I am trying to read mic output via SPI. I am using an ADC0831 8 bit convertor. I tested the ADC and the code by using a voltage regulator. The value coming from the ADC's DO pin is correct.
I want to read the voltage of the mic and store it as raw sound data. However the value I read from RPi SPI is always betweeen 248-250 (8 bit value with respect to VREF). I cannot read any other voltage which is relevant with the sound.
Any help is appreciated