Smart scale for Home Assistant

This model helps you make your own connected smart scale. It will report the currently measured weight to Home Assistant.

Besides Home Assistant, you can of course make your own sketch in Arduino and have the weight sent or displayed wherever you want.

BOM (and estimate prices)

ESP32-C3 Super Mini €1.93

HX711 load cell amplifier €0.61

Load cell 75×12.7×12.7 mm, available in 1 to 20 kg ranges €1.71

USB-C cable and power supply €2.03

2 × M4×8-12 hex screws, DIN912 or similar €0.08

2 × M3×20 hex screws, DIN912 or similar €0.08

2 × M3 nuts €0.08

76 g of PLA filament, if printed at 100% infill €1.09

Estimated total cost €7.63

In case you use a different MCU, or your HX711 has a different footprint, I also included the source FreeCAD file.

Pause printing of the top part at 6.80 mm (just before the layer where the enclosed nuts are covered) and insert the 2 × M3 nuts.

Screw the load cell to the top first (with the M3×20 screws), and then to the bottom (with the M4×8-12 screws).

Attached is also a sample YAML file for your ESPHome configuration. Check the docs here for details.