Mr. Franc Urbanc:

Currently I am building the device your referenced by Atmel Corp.
(ftp://www.atmel.com/pub/atmel/aadc.exe)
and I also have found it to be very accurate. I would like to make it even more accurate and I am interested in your experience. Currently The article you referenced uses a 267,000 Ohm 1% resistor.

What value would you have to increase it to improve the accuracy?

Also have you considered increasing the table to give more than present two digits? By using another 256 bytes of table area you could get the decimal value of the results.

Mr. Scott P. Dolan, please excuse me for butting in here but this might aid in your search for a 8051 device.

Regards,

Charles Bannister