I have been working in a Arduino project lately which requires human voice input to Arduino with some processing Arduino need to perform specific task. Simple sampling of incoming signal and calculating average amplitude from it nothing complex.
My problem is I have tried using electret microphone to receive human voice input but failed since the Elec Mic is not sensitive to detect the voice even though i hooked up with LM386 amplifier circuit. So that option is out of the picture. Then i intend to use Android mobile headphones (TRRS) to receive the human voice which will provide great sensitivity for our voice.
Starting through simple internet searches i bought a product 3.5mm breakout module from Ebay. But am unsure of how to connect them to Arduino. Different sources in internet giving different information i couldn't figure out how to connect the headphone to arduino and read it's Mic output from headphone.
Seeing the pin out of TRRS headphones i can't understand how could i possibly power my headphones with only GND pin available. I tried several wiring connections given in the internet to read the Mic output of my headphones through Analog pin A0 of Arduino but no luck so far. So my question is
1) How do i power the TRRS headphone using Arduino?
2) How can i read the MIC output of my headphone using Arduino? Is it even possible?
3) I have read somewhere the audio out from headphones will be of FSK modulated is it true?
Any help will be much appreciated. Please do provide if you have any links that might answer my questions.
Thanks in advance.