M5Stack Mini Weight Unit (HX711) Load Cell Amplifier

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

The input multiplexer selects either a 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.

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.

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°C
• 16 pin SOP-16 package
• Program Platform: Arduino, UIFlow(Blockly, Python)
• Two Lego-compatible holes

Package Contents

• 1x Weight Unit
• 1x Grove Cable

Specifications

Resources