7Semi HX711 Load Cell Amplifier Module - 24-bit ADC for Weigh Scales
7Semi HX711 Load Cell Amplifier Module - 24-bit ADC for Weigh Scales - Image 2
7Semi HX711 Load Cell Amplifier Module - 24-bit ADC for Weigh Scales - Image 3
SKU: SENS-1532
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7Semi HX711 Load Cell Amplifier Module - 24-bit ADC for Weigh Scales

₹104.00 (Inclusive of all taxes)
Out of Stock

The 7Semi HX711 is a precision 24-bit analog-to-digital converter (ADC) and load cell amplifier module, designed to interface directly with strain gauge bridge sensors. It provides a high-resolution digital output for accurate weight measurement, compatible with microcontroller platforms like Arduino, Raspberry Pi, and ESP32.

Features

  • 24-bit Σ-Δ ADC for high-resolution weight measurement.
  • Dual differential input channels (A & B) with programmable gain (32, 64, 128).
  • Wide operating voltage range (2.6V to 5.5V) suitable for battery-powered and embedded systems.
  • Selectable data output rates of 10 SPS (for low noise) or 80 SPS (for faster response).
  • Integrated low-noise PGA and on-chip power supply regulator simplifies circuit design.

Out of stock

Description

The HX711 is a dedicated weigh-scale ADC that converts the small differential signal from a load cell or strain gauge bridge into a stable 24-bit digital output. Its integrated programmable gain amplifier (PGA) and power regulator eliminate the need for external signal conditioning components, providing a robust and simplified interface for precision measurement systems.

Engineered for stability, the module features excellent common-mode and power supply rejection (100 dB each), minimizing errors from electrical noise. Its low power consumption and flexible clocking options (internal or external) make it ideal for portable scales, industrial process control, and automation applications requiring reliable force or weight sensing.

Key Features

  • High-Resolution 24-bit Σ-Δ ADC: Delivers precise digital conversion for accurate weight and force measurement.
  • Dual-Channel Differential Input: Supports two bridge sensor inputs (Channel A with selectable gain 64/128, Channel B with fixed gain 32).
  • Programmable Gain Amplifier (PGA): Selectable gains of 32, 64, or 128 to match a wide range of sensor output levels.
  • Integrated Power Supply Regulator: On-chip regulator for bridge sensor excitation, simplifying external power design.
  • Selectable Data Rate: Choose between 10 SPS for maximum resolution/low noise or 80 SPS for faster update rates.
  • Excellent Noise Immunity: High common-mode and power supply rejection (100 dB) ensures stable readings in electrically noisy environments.
  • Low Power Consumption: Optimized for battery-operated devices with normal and power-down modes.
  • Wide Operating Voltage: Operates from 2.6V to 5.5V, compatible with 3.3V and 5V logic systems.

Applications

  • Digital bench, kitchen, and industrial platform weighing scales.
  • Process control and batching systems in manufacturing and packaging.
  • Embedded force measurement in robotics and automation.
  • Portable and battery-powered load monitoring devices.
  • Academic projects and prototypes involving strain gauge or load cell sensors.

Technical Specifications

ParameterSpecification
ADC Resolution24-bit Σ-Δ
Input Channels2 Differential (A & B)
Channel A Gain64, 128 (Selectable)
Channel B Gain32 (Fixed)
Full-Scale Input (Gain 128)±20mV (at 5V AVDD)
Full-Scale Input (Gain 64)±40mV (at 5V AVDD)
Full-Scale Input (Channel B)±80mV (at 5V AVDD)
Output Data Rate10 SPS, 80 SPS (Selectable)
Output Data Format24-bit 2's Complement
Settling Time400ms (10Hz), 50ms (80Hz)
Input Noise (RMS)50nV (10Hz), 90nV (80Hz)
Common Mode Rejection100 dB
Power Supply Rejection100 dB
Analog Supply Voltage (AVDD)2.6V – 5.5V
Digital Supply Voltage (DVDD)2.6V – 5.5V
Regulator Supply (VSUP)2.7V – 5.5V
Operating Temperature-40°C to +85°C (Typical IC Rating)
Module Dimensions25 x 23 x 5 mm
Module Weight3 g

Frequently Asked Questions

What is the purpose of the HX711 module?

The HX711 is a precision 24-bit analog-to-digital converter (ADC) designed specifically to amplify and digitize the small differential voltage output from load cells and strain gauge bridges. It converts the analog signal into a high-resolution digital output that microcontrollers like Arduino can easily read, simplifying the design of accurate weighing systems.

How do I connect a load cell to the HX711 module?

A typical 4-wire load cell (Excitation+, Excitation-, Signal+, Signal-) connects directly to the HX711's input pins. The red and black wires (Excitation) connect to the E+ and E- terminals, while the green and white wires (Signal) connect to the A- and A+ inputs for Channel A. The module provides regulated 5V or 3.3V (depending on VCC) to power the load cell bridge.

What is the difference between the 10 SPS and 80 SPS data rates?

The 10 SPS (Samples Per Second) rate offers lower noise and higher effective resolution, ideal for static weight measurements where precision is critical. The 80 SPS rate provides a faster output update, suitable for dynamic weighing or applications requiring quicker response, but with slightly higher noise. The rate is selectable via the module's control pins.

Can the HX711 module work with 3.3V microcontrollers like ESP32?

Yes. The HX711 operates from 2.6V to 5.5V, making it fully compatible with both 3.3V and 5V logic systems. When powered by 3.3V, ensure your load cell's excitation voltage (provided by the module's regulator) is sufficient, and note that the full-scale input voltage range will scale proportionally with the supply voltage (AVDD).

Does the module require calibration with my load cell?

Yes, calibration is necessary to establish the relationship between the HX711's digital output counts and the actual weight applied. This involves taking readings with known weights (e.g., zero load and a known calibration weight) to calculate a calibration factor or scale, which is then used in your microcontroller code to convert raw ADC values into accurate weight measurements.

Package Includes

  • 1 x 7Semi HX711 Load Cell Amplifier Module
  • 2 x Header Pin Strips

Additional Information

Weight 0.003 kg
Dimensions 2.3 × 2.5 × 0.5 cm

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