https://lastminuteengineers.com/a4988-stepper-motor-driver-arduino-tutorial/#cooling-system-heatsink
https://www.makerguides.com/a4988-stepper-motor-driver-arduino-tutorial/
Important points:
- MUST HAVE at least 47uF capacitor across the motor power supply near the motor controller. It might work for a little while when you first turn it on, but it will stop working and might damage the board. I only tried 100uF and 470uF capacitors so far, but those both work fine. Make sure to check the polarity and voltage rating on the capacitors.
- Have to adjust the current limit using the onboard potentiometer using a screwdriver before using, to make sure you don't let the motor draw too much current. You can either measure the voltage across the potentiometer with the motor disconnected, or directly measure the current that the motor is drawing.
- On the one that I first got off Amazon (https://www.amazon.com/gp/product/B08XJQNVZL/) Turning the pot clockwise increased the voltage