forward and reverse rc servo with a single throw switch?

Discussion in 'The Projects Forum' started by rccarnut, Nov 29, 2011.

  1. rccarnut

    Thread Starter New Member

    Nov 29, 2011
    hello all,
    this is my first time here and i need a little help. i found my way here searching for info on reversing a rc servo with the single throw switch on my tx. i found a short video of what i want to do any help on what circuitry i need to make this work would be greatly appreciated.
  2. THE_RB

    AAC Fanatic!

    Feb 11, 2008
    You can use a 555 timer IC, as an astable frequency generator with the correct duty cycle to give the waveform for RC servo position 1.

    Then a switch can short out a resistor (or change over a resistor) in the timer and change the duty cycle, so the RC servo will then move to position 2.

    If you use a couple of pots for the resistors that control duty cycle you can set each position with a pot, then use the switch to move from position 1 to position 2.
  3. SgtWookie


    Jul 17, 2007
    Hmm - I think that there is just a bit more to it than that, Roman.

    You mentioned "servo", but need to verify:
    Is it a servo that rotates 360 degrees continuously?
    Or is it a servo that you want to run all the way to the right, then back to center, then all the way to the left, then back to center?
    Or is it a DC motor that you wish to run forwards & backwards?

    What voltage(s) do you have to work with?