The HX711 Module is a small breakout board that contains the HX711 IC, which can read load cells to measure weight with 24-bit precision. The module connects to your microcontroller via a two-wire interface (Clock and Data) and allows you to calibrate the load cell for accurate weight measurements. This module can be useful for applications such as industrial scales, process control, or presence detection. Many libraries are available to make it easy to use the HX711 with different microcontrollers.
Load cells have four wires that form a Wheatstone bridge and connect to the HX711. The wires are usually coloured RED, BLK, WHT, GRN, and YLW.
Each colour corresponds to the conventional colour coding of load cells :
- Red (Excitation+ or VCC).
- Black (Excitation- or GND).
- White (Amplifier+, Signal+, or Output+).
- Green (A-, S-, or O-).
- Yellow (Shield).
The YLW pin acts as an optional input that not hook up to the strain gauge; but is utilized to ground and shield against outside EMI (electromagnetic interference). Please keep in mind that some load cells might have variations in colour-coding.
Pinouts :
Analog Side :
- E+: Excitation positive.
- E-: Excitation negative.
- A-: Channel A Negative Input.
- A+: Channel A positive Input.
- B-: Channel B Negative Input.
- B+: Channel B positive Input.
Digital Side :
- GND: 0V / Ground Power Connection.
- DT: Data IO Connection.
- SCK: Serial Clock Input.
- VCC: Power Input.
Features
- Recommended excitation voltage: 5-10V.
- Two selectable differential input channels.
- On-chip active low noise PGA with a selectable gain of 32, 64 and 128.
- On-chip power supply regulator for load-cell and ADC analogue power supply.
- Selectable 10SPS or 80SPS output data rate.
- 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.
- Simultaneous 50 and 60Hz supply rejection.
Package Includes
- 1 xHX711 Weighing Pressure Sensor Module Big Size with Soldering
manjeet bhumij (verified owner) –
works totally fine