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DRV8825 Direction issues

Budau Marius
Prodigy 20 points
Other Parts Discussed in Thread: DRV8825

Hello to everyone, I bought some drv8825 chips in order to build a 3D printer, after I designed the carrier boards, I installed four of the chips, then when I tried to test the drivers I came across a very unusual problem, three of the drivers when in use they didn't keep the same direction, I measured the voltage at the direction pin and during test there was a constant voltage of 4.97 volts, I measured the voltage at the trimming pot and there was a constant 0.4 volts, i cannot explain myself why is this behavior, I also changed the stepper motors (the stepper motors are recovered from diferrent printers) but the problem persists. What is strange is that the fourth board works perfect, it doesn't have these symptoms.

Could please someone help me !

This is how the boards look like

  • 0
    TI__Guru** 114905 points

    Hi Budau,

    It is good to hear that you have one working board. It can be used to determine what is different between the working board and the other boards.

    Try the working board with the other motors? Does the board and motor still operate properly? If so, the motor is good and the other board is suspect. If not, the motor is suspect. Change one item at a time to determine if the board, the motor (or both) is suspect.

    If DIR is 4.97V, I am assuming that an external microcontroller is driving the pin. Is that correct?

    Do all motors have the same specifications? If not the VREF may have to be adjusted to compensate for the motor.

  • 0 in reply to Rick Duncan
    Prodigy 20 points

    Hello, thank you for the reply.

    I finally managed to get the boards to work, there were some faulty connections on the board.

    And yes the drivers are controlled by an Arduino Mega.

  • 0
    Prodigy 40 points
    Hi Budau Marius, which program use you for create the PCB, i want build a 3d printer, could you share the file for the PCB?, thanks and have a nice day.