Arduino 220VAC Optoisolated Sensor

Green LED = Optocoupler input signal (220 VAC = "1"; 0 VAC = "0")
Red LED = Otpocoupler output signal (220 VAC = "1"; 0 VAC = "0")

The electrical schematic is available here:
http://store.picbg.net/pubpic/17/E7/01757e6267b917e7.jpg

The only difference with my circuit is that on the diagram the output signal is reversed, i.e. you will have logic "0" when there is presence of 220VAC at the input and logic "1" when there is no voltage.

Видео Arduino 220VAC Optoisolated Sensor канала Boyan Aleksandrov