AVR-Chat

----- Original Message ----- 
From: Jose Fuentes
To: AVR-Chat@yahoogroups.com
Sent: Thursday, January 13, 2005 2:13 PM
Subject: [AVR-Chat] ADC ACCURACY AND NOISE


I am trying to make a ohm-meter using Atmega16.  The
problem is that the ADC is reading values that change
all the time (at least the five less significant bits
change all the time).  I think there are several
factors that affect the precision of the ADC.  Some of
these factors are hardware related, an other has to do
with the firmware.  I know the lower the ADC clock is,
the better precision you get.  Also, the AD conversion
can be done in sleep mode.  Any suggestions?

How does it behave if you are simply reading an input voltage, from a pot, 
say? I don't have any problems with that, using a Mega8535. The reading is 
very stable.

Leon 



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