Hi,

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

Erin

 

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.

 

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

-luvv-

 

Here is an example RMS project, all on chip except external mic.

The project is to compute RMS of input signal. That in turn you would use
to control an onchip PWM to control the vibration motor.

https://www.hackster.io/antedeluvian/measuring-an-rms-signal-on-a-psoc5-a9fa6d

Use onboard DFB, Digital Filter Block to do the RMS calc.

Regards, Dana.