BoardPilotHC-12 433 MHz serial radio with ESP32
Supply 3.3-5 V
Bus GPIO
Pins and ESP32 wiring
| Pin | Role | ESP32 pin | Notes |
|---|---|---|---|
| VCC | Power | 3V3 | 3.2 to 5.5 V. Draws about 100 mA when sending at full power |
| GND | Ground | GND | |
| RXD | Input (the ESP32 drives it) | D25 | UART: the part receives data here. Connect to an ESP32 TX pin (9600 baud by default) |
| TXD | Output (the part drives it) | D26 | UART: the part sends data here. Connect to an ESP32 RX pin |
| SET | Input (the ESP32 drives it) | D27 | LOW = AT command mode. Leave HIGH (internal pull-up) for normal use |
| ANT | Not wired to the ESP32 | — | Antenna: spring antenna or u.FL connector |
Suggested wiring for the 30-pin ESP32 DevKit, avoiding flash, input-only and strapping pins. BoardPilot checks it for you as you wire.
Sources
- HC-12 wireless serial port communication module user manual, Pins VCC, GND, RXD, TXD, SET; 433.4 to 473.0 MHz; 9600 baud default; supply 3.2 to 5.5 V
Try it in 3D in BoardPilot
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Part data: CC BY 4.0, free to reuse with credit to BoardPilot.