SN755410 Circuit -- can't get motors to fire in opposite directions

Discussion in 'The Projects Forum' started by Ladvien, Sep 29, 2012.

  1. Ladvien

    Thread Starter New Member

    Sep 29, 2012
    I have wired up a little four motor tank. I'm using the SN754410 chip to drive it--everything works fine, except I can't get the motors on each side to go in opposite directions.

    Forward works
    Back works.
    Turn right, only fires left side motors.
    Turn left, only the right side motors fire.

    What I would like, is if turning right--the left motors go forward and right motors go back. Making a zero point turn.

    I'm a hack, and content with it. But, I'm obsessing over this detail.
  2. shortbus

    AAC Fanatic!

    Sep 30, 2009
    You need another SN754410. Then each motor has its own H-bridge. The chip logic doesn't allow both directions to be on at the same time.
  3. Ladvien

    Thread Starter New Member

    Sep 29, 2012
    Awesome. I thought it was a chip logic issue. I just didn't have the smarts to deduce it. Again, thank you. I have another another H-bridge, so it's a simple fix. :)