Controlling vibration motor with sound

Discussion in 'The Projects Forum' started by Erine, Feb 21, 2012.

  1. Erine

    Thread Starter New Member

    Feb 21, 2012

    I want to set up a vibrating motor where the frequency is dependant on sound captured through a microphone, so the louder the noise the higher the vibration frequency. I was thinking there might be something like a sound dependant resistor available, or maybe im being silly?

    There is also an option of using prerecorded sound to manipulate the vibration frequency but as i think this may be more complicated maybe i can try that after having a go with a microphone.

    I am very new to circuits so please nothing too advanced.

    Thank you for your time :)

  2. Felo


    Feb 20, 2012
    I think you need to build a sound level meter (there is plenty of circuits around) and interface its output to a PWM driving your motor. That should give you a start.
  3. luvv


    May 26, 2011
    You could use a 555 timer as a voltage controlled oscillator.

    Just fed the amplified output of the mic through a capacitor to the number 5 pin of the 555.

    It will output a audio modulated square wave which you use to drive the gate of a logic level mosfet.

    Not sure this would do exactly what you are looking for but it would do something for sure ;)