#194
Today we will hack an IKEA SALTVIKEN bathroom scale and create a connected weight sensor for up to 150 kg. We will use Googles free No- SQL Firebase cloud service as a data storage. To do that, we have to tear this nice scale apart and have a look inside.
We will:
Re-use the load cells of the IKEA scale to measure heavy loads up to 150 kg or another scale, maybe even old an defective one
Replace the original PCB with an HX711 and an ESP32 (should also work on ESP8266)
Learn from IKEA how to wire the four special load cells that they add the weight
Transfer data to the new No-SQL database “Firebase” provided by Google
Calibrate the scale
Links:
Sketch and connections: https://github.com/SensorsIot/Weight-...
Firebase Library: https://github.com/ioxhop/IOXhop_Fire...
How to wire 3 wire Load Cells: http://bit.ly/2HjtPXM
Conventional Load cell: http://bit.ly/2GFqt04
HX711: http://bit.ly/2EtefWc http://s.click.aliexpress.com/e/ufeQB27
Load cell 50kg: http://s.click.aliexpress.com/e/u33zBIa
Load cells 5kg: http://bit.ly/2IAMfm3
For longtime use, these cells seem to be not ideal. There is a better choice, however more expensive: http://bit.ly/2Jvpb9x
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