This projects shows how to interface the arduino with a AC 220V load in a safety manner using AC relay MST_K17 module. So you can control (turn on/off) the AC load without problem in term of safety because there is opto coupling. The MST_K17 module can be driven using the an Arduino pin ( 5V) as a led. The optocoupler drives the Triac during the zero crossing of the AC line. The load can be a lamp, motor or heater.
AC Line Load Opto Control
How to interface a 220V load with the Arduino in safety mode.

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