Arduino Relay Tutorial - Circuit Geeks

Arduino is a 5v (some are 3.3v) system, so we can easily control any 5v device using an Arduino output pin. But we cannot control high-voltage appliances directly with an Arduino, we need a relay for this. Relay is very helpful for controlling high voltage (120-240V) appliances like lights, fans, heaters, etc. using Arduino or Read more ➯

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