Posted: Thu Jan 06, 2005 1:54 am Post subject: Precision of dividing bridge
Hi,
I try to mesuring the 5 - 6V with ATMEGA8L in 3.3V.
I divide the mesuring voltage with the bridge divider two resistor 10K with 0.1% tolerance.
I test my bridge with input 5.16V and i have in center 2.58V is't nice.
I connect the center of bridge to the ADC0 on AVR and i check with the multimeter and i read 2.72V and the value read by the AVR it's same.
Why the AVR change the voltage of my bridge and what the solution (hardware/software) ?
Thanks
Olivier
Ps: I use STK500. The AVCC and AVREF it's same (3.3V) _________________ Thanks
Olivier
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