Help with DS2436 Voltage monitor

[mister_e]

Vrms=Vmax*0.707

Maybe you could use some Zero crossing, and do an average around Vrms point on the SinWave? (45 degree, 2.08mSec after zero crossing for a 60Hz sine)

OR use a simple transformer BUT calibrate it...

OR Use the AC line, rectify it, drop the voltage to something readable, then process the whole thing.

Everything above will need calibration anyway.