For a home automation project, I want the 3,7-Volt-signal of a motion sensor (or an Arduino) to switch on a 220-VAC-device. On this forum, I found this old discussion http://forum.arduino.cc/index.php/topic,24335.0.html with the schematic in picture 1. I am rather new to this but it looked like a sa…

Help wanted with digital 220 VAC switch

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