Chapter · UART
Around the port
Why UART is not a voltage standard, and where all of this shows up on an ESP32.
- 11UART is not a voltage standard5 minUART describes the frame and the timing, not the voltage. The same frame can travel on a 3.3 V pin, a 5 V pin, an RS-232 port or an RS-485 pair, and joining one to another without checking is how a part ends up outside its ratings.
- 12From the model to your ESP324 minThe ESP32 has three UART ports, one of them the console. This lesson lays the course over the board, port by port, and ends with the three things to check first when nothing arrives.
Start at 11 and read down — the order is the order things get easier in. Or take the one with your part in it; every article stands on its own, and links back to whatever it needs.