So connect the LoRa module after giving the supply to NodeMCU. **The Boot will fail if RX is grounded during the Boot process. I have used D1, D2, D5 & D6 GPIO pins to control the 4-channel relay module.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. ![]() Also here I have made a voltage divider using 4.7k and 10k resistors to drop down 5V logic level to 3.3V logic level. In the receiver LoRa circuit, I have used ESP8266 NodeMCU. You can use any 5V DC supply or 9V battery to supply the circuit. On the Arduino board, a resistor is already connected in series with the D13 pin, so I have not used any series resistor with the LED for the D13 pin. The pushbuttons are connected with the D2, D3, D4, and D5 digital pins of the Arduino Nano.Īnd the LEDs are connected with D7, D8, and D13. Here I have made a voltage divider using 4.7k and 10k resistors to drop down 5V logic level to 3.3V logic level. In the transmitter LoRa circuit, I have used Arduino Nano. Required Components for the LoRA project For the Transmitter LoRa circuit
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