BoardPilotHC-SR04P ultrasonic distance (3.3-5 V) with ESP32
Supply 3.3-5 V
Bus GPIO
Measures distance
Pins and ESP32 wiring
| Pin | Role | ESP32 pin | Notes |
|---|---|---|---|
| VCC | Power | 3V3 | Use 3V3: then ECHO is also 3.3 V and safe for the ESP32 |
| TRIG | Input (the ESP32 drives it) | D25 | A 10 µs HIGH pulse starts a measurement |
| ECHO | Output (the part drives it) | D26 | Pulse length = echo time. Level equals VCC: at 5 V use a divider |
| 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
- HC-SR04P seller datasheet, Supply 3 to 5.5 V; echo output at supply level; same timing as HC-SR04
Try it in 3D in BoardPilot
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Part data: CC BY 4.0, free to reuse with credit to BoardPilot.