slipstick:
You can't get a more accurate result than 0 - 1023 with the 10 bit ADC in most Arduinos. You could multiply it by 100 so you had 0 - 102300 but the last 2 digits would only ever be 00 so it's no more accurate.If you really need to measure to an accuracy of better than 1 part in 100,000 (though I can't imagine why) then you need an ADC with more than 16 bits. No Arduino has one of those as standard.
Steve
Thank you very much, do you know of any boards that do offer this?
Thanks