BoardPilotMAX3232 RS232 to TTL module (DB9) with ESP32
Supply 3.3-5 V
Bus GPIO
Pins and ESP32 wiring
| Pin | Role | ESP32 pin | Notes |
|---|---|---|---|
| VCC | Power | 3V3 | 3.0 to 5.5 V |
| TXD | Input (the ESP32 drives it) | D25 | TTL input: connect to an ESP32 TX pin. Labels differ between sellers: if no data, swap TXD and RXD |
| RXD | Output (the part drives it) | D26 | TTL output: connect to an ESP32 RX pin |
| GND | Ground | GND |
Suggested wiring for the 30-pin ESP32 DevKit, avoiding flash, input-only and strapping pins. BoardPilot checks it for you as you wire.
Sources
- Texas Instruments MAX3232 datasheet, Supply 3 to 5.5 V; DIN/ROUT are the TTL side
- Common MAX3232 DB9 modules, Header order and TX/RX labels vary: check the silkscreen
Try it in 3D in BoardPilot
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Part data: CC BY 4.0, free to reuse with credit to BoardPilot.