AVR-Chat

How are your "grounds" Aaron?  If your return lines are at some 
different potential you'll have errors such as this.

Sometimes it's better to have a differential amplifier on the input to 
alleviate this problem.


REB



A F wrote:

>Im using the adc on a mega8 with a 5v LM4050 precision shunt as an external reference. I am able to read the full scale of 0 to 1023, the problem is that 0 is returned for any voltage under about 0.84v. Is this a limitation of the adc or am I doing something wrong? thanks
>
>--Aaron
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>