iam using lpc 2138 in which the output has to be taken from the adc but at the same voltage it is giving various voltage which vary about 10% to 20%.i have checked the hardware ,there is no problem with it so if some one can help me with "ADC FILTER CODE" .so that i can make the adc output stable through software.
So what "checks", exactly, did you do ?
What were the results of those "checks", and how did you then conclude that there is "no problem" ?