CHI030A PICAXE-18 STANDARD PROJECT BOARD
Introduction
The CHI030A standard board uses a darlington driver IC to provide power to 8
digital (on/off) outputs (PICAXE pins B.0 to B.7). Each output is rated at 500mA.
6 digital (or 4 digital/2analogue) inputs are also available (PICAXE pins C.0 to
C.7), all prefitted with a 10k pull down resistor for ease of use.
A high power board is also available (part CHI035A) separately. This uses 4 FETs
to provide 4 high power digital outputs (rated at 1.5A each), and the option of a
L293D motor driver IC to provide 2 reversible motor outputs, rated at 1A each.
Both boards are supplied ready for immediate use with the PICAXE-18M2 chip.
The inputs (portC) are on the left and buffered outputs (portB) are on the right.
The direct (non-buffered) portB PICAXE outputs are also available in the centre of
the board for connection to logic level devices (e.g. an AXE033 Serial LCD).
V1+
CHI030A
V2+
C.0
B.7
C.1
B.6
C.2
C.4
18M2
C.3
C.5
C.6
V1
B.7
B.6
B.5
B.4
B.3
B.2
B.1
B.0
G
B.5
B.4
B.3
B.2
B.1
C.7
B.0
G
G V1+
G V2+
To use the board with an older (now discontinued) 18/18A/18M/18X PICAXE
part an extra 1k resistor *MUST* be soldered to the board in the RST resistor
position. If desired an optional reset switch (part SEN030) may also be fitted in
position S1. Note that the current release PICAXE-18M2 does not have a reset
pin, so does not require the RST resistor or the reset switch to be fitted.
switch and 1k RST
resistor added
V1+
CHI030A
V2+
IN0
OUT7
IN1
OUT6
RST
IN6
18/18A/18M/18X
IN2
V1
B.7
B.6
B.5
B.4
B.3
B.2
B.1
B.0
G
OUT5
OUT4
OUT3
OUT2
OUT1
IN7
OUT0
G
G V1+
G V2+
For the full datasheet for this product please see www.rev-ed.co.uk/docs/chi030a.pdf
revolution
Revolution Education Ltd. Web: www.picaxe.co.uk
Version 4.0 03/11
CHI030A.PMD
PICAXE-18 STANDARD PROJECT BOARD
Circuit Board Preparation
Many Revolution Education project boards including the CHI030A are supplied
with a protective peelable layer over the user solder pads on the rear of the PCB.
This layer may be red or green in colour and can be easily peeled off with your
finger nail before soldering.
This peelable layer protects the user solderable pads during manufacture and
storage, to keep the pads clean and grease free.
Note also that the solder pads on the PCBs may now appear as a dull white
milky colour, not shiny silver as in the past. This is due to the more
environmentally friendly lead-free chemicals now used for plating RoHS
compliant PCBs.
This is not a fault and the pad can still be hand soldered just as easily as the older
style shiny solder pads. No cleaning is generally required prior to soldering.
revolution
Revolution Education Ltd. Web: www.picaxe.co.uk
Version 4.0 03/10
CHI030A.PMD
PICAXE-18 STANDARD PROJECT BOARD
Project Board Power Supply
The CHI030A project board can be powered in 3 separate
different ways:
- Via a single 4.5V battery pack for both PICAXE & outputs
- Via two separate battery packs for PICAXE and outputs
- Via a higher voltage battery pack, with 5V regulator fitted
for the PICAXE.
CHI030A
18M2
Single Battery Pack.
The board requires a single 3-5V power supply to operate, a
4.5V supply is recommended via a 3xAA cell battery pack,
connected to the V2+ (PWR) terminal connections. This
pack will then power both the microcontroller and the
output devices. The black wire is connected to the G
(ground) connection and the red wire to the V2+
connection.
V1
B.7
B.6
B.5
B.4
B.3
B.2
B.1
B.0
G
black
red
4.5V
wire link cut off
Dual Battery Pack.
If a higher voltage (e.g. 12V) is required to drive the
outputs, two separate power supplies may be used. In this
case the second power supply only powers the output
devices. The 4.5V power supply is connected to V1+ (PIC)
and the second 12V power supply is connected to V2+
(PWR). When using two power supplies the wire link
(resistor with single black band) shown MUST be cut off
the board to separate the two supplies.
CHI030A
18M2
V1
B.7
B.6
B.5
B.4
B.3
B.2
B.1
B.0
G
black
red
black
red
6-12V
4.5V
78L05 regulator added
&wire link cut off
CHI030A
18M2
Single Battery Pack with Regulator
If a higher voltage (e.g. 12V) is required to drive the
outputs, one power supply plus a 78L05 voltage regulator
may be used. In this case the power supply powers the
output devices directly, and the voltage regulator provides
a 5V supply to the PICAXE microcontroller. The power
supply is connected to the V2+ (PWR) terminal
connections. When using this system the wire link (resistor
with single black band) MUST be cut off the board to
separate the two supplies, then a 78L05 voltage regulator
must be fitted as shown.
V1
B.7
B.6
B.5
B.4
B.3
B.2
B.1
B.0
G
black
input
0V
output
revolution
Revolution Education Ltd. Web: www.picaxe.co.uk
red
7.5-12V
Version 4.0 03/10
CHI030A.PMD
PICAXE-18 STANDARD PROJECT BOARD
Output Devices
Output devices are connected between the pairs of holes on the pcb (pin and
V2+) as shown below.
CHI030A
black
18M2
red
V1
B.7
B.6
B.5
B.4
B.3
B.2
B.1
B.0
G
buzzer
motor
Note that motors should be suppressed by
soldering a 220nF polyester capacitor (part
CAP002) across the motor terminals to
prevent electrical noise affecting the circuit.
On the standard project board only on/off
control off the motor is possible. It cannot be
reversed, for this type of movement the
CHI035A board is required instead.
revolution
Revolution Education Ltd. Web: www.picaxe.co.uk
Version 4.0 03/10
CHI030A.PMD
PICAXE-18 STANDARD PROJECT BOARD
Input Devices
Digital inputs are connected between V1+ and the pin as shown below.
analogue
e.g. potentiometer
pulldown resistors
removed on C.0 & C.1
18M2
CHI030A
digital
switch
V1
B.7
B.6
B.5
B.4
B.3
B.2
B.1
B.0
G
The connections marked C.3 and C.4 should not generally be used with the
PICAXE system. These are used by the PICAXE chip as the serial in and serial
out PC download connection.
All inputs are provided with a 10k pull down resistor pre fitted to the board.
However the board is also configured to allow use of inputs C.0 and C.1 as
analogue inputs. Some analogue sensors, such as a potentiometer, will require
the on-board 10k resistor to be cut off from the positions marked R8 (upper
resistor, input C.0) and R7 (lower resistor, input C.1) as shown above.
revolution
Revolution Education Ltd. Web: www.picaxe.co.uk
Version 4.0 03/10
CHI030A.PMD
PICAXE-18 STANDARD PROJECT BOARD
Connecting to the Project Boards
Inputs and outputs may be soldered via wires directly to the board. Alternately
you may wish to purchase screw terminal blocks (5mm pitch) and solder these to
the boards as shown below. This allows wires to be temporarily connected via the
screw terminals. For one board 6 sets of part CON005 (2x2 pole connector) are
required.
V1+
CHI030A
V2+
C.0
B.7
C.1
B.6
C.2
C.4
18M2
C.3
C.5
C.6
V1
B.7
B.6
B.5
B.4
B.3
B.2
B.1
B.0
G
B.5
B.4
B.3
B.2
B.1
C.7
B.0
G
G V1+
G V2+
Note that when using terminal blocks it is necessary to share the V2+ connector
with all output pins and to share the V1+ connector with all inputs. Remember
that with the darlington driver output buffer the output devices are connected
between V2+ and the output (NOT output to 0V). Like wise the inputs are
connected between V1+ and the input.
revolution
Revolution Education Ltd. Web: www.picaxe.co.uk
Version 4.0 03/10
CHI030A.PMD
PICAXE-18 STANDARD PROJECT BOARD
Appendix A - CHI030A Circuit Diagram
V1+
PIC
CHI030A Project Board (v4)
C1
100n
C2
+ 100u
V1+
C.0
C.1
C.2
C.3
C.4
C.5
C.6
C.7
G
R9 (link)
RG1
RST
1k
not fitted
V+
17
18
1
2
3
4
15
16
R1
R2
R4
R5
R7
R8
All 10k
CT1
10
14
not fitted
R11
22k
V2+
PWR
C.0
C.1
C.2
Txd
Rcv
C.5
C.6
C.7
B.7
B.6
B.5
B.4
B.3
B.2
B.1
B.0
13
12
11
10
9
8
7
6
1
2
3
4
5
6
7
8
In7
In6
In5
In4
In3
In2
In1
In0
V+
Out7
Out6
Out5
Out4
Out3
Out2
Out1
Out0
18
17
16
15
14
13
12
11
0V
0V
9 IC2
ULN2803A
IC1
PICAXE
18M2
V2+
B.7
B.6
B.5
B.4
B.3
B.2
B.1
B.0
G
S1
not fitted
H0 H7
R10
10k
G
PWR
G
PIC
revolution
Revolution Education Ltd. Web: www.picaxe.co.uk
Version 4.0 03/10
CHI030A.PMD
