M5Stack Weighing interface

The weighing interface from the M5Stack range has an integrated 24-bit A / D chip HX711, specifically designed for electronic scales. The input multiplexer selects either the differential input of channel A or B for the low noise programmable gain amplifier (PGA). Channel A can be programmed with a gain of 128 or 64, corresponding to a differential input voltage of ± 20 mV or ± 40 mV, respectively, when a 5 V supply is connected to AVDD's analogue power supply pin. Channel B has a fixed gain of 32. No programming is required for the internal registers. All controls of the HX711 are connected via the pins. For example, connect a pressure sensor to channel A and then use the M5Core screen to display the weight data.