This repository contains firmware for a pickup winder based on a Ramps 1.4 board, RepRapDiscount Full Graphics Smart Controller, a 200 steps per revolution stepper motor, a servo and an Arduino Mega 2560 microcontroller board.
Video showing the winder in action
- Assemble the pickup winder as can be seen in the picture below
- Use e.g. the Arduino IDE to flash the sketch in the src/ directory to the Mega 2560
- 3d print the motor holder and pickup attachment plate (or think about an alternative way to secure the motor - I successfully used some blocks of wood and some double sided tape)
- Cut a piece of wood to approximately 20 cm by 20 cm that serves as the base
- Mount the arduino Mega 2560 in the back left corner using ca. two wood screws
- Mount the Ramps 1.4 board on top of the Arduino
- Attach at least the Z-direction stepper driver and set it to 4 microsteps using the jumpers before inserting the driver board.
- Set the jumper on the Ramps board to supply 5V power to the servo (That jumper is left of the reset button on the board)
- Attach the servo to the second servo pin from the left (it's the one corresponding to the digital pin D6 - this is important for the PWM and interrupt management)
- Secure the servo cable a little bit with a piece of tape so that it won't entangle with the pickup wire
- Attach the servo on a piece of wood to raise it up a little from the base board. Position it in such a way that the center of the servo axis aligns with the center of a pickup bobbin when attached to the motor
- At the front right attach two felt-padded pieces of wood with 2 screws. These serve as pickup wire tensioner.
- Figure out a way to connect your stepper motor to the corresponding pins on the Ramps board
- Secure the stepper motor cables with some tape so that they don't entangle with the pickup wire
- Mount the display using two wood screws, but screw them in at an angle. The back of the display will be held by the flat cables.
- Press the encoder button on the display to enter/leave a setting
- Rotate the encoder to change a setting. Since the display is so godawfully slow the code waits for a timeout until updating the display.
- Press the STOP button on the display to start the winding process
- Press the STOP button to stop the winding process, too ;)
- Press the STOP button twice (doubleclick) to reset the "Current Winds" counter to 0
- Target winds: The number of winds that the winder will stop winding at. Note that you can change this at any point. So to wind for e.g. 1000 winds and then another 1000 winds first set the target winds to 1000, start the winding, and after it stopped set the target to 2000 and start the winding again.
- Current winds: The current number of winds performed since the counter was last reset
- Wind direction: Can be either 1 or -1 corresponding to either clockwise/anticlockwise or anticlockwise/clockwise directions depending on how you wired the stepper motor
- Speed W/s: The speed in winds per second
- Acceleration W/s^2: The acceleration used to ramp up to the selected speed
- Winds/Sweep: The number of winds performed for a full servo sweep. So if you select 100 here, the servo will be swept from Right limit to Left limit during the first 50 winds and from Left limit to Right limit during the second 50 sweeps. Then the dance starts all over.
- Right limit deg.: The first servo limit
- Left limit deg. The second servo limit
- The button handling is done purely in software without interrupts, so sometimes presses are missed.
- To be figured out
- Florian Paul Schmidt
- Florian Hofmann