Hi, I am trying to control a 120V heater with 3-phase AC using a arduino and relay. I am using the relay module KY-019 as in the following instruction. [image] KY-019 5V Relay Module - ArduinoModulesInfo Arduino code & Fritzing part - KY-019 5V Relay Module, commonly used to control AC …

Controlling a 3 wire AC 120v heater with relay

Paul_B October 26, 2021, 11:58am 8

Most certainly is, not "can be" but "must be". If it is not connected, you may well be getting a "feeling"!

Nothing to do really with the Arduino "ground".

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