IS IT POSSIBLE TO record the voice samples with 200 m V range
this is the recorded file at arms length with my voice
Thanks.I can see that you haven't got the hardware right. Most of the file consists of zeros. It should consist of around 512 for silence. The input needs biasing up to 2.5V.
The size of any change is only very small, less that 16. This means that the signal you are getting is way smaller than the 200 mV you are expecting.
Finally I am not sure that the header file is correct. When I loaded it into Audacity it thought it was a 32bit floating point sample.
The CVS file shows you still have not got the DC offset correct.
What software are you using for recording?