From a safety point of view -
1) Get an LED, walwart with low voltage AC output, say 12 V, off ebay. Add a series circuit,
R + LED + Diode and wire to Walwart output. Now you have a led whose brightness is propor-
tional to AC line voltage. This should cost you < $ 5.
2) Get Arduino Uno + a photocell. Use photodiode in a divider and feed to Arduino analog in.
Tape photo diode to LED. Or get an optocoupler which has LED and photo sensitive transistor
isolated output. Add a little code to do peak detection (you do not have to do an analog peak
detector, just do it in code), and start logging values, and output thru UART to PC file. Or write
a little python code and display results on PC.
3) Or use a simple Arduino DAQ solution like -
https://sites.google.com/site/measuringstuff/the-arduinoAgain use a simple transformer to lower and isolate the AC line voltage.
Regards, Dana.
Regards, Dana.