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ESP8266 8-Channel Relay Module Home Automation - Hackster.io
5v 8-channel relay module
Wiring 8 channel optocoupler relay module
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Relay channel module circuit diagram eight 5v board internal input same each has
Relay channel module arduino 5v osoyoo pins switch opto board two vcc relays gnd pcb lesson in1 3v input in2 .
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