Quote Originally Posted by mackrackit View Post
Forget the opamp. The thread was talking about using a simple voltage divider to scale the signal voltage down to PIC level. If you have 6 volts use a 1 to 1 voltage divider to make 3 volts. Set the ADC reference voltage to see full scale (apply 6 v to divider ADC out put 255) and you should be good to go.
I totally agree with you. But maybe I forgot to explain something that, unfortunatelly, I am not sure. My car fuel sensor is a voltage divider, I think. The sensor is a variable resistor and its range is from 40 to 280 ohms and it turns that the voltage range, as I said, is from 0 (1,66V) to 6V. If I use a simple voltage divider in this fuel signal, will not it change the signal that is being send to the car? That is the reason why I am using the opamp as a buffer..

Thanks again..