HX711 Load Cell Amplifier Module
- High-precision 24-bit Analog-to-Digital Converter (ADC) designed for weigh scales.
- Features dual differential input channels (A and B) for connecting multiple load cells.
- Includes an on-chip Programmable Gain Amplifier (PGA) with selectable gains of 32, 64, or 128.
- Simple, two-wire Serial Digital Interface (DOUT and PD_SCK) for microcontroller communication.
- Selectable output data rate of 10 Samples Per Second (SPS) or 80 SPS.
- Ultra-low power consumption: <1.5 mA in normal operation and <1 µA in power-down mode.
Product Details
HX711 Load Cell Amplifier Module - 24-Bit Precision ADC for Weigh Scales
The HX711 Load Cell Amplifier Module is the definitive breakout board for integrating load cells and strain gauges into any digital weighing or force-sensing application. At its core is the Avia Semiconductor HX711 chip, a precision 24-bit Analog-to-Digital Converter (ADC) that transforms the minuscule analog voltage changes from a Wheatstone bridge load cell into a high-resolution digital value.
The module is specifically engineered to amplify the very small differential signal generated by a load cell, with an integrated, low-noise Programmable Gain Amplifier (PGA) offering gains of 32, 64, or 128. This high gain, combined with the 24-bit resolution, ensures exceptional accuracy and precision, making it the perfect front-end solution for electronic scales. Communication is streamlined using only two digital pins (Clock and Data), allowing for effortless interfacing with microcontrollers like Arduino, ESP32, and Raspberry Pi.
🔧 Key Features
- ADC Resolution: 24-bit (Delta-Sigma) for extreme measurement precision.
- Gain: Selectable PGA gains of 128 (Channel A), 64 (Channel A), and 32 (Channel B).
- Channels: Two configurable differential input channels (A and B).
- Interface: Simple 2-Wire Serial (DOUT and PD_SCK) digital communication.
- Data Rate: User-selectable data output rate of 10 SPS or 80 SPS.
- Noise Rejection: Simultaneous 50Hz and 60Hz supply rejection.
💡 Applications
- Building Digital Weighing Scales (Kitchen Scales, Body Scales, Industrial Scales).
- Force and pressure measurement systems using Strain Gauges.
- Tank/Hopper level monitoring and inventory control.
- Educational and DIY load sensing projects.
⚙️ Technical Specifications
| Converter Chip | HX711 |
| Resolution | 24-bit |
| Operating Voltage | 2.6V to 5.5V DC |
| Logic Compatibility | 3.3V and 5V Microcontrollers |
| Output Data Rate | Selectable 10 SPS / 80 SPS |
| Current (Normal Operation) | ≤1.5 mA |
| Current (Power Down) | ≤1 µA |
| Temperature Range | −40 ∘ C to +85 ∘ C |
📦 Package Includes
- 1 × HX711 Load Cell Amplifier Module
- 1 × 10-Pin Male Header (Unsoldered)
Specifications
- TypeHX711
- Operating Voltage2.7V - 5.5V
- Temperature Range-40°C – 80°C
- Output TypeDigital Serial
- Sampling RateSelectable 10 SPS / 80 SPS
- Interface2-Wire Serial
