BoardPilotBar load cell 1-20 kg (4 wires) with ESP32
Supply 3.3-5 V
Measures weight, force
Pins and ESP32 wiring
| Pin | Role | ESP32 pin | Notes |
|---|---|---|---|
| RED | Not wired to the ESP32 | — | Excitation + (E+ on the HX711). Never to the ESP32 |
| BLACK | Not wired to the ESP32 | — | Excitation - (E- on the HX711) |
| WHITE | Not wired to the ESP32 | — | Signal - (A- on the HX711) |
| GREEN | Not wired to the ESP32 | — | Signal + (A+ on the HX711). Colours vary: if readings fall under load, swap A+ and A- |
Suggested wiring for the 30-pin ESP32 DevKit, avoiding flash, input-only and strapping pins. BoardPilot checks it for you as you wire.
Sources
- Avia Semiconductor HX711 datasheet, Bridge input A+/A-, excitation E+/E-
- Typical bar load cell seller datasheet, Full bridge, rated output about 1 mV/V
Try it in 3D in BoardPilot
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Part data: CC BY 4.0, free to reuse with credit to BoardPilot.