To connect the Arduino Nano ($U1$) and the NodeMCU ($U2$) using UART, follow these steps:
Connect the TX pin of $U1$ to the RX pin of $U2$.
Connect the RX pin of $U1$ to the TX pin of $U2$.
Connect the GND pin of $U1$ to the GND pin(s) of $U2$.
Specifically, make the following connections:
Connect $U1$:D1/TX to $U2$:RX GPIO3.
Connect $U1$:D0/RX to $U2$:TX GPIO1.
Connect $U1$:COM/GND to $U2$:GND.
Ensure VCC and other required connections (3V3 or 5V) are properly made to power both the microcontrollers. If any clarifications are needed or assumptions are incorrect, please let me know!
jaidwaj
copilot