AVR-Chat

>>> normaxcite@yahoo.com 02/11/2004 4:49:43 pm >>>
>Hi there,
>I'm using ADC interrupt mode in my prototype board. Everything is
running now but I'm facing accuracy problem. Can someone help >me? I
need my accuracy to be +/- 0.5%.

You won't get 0.5% accuracy using the internal reference of an AVR,
especially over temperature, they are only accurate to a few percent.
Also, do you what *absolute* accuracy, or *relative* accuracy between
two channels?, many people don't realise the difference.
Your best bet is to use a nice external reference chip better than 0.5%
over temperature.
Make sure you get your star grounding correct too.

Dave :)