HX711 Load Cell Amplifier Module

This Weight Sensor amplifier is based on HX711 and has an amplifier and a precision 24-bit analog-to-digital convertor designed for weigh scale and industrial control applications to interface directly with a bridge sensor. The HX711 uses a two wire interface (Clock and Data) for communication. Compared with other chips, HX711 has added advantages such as high integration, fast response, immunity, and other features improving the total performance and reliability. Finally it's one among the best choices for electronic enthusiasts.

The dual-channel 24 Bit Precision A/D weight Pressure Sensor Load Cell Amplifier and ADC HX711 Module is a small breakout board; By connecting the module to your microcontroller you will be able to read the changes in the resistance of the load cell. With some calibration, you’ll be able to get very accurate weight measurements.

This can be handy for creating your own industrial scale, process control, or simple presence detection. The HX711 Weighing Sensor uses a two-wire interface (Clock and Data) for communication. Any microcontroller’s GPIO pins should work and numerous libraries have been written making it easy to read data from the HX711.

Connect the wires from your load cell as below:

• 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.

Specifications

• Output Sensitivity: 1.0 ± 0.1 mV / V
• 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
• Measurement Resolution: 24 bit
• On-chip oscillator requiring no external component with optional external crystal
• Weight : less than 5 grams
• Dimensions : 2.5 x 1.5 x 0.5cm