted in the graphics window.

7.

In the browser, right-click

MICROCONTROLLER-TOP. Click Visibility to
turn off visibility. The check mark next to the
option is cleared.

On the Standard toolbar, Display Mode

flyout, click Shaded Display.

The part is no longer visible in the graphics

window.
The model returns to a shaded display.
3.

On the Standard toolbar, View Mode flyout,

click Perspective.

8.

On the Standard toolbar, click Undo.

The view changes to a perspective view.

The MICROCONTROLLER-TOP part is visible in

the graphics window.
9.

4.

With the perspective camera active, use the

Orbit, Pan, and Zoom tools to reorient your
view.

5.

Press F6 to return to the Home view.

Close MicroController View.iam. Do not save

changes.

Getting Started with Autodesk Inventor

61

Build Phase
Overview
This phase describes the steps for building a VEX Tumbler robot.

The Vex Tumbler Robot

Phase Objectives
After completing this phase, you will be able to:

Identify and use the different parts of the VEX Classroom Kit.
Identify and use VEX parts to complete subassemblies in the creation of the Tumbler robot.
Assemble and drive a VEX Tumbler robot.

Prerequisites and Resources

Related phase resources are:

62

Introduction to VEX and Robotics.

Unit 1: Introduction to VEX and Robotics

Required Supplies and Software

The following supplies are used in this phase:
Supplies
VEX Classroom Lab Kit
Work surface
Small storage container for loose parts

VEX Parts
The following VEX parts are used in this phase:
Quantity

Part Number

Abbreviations

ANTENNA HOLDER

AH

ANTENNA TUBE

AT

7.2 VOLT RECHARGEABLE BATTERY

BP

BATTERY-STRAP

BST

BEAM-1000

B1

BEARING-FLAT

BF

BEARING-RIVET

BR

CHASSIS BUMPER, 15 HOLE

A15

CHASSIS RAIL, 15 HOLE

R15

JUMPER

JMP

ROUGH TERRAIN WHEEL

W5

MICROCONTROLLER

VMC

25

NUT-832-KEPS

NK

PLATE, 5x15 HOLE

P15

RECEIVER

RX75

SCREW-632-0250

SS2

24

SCREW-832-0250

S2

SCREW-832-0375

S3

SHAFT-3000

SQ3

SHAFT COLLAR

COL

SPACER-THIN

SP1

VEX MOTOR with CLUTCH

MOT

Build Phase

63

Activity
In this activity, you build a complete robot called Tumbler.
You start by building the right-side drive train.
1.

To complete the first step:

Locate one Chassis Rail [R15].

Fasten two Bearing Flats [BF] to the Chassis Rail using two Bearing Rivets [BR]
for each Bearing Flat.
Fasten two 1" Beams [B1] to the Chassis Rail using #8-32 x 1/4" screws [S2].

The completed model is as shown:

64

Unit 1: Introduction to VEX and Robotics

2.

To complete the next step:

Locate an additional Chassis Rail [R15] from the kit.

Fasten two motors [MOT] to the Chassis Rail using two #6-32 x 1/4" screws [SS2] per motor.
Make sure the motors are oriented correctly.

The completed model is as shown:

Build Phase

65

3.

To complete the next step:

Orient the two assemblies and connect them by inserting #8-32 x 1/4" Screws [S2] into the
end of the Beams.
Insert a 3" Shaft [SQ3] into each motor, adding a Collar [COL] to the shaft as you insert it
through the two rails.
When you have seated the shaft into the motor, slide the collar against the Bearing Flat and
tighten. The collar prevents the shaft from coming out of the motor.

The completed model is as shown:

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Unit 1: Introduction to VEX and Robotics

4.

To complete the next step:

Slide a Thin Spacer [SP1] onto each shaft.

Slide a Rough Terrain Wheel [W5] onto each shaft.
Slide Shaft Collars [COL] up against the wheels and tighten.

The completed model is as shown:

Build Phase

67

68

5.

The right-side drive train is complete!

Unit 1: Introduction to VEX and Robotics

Assemble the Left Side Drive

You now build the left side of the drive train.
1.

To complete the first step:

Locate one Chassis Rail [R15].

Fasten two Bearing Flats [BF] to the Chassis Rail using two Bearing Rivets [BR]
for each Bearing Flat.
Fasten two 1" Beams [B1] to the Chassis Rail using #8-32 x 1/4" screws [S2].

The completed model is as shown:

Build Phase

69

2.

To complete the next step:

Locate an additional Chassis Rail [R15] from the kit.

Fasten two motors [MOT] to the Chassis Rail using two #6-32 x 1/4" screws [SS2] per motor.
Make sure the motors are oriented correctly.

The completed model is as shown:

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Unit 1: Introduction to VEX and Robotics

3.

To complete the next step:

Orient the two assemblies and connect them by inserting #8-32 x 1/4" Screws [S2] into the
end of the Beams.
Insert a 3" Shaft [SQ3] into each motor, adding a Collar [COL] to the shaft as you insert it
through the two rails.
When you have seated the shaft into the motor, slide the collar against the Bearing Flat and
tighten. The collar prevents the shaft from coming out of the motor.

The completed model is as shown:

Build Phase

71

4.

To complete the next step:

Slide a Thin Spacer [SP1] onto each shaft.

Slide a Rough Terrain Wheel [W5] onto each shaft.
Slide Shaft Collars [COL] up against the wheels and tighten.

The completed model is as shown:

72

Unit 1: Introduction to VEX and Robotics

5.

The left side drive train is complete!

Build Phase

73

Assemble the Base

You now assemble the base then add the receiver, controller, battery, and antenna.
1.

To complete the first step:

Bolt a Chassis Bumper [A15] to one end of the right side drive assembly using three #8-32
x 1/4" screws [S2] and corresponding Keps Nuts [NK] for each joint. The Nut Starter might
be useful to help start the nuts on the screws.
Add a second Chassis Bumper as shown.

The completed model is as shown:

74

Unit 1: Introduction to VEX and Robotics

2.

Attach the left side drive assembly using the same procedure as the previous step.

The completed model is as shown:

Build Phase

75

3.

Attach a Plate 5x15 [P15] to the top of the chassis using #8-32 x 1/4" screws [S2]
and Keps Nuts [NK].

The completed model is as shown:

76

Unit 1: Introduction to VEX and Robotics

4.

Attach the Receiver Module [RX75] to the underside of the chassis using two #8-32 x 3/8"
screws [S3] and Keps Nuts [NK].

The completed model is as shown:

Build Phase

77

5.

Attach the Microcontroller [VMC] to the top of the chassis using two #8-32 x 3/8" screws [S3]
and Keps Nuts [NK].

The completed model is as shown:

78

Unit 1: Introduction to VEX and Robotics

6.

To complete the next step:

Attach two Battery Straps [BST] to the underside of the chassis using two #8-32 x 3/8"
screws [S3] and Keps Nuts [NK] per strap.
Attach the 7.2 Volt Robot Battery [BP].

The completed model is as shown:

Build Phase

79

7.

To complete the next step:

Attach the Antenna Holder [AH] to the top of the chassis using one #8-32 x 3/8" screw [S3]
and Keps Nut [NK].
Slide the antenna wire into the Antenna Tube [AT].
Insert the Antenna Tube into the Antenna Holder.

The completed model is as shown:

80

Unit 1: Introduction to VEX and Robotics

8.

Connect the motor connectors into the appropriate MOTORS ports on the Microcontroller as
follows:

Connect motor 1 [MOT-1] to port 1.

Connect motor 2 [MOT-2] to port 2.
Connect motor 3 [MOT-3] to port 8.
Connect motor 4 [MOT-4], the motor nearest the antenna, to port 7.

Build Phase

81

9.

Insert a jumper into ANALOG/DIGITAL port 14 on the Microcontroller.

10.

To complete the next step:

82

Connect the Receiver Module to port Rx1 on the microcontroller.

Connect the Battery to the power port.

Unit 1: Introduction to VEX and Robotics

11.

Your Tumbler is ready to roll!

NOTE: Electrical connections are not shown.

Configure the Transmitter

You now configure the Transmitter to reverse the directional controls on channel 1. See the VEX
Inventors Guide for detailed information on configuring the transmitter.
1.

Turn on the Transmitter.

Build Phase

83

84

2.

Check the voltage. If the voltage is less than 8.9 volts, recharge the batteries in the transmitter.

3.

Press and hold the MODE and SELECT buttons simultaneously until the CONFIG menu is
displayed.

4.

Press the MODE button once to display the REVERSE menu.

5.

Press the DATA INPUT minus key once. The arrow should display next to REV (below CH
on the display).

6.

Press and hold the MODE and SELECT buttons simultaneously until the voltage is displayed.

7.

Turn on the Microcontroller and go for a drive!

Unit 1: Introduction to VEX and Robotics

Amaze Phase
Overview
In this phase, students test their first VEX robot, Tumbler.

Phase Objectives
After completing this phase, you will be able to:

Test and demonstrate a VEX robot.

Identify the basic components of a VEX robot.

Prerequisites and Resources

Before starting this phase, you must have:

Completed all sections in the Unit 1: Introduction to VEX and Robotics up to the Amaze phase.

Required Supplies and Software

The following supplies are used in this phase:
Supplies
One assembled Tumbler robot.
Notebook and pen.
Two obstacles. This can be any small object in your class.
10' x 4' of open space against a wall.

Amaze Phase

85

Evaluation
Tumbler Challenge
In this challenge, you set up a basic obstacle course to test drive the Tumbler. You learn to drive a VEX
robot, while discovering some of the neat features that Tumbler showcases.

Instructions
Figure 1
1. Choose any two obstacles available to you
in your classroom. These obstacles act as
pylons for the robot to navigate around.
2. Place the two obstacles approximately
4 apart. See Figure 1.
3. Place Tumbler beside the obstacle furthest
from the wall. See Figure 1.
4. Turn Tumbler and its transmitter on.
5. Using the joysticks, have Tumbler drive the
path shown in Figure 1.
6. When Tumbler approaches the wall, drive
directly into it and cause Tumbler to
flip over.
7. Follow the same path back to your starting
position.
8. If time permits, experiment with Tumbler
and drive it around your classroom.

Engineering Notebook
In your engineering notebook, record a journal entry describing your experiences with the Tumbler
robot. Now that you have gotten a taste of the VEX Robotics Design System, brainstorm a list of robots
you would like to create.

Presentation

86

Prepare a short presentation for your class describing your favorite and most challenging parts of
Unit 1: Introduction to VEX and Robotics.
Prepare a short presentation describing some ideas of VEX robots you would like to build.

Unit 1: Introduction to VEX and Robotics