Android programming - measure frequency of microphone input and convert it

Thread Starter


Joined Jul 9, 2011
Not expecting a complete solution just wanted to know if something like this already existed.

I made a small circuit that gives me about 3VDC , 9mW from my cellphone audio port and I would like to use that voltage with sensors. The idea is to generate a frequency or PWM that goes back in to the microphone input. The android app would have configurable units and would allow me to configure what measured frequency corresponds to what value, e.g. 20Hz = -20 Fahrenheit and 20kHz = +200 Fahrenheit etc. Something like a configurable relationship between frequency and what I want to measure.

I totally suck at programming, I wonder if somebody has seen such an app.