M5Stack Mini Weight Unit (HX711) Load Cell Amplifier

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WEIGHT integrates a HX711 24 bits A/D chip that is specifically designed for electronic weighing device.

The input multiplexer selects either Channel A or B differential input to the low-noise programmable gain amplifier (PGA). Channel "A" can be programmed with a gain of 128 or 64, corresponding to a full-scale differential input voltage of ±20mV or ±40mV respectively.

when a 5V supply is connected to AVDD analog power supply pin.

Channel B has a fixed gain of 32. There is no programming needed for the internal registers. All controls to the HX711 are through the pins.

In the test, we have this Unit channel A to connect a pressure sensor. Then, use M5Core screen to display the weight data.

Product Features

  • Two selectable differential input channels
  • On-chip active low noise PGA with selectable gain of 32, 64 and 128
  • On-chip power supply regulator for load-cell and ADC analog power supply
  • On-chip oscillator requiring no external component with optional external crystal
  • On-chip power-on-reset
  • Simple digital control and serial interface: pin-driven controls, no programming needed
  • Selectable 10SPS or 80SPS output data rate
  • Simultaneous 50 and 60Hz supply rejection
  • Current consumption including on-chip analog power supply regulator: normal operation < 1.5mA, power down < 1uA
  • Operation supply voltage range: 2.6 ~ 5.5V
  • Operation temperature range: -40 ~ +85℃
  • 16 pin SOP-16 package
  • Program Platform: Arduino, UIFlow(Blockly, Python)
  • Two Lego-compatible holes

Include

  • 1x WEIGHT Unit
  • 1x Grove Cable

Applications

  • Micro weight meter
  • Kitchen Scale

Specification

Resources Parameter
Operating Voltage g
Operating Current g
Net weight 8g
Gross weight 20g
Product Size 40*24*12mm
Package Size 67*53*12mm

LEARN AND DOCUMENTS

  • DOCUMENTS
  • M5Stack Smart Supermarket
    Thanks for the source code and project information provided by @沧海

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