HX711 24-Bit Load Cell Amplifier Module – Dual-Channel Weighing Sensor ADC

The HX711 Load Cell Amplifier Module is designed specifically for applications where a strain-gauge load cell must be connected to a digital control system. The module receives the very small differential signal generated by the load cell, amplifies it using its integrated PGA, and converts it into digital data through its 24-bit ADC.

The board provides E+, E-, A+, A-, B+, and B- connections for load-cell and bridge-sensor configurations, together with VCC, GND, DT, and SCK connections on the digital side. A standard four-wire load cell is commonly connected to the excitation and Channel A inputs.

The module is widely used in DIY weighing scales, force sensors, robotics, material monitoring systems, and educational instrumentation projects. Calibration and tare operations are normally performed in software after the load cell and mechanical assembly have been installed.

Features

• 24-bit delta-sigma ADC.
• Integrated programmable gain amplifier.
• Dual differential input channels.
• Channel A gain options of 128 and 64.
• Channel B gain of 32.
• Selectable 10SPS and 80SPS output rates.
• Simple two-wire DT/SCK digital interface.
• Suitable for 3.3V and 5V microcontroller projects.
• Designed for load cells and Wheatstone bridge strain sensors.
• Low power consumption.
• Compact PCB design.
• Suitable for Arduino, ESP32, Raspberry Pi, and similar controllers.
• Male header included for convenient prototyping.

Applications

• Digital weighing scales.
• Electronic kitchen and platform scales.
• Force measurement.
• Load monitoring.
• Weight-based automation.
• Robotics force and pressure sensing.
• Material and inventory monitoring.
• Load testing systems.
• Industrial and laboratory prototypes.
• Strain-gauge experiments.
• Arduino and ESP32 weighing projects.
• Educational electronics and instrumentation.

How to Use

1. Connect a compatible load cell to the HX711 module.
2. For a typical four-wire load cell, connect the excitation pair to E+ and E- and the differential signal pair to A+ and A-.
3. Verify the load-cell manufacturer's wiring diagram before connecting the wires because wire colors are not standardized.
4. Connect VCC and GND to the appropriate power supply.
5. Connect DT and SCK to two suitable GPIO pins on the microcontroller.
6. Upload an HX711-compatible library and measurement program.
7. Allow the system to stabilize before calibration.
8. Perform a tare operation with no load.
9. Apply a known reference weight and calibrate the scale factor in software.
10. Use the calibrated readings to calculate the desired weight or force.

Important Notes

• The HX711 module does not include a load cell; the sensor must be purchased separately.
• The final measurement range depends on the connected load cell, not simply on the 24-bit ADC resolution.
• Load-cell wire colors vary between manufacturers. Always verify the sensor datasheet or wiring diagram before connection.
• Keep load-cell signal wires short and away from motors, switching regulators, relays, and other strong sources of electrical noise.
• Shielded or twisted-pair sensor wiring can help reduce electromagnetic interference in sensitive installations.
• A stable mechanical mounting arrangement is important for repeatable weighing measurements.
• Perform tare and calibration after assembling the complete mechanical system.
• The 80SPS mode provides faster updates but may produce less stable readings than 10SPS in some applications.
• Do not exceed the electrical supply limits of the module.
• Product PCB layout, component appearance, and connector arrangement may vary depending on stock.
• Please allow approximately 5% measuring deviation due to manual measurement.

Package Includes

• 1 × HX711 24-Bit Load Cell Amplifier Module
• 1 × Straight Male Pin Header Strip, 2.54mm Pitch