Servo input: PWM or analog

Discussion in 'The Projects Forum' started by lisandro, Oct 30, 2007.

  1. lisandro

    Thread Starter New Member

    Jul 26, 2007
    Hello all,

    I am working on a "IR sensor/Schmitt Trigger" which outputs an analog signal to a Servo Motor (HS-322HD), however when plugging the servo to the Schmitt circuit it does not work

    The servo seems to be wanting a PWM signal as it is going on and off in an unsteady fashion. Does this servo works with analog, if not, what would be the way to go?

    The application: wave the hand at the IR sensor and have the motor turn on (a certain # of degrees) and then off.

    Thanks for the help!
  2. niftydog

    AAC Fanatic!

    Jun 13, 2007
    There's no need to post to multiple sub-forums, just be patient and someone will answer your question.
  3. HarveyH42

    Active Member

    Jul 22, 2007
    Posting a circuit usually will get more response, quicker...

    Servos usually need a signal between a square wave, with a pulse width between 1 and 2 ms, 1.5 ms being the middle position of the motor. The square wave is 20-50 hz, if I remember correctly. Anyway, there are several 555 based 'servo tester' circuits on the web you might be able to use with the rest of your circuit....