I have a DRV8825 board. The phase resistance of the motor I am trying to run is 3.6 ohms. Here is my pin connections:
VMOT -> 12V power supplu
Step -> IO Pin on my microcontroller(3.2V)
Dir -> IO Pin on my microcontroller(3.2V)
/SLEEP, /RESSET -> 5.2V pin on microcontroller
Ground Pins are grounded, and phase pins connected to the motor.
Without any current limiting with 12V supply and a phase resistance of 3.6 ohms it would draw way to much current for for the driver and motors.
Therefor I want to limit the current to about 1A so I need to adjust the POT until the reference voltage is about 0.5V right?
As soon as I switch on the power supply the voltages of the phase pins goes very low. Like 0.6V.
Why would this be? Am I using it in correctly?