AVR-Chat

magzky02 wrote:
> Hello guys
> 
> i have to measure a voltage using ADC and display it on LCD display or 
> seven segment display. My problem is that the the voltage to be 
> measured is from 0-70 volts. if i use a 2.5 voltage reference, and use 
> voltage divider, i think it will not be accurate anymore because of 
> resistor tolerance. any better idea on how?

Add a trimpot in the resistor divider. Measure a voltage and adjust
the pot until the reading agrees with a 4-digit multimeter.