Android programming - measure frequency of microphone input and convert it

Discussion in 'Programmer's Corner' started by praondevou, Feb 3, 2016.

  1. praondevou

    Thread Starter AAC Fanatic!

    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.

  2. sirch2

    Senior Member

    Jan 21, 2013
  3. joeyd999

    AAC Fanatic!

    Jun 6, 2011
    And there are a *ton* of apps for tuning musical instruments.