7 years, 10 months ago.

Frequency domain representation of data from ADC


I am working with microphone and mbed. Actually i need to detect a person presence using microphone and mbed. I have designed an initail circuit and I m getting data from the microphone to the mbed. what happens is i am constantly getting almost 3.3v at microphone+amplifier output. so the values from ADC remain pretty constant. it varies a little with voice etc .

Now i want is to see if i can have a better frequency domain representation of the the data i am getting ?

How i can do that using only the mbed.

Anyone ? Please help


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