Hi,
I am debugging my new Rpi Shield that hosts a A4988 stepper driver. When applying the focuser driver, nothing happens. So I wanted to see whether the GPIOs are sending signals to the A4988. To do so, I put a led and resistor (100 ohm) between the DIR pin and ground, likewise for the STEP pin - instead of attaching the shield to the GPIO connector. The led is showing a very low light, almost neglectible for both pins, even without attempting to run the stepper.
Does my test setup make sense, should the led be against gpio and ground, or against 3,3V?
What should I expect when running the stepper, should the led attached to the STEP only flash up when running the stepper?
Should the led attached to the DIR pin always be „on“?
Many thanks for any support, Helge
I am debugging my new Rpi Shield that hosts a A4988 stepper driver. When applying the focuser driver, nothing happens. So I wanted to see whether the GPIOs are sending signals to the A4988. To do so, I put a led and resistor (100 ohm) between the DIR pin and ground, likewise for the STEP pin - instead of attaching the shield to the GPIO connector. The led is showing a very low light, almost neglectible for both pins, even without attempting to run the stepper.
Does my test setup make sense, should the led be against gpio and ground, or against 3,3V?
What should I expect when running the stepper, should the led attached to the STEP only flash up when running the stepper?
Should the led attached to the DIR pin always be „on“?
Many thanks for any support, Helge