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H-bridge + an inverter — Parallax Forums

H-bridge + an inverter

UghaUgha Posts: 543
edited 2009-02-03 17:19 in Robotics
I was thinking the other day... I can connect an inverter to my H-bridge and control the motor's direction
only using 1 stamp pin.

Has anyone else done this?
Did you PWM the inverted line or did you use the H-bridge's enable pin?
Did you miss dynamic breaking or was the saved I/O line worth it?

Comments

  • RobotWorkshopRobotWorkshop Posts: 2,307
    edited 2009-02-03 16:32
    If you want to control the direction and speed of a motor using only 1 Stamp pin then look at using some of the H-Bridges already setup to do that. The HB-25's that Parallax offers will do this. There are also others from Vantec, Robot Power, etc that use a single pin and drive a regular motor. You'll basically be using a servo style pulse train to control the speed/direction of the motor.

    Robert
  • UghaUgha Posts: 543
    edited 2009-02-03 17:19
    Yeah, I realized after posting this that if you use PWM on the direction line, you'd be causing it to change directions super-fast... not reduce the speed.
    So two pins, one for enable/PWM and one for direction control.

    I understand that the HB-25 is a really nice product, but its both out of my price range and overkill for my application.
    I'm using some cheap ($2.35) single chip h-bridges that work just fine, I was just curious if anyone else had used an inverter to reduce the number of
    pins required.
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