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 | Parameter |
| Net weight | 8g |
| Gross weight | 20g |
| Product Size | 40 x 24 x 12mm |
| Package Size | 67 x 53 x 12mm |
