BoardPilotHC-SR04 ultrasonic distance with ESP32
Supply 5 V
Bus GPIO
Measures distance
Pins and ESP32 wiring
| Pin | Role | ESP32 pin | Notes |
|---|---|---|---|
| VCC | Power | VIN | Needs 5 V: use VIN |
| TRIG | Input (the ESP32 drives it) | D25 | A 10 µs HIGH pulse starts a measurement |
| ECHO | Output (the part drives it) | D26 | Outputs 5 V: use a voltage divider (e.g. 1 kΩ + 2 kΩ) before the ESP32 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.
This module is sold for 5 V. Its outputs may be 5 V: use a level shifter or a voltage divider on ESP32 inputs.
Sources
- Cytron / ElecFreaks HC-SR04 user manual, Pins VCC, Trig, Echo, GND; 10 µs trigger pulse; 5 V supply
Try it in 3D in BoardPilot
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Part data: CC BY 4.0, free to reuse with credit to BoardPilot.