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The analog signal has noise on it. So, it is changing small amounts all the time. Even if you do not touch it, it is still changing.Evert hing is working and only issue is last digit value is varying even analog input doesn't change.
Dear DerHow do you expect us to help if you don't give us ANY information about your project? Where is the schematic? Where is the code? How do you have everything hooked up?
Dear misterThe analog signal has noise on it. So, it is changing small amounts all the time. Even if you do not touch it, it is still changing.
Try averaging. Add up four analog readings and then divide the sum by four.
The ADC value may be fluctuating a few counts even with a steady input signal.