So manual switch-S1 and switch-S2 must be OFF during NodeMCU Boot. **If you use switch (latched), the Boot will fail if SD3 and D3 are grounded during the Boot process. I have used the INPUT_PULLUP function in Arduino IDE instead of using the pull-up resistors with each switch.Īs per the source code, when the control pins of the relay module receive the LOW signal the respective relay will turn on and the relay will turn off for the HIGH signal in the control pin. The circuit is very simple, I have used D1, D2, D5 & D6 GPIO pins to control the 4-channel relay module.Īnd the GPIO SD3, D3, D7 & RX connected with the pushbuttons to control the relay module manually. Required Components for ESP8266 Home Automation PCB for the Tasmota NodeMCU Smart Home Project. ![]() Configure the GPIO pins in Tasmota Dashboard.Configure the ESP8266 GPIO pins in Tasmota dashboard.Flash the ESP8266 NodeMCU with Tasmota firmware. ![]() ![]()
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