HX711-STM32-Library

A simple library to provide control over the hx711 load cell module for STM32

Example functions are provided in the example dir. According to the datasheet, channel A can implement a gain of 128 or 64, and channel B has a fixed gain of 32.

Each load cell voltage is characterised by the equation: $U = weight*g+offset$
The offset is removed by the tare function, and g is a characteristic of the load cell that needs to be measured.

⚠️ The value of g depends on the load cell and should not be confused with the HX711 channel gain.⚠️

Load cell gain

The load cell gain can be easily measured. The procedure is as follow:

• First, initialize the module and set the scaling factor to 1 (set_scale()).
• Then, tare the scale (tare_all()).
• Once the module has been correctly initialized, measure a known weight and note the value obtained from the HX711 module.
• Divide this value by the real value. The result is the parameter you need to pass to set_scale.