Hello, i have tried using the A4988 with a raspberry pi but that resulted with a fried raspberry pi and nothing working. Right now i’m trying to manually step the motor by having a pullup resistor in the step pin but that is not working because the output pins only give 12v @ 0.4A.
My configuration is vmot and gnd to 12v and gnd with a 100uF capacitor in parallel. A1,A2,B1,B2 to appropriate stepper motor pins. Vdd and ground to 5v and gnd. Enable, ms1, ms2 and m3 left floating. Reset and sleep connected to each other. Step with a pullup resistor to vdd and dir connected to gnd. But nothing is working when i tap the step pin with gnd.
And please could i get a refund for the raspberry pi. Everything was wired up according to your diagrams but it broke the raspberry pi. No pins were floating, both were logic 0. For me it makes no sense that the board is not functioning correctly.