I have a accelerometer but the accelerometer has a offset of 1,5 volt. And with 1G it has an ouput voltage from about 1,9 volt. I would like to set the full resolution ( 10 bit ) to the input range from 1,5 volt to 2 volt. I already used the analogReference function but I would like to increase the underbound. It is also possible to use first a voltage divider but resistors aren't precies enough for this job.