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Arduino based 4 channel toggle switch using 4 relays, 4 tactile switches, an Arduino Nano, the circuit required 12V DC, the relay can handle load up to 7Amps 230V DC or 7Amps/30V DC. Scematic and PCB Layout availbale at https://www.twovolt.com/2019/09/20/arduino-4-channel-on-off-toggle-switch/
sevencafelatte/Arduino-4-channel-on-off-toggle-switch
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