btbass said:This depends on the type of reading you want to do?
The simplest way is to rectify the AC voltage and read the resulting DC level, this will give you peak AC volts.
You can get some IC's that convert AC voltages to RMS DC levels. Google 'rms to dc converter ic'.
If your adc is fast enough, you could sample the AC voltage wave form at greater than twice it's maximum frequency. You could then use dsp maths to calculate the voltage and frequency.