HX711 Load Cell Amplifier Module – 24-Bit High-Precision ADC for Arduino Weight & Force Measurement

The HX711 is a precision 24-bit analog-to-digital converter breakout board designed to read strain gauge load cells and convert force into accurate digital weight measurements. It communicates with any microcontroller through a simple 2-wire serial interface (DOUT and SCK) -- no SPI or I2C bus required -- and a free, well-documented Arduino library handles calibration and unit conversion.

⚠️ Module Only -- Load cell / strain gauge sensor is NOT included. This module works with any standard 4-wire strain gauge load cell (1kg, 5kg, 10kg, 20kg, 50kg, etc.). One-time calibration with a known weight is required for accurate readings.

🔧 How It Works

1. A load cell converts applied force (weight) into a tiny change in electrical resistance
2. The HX711 amplifies this signal using a programmable gain amplifier (32×, 64×, or 128×)
3. Its built-in 24-bit ADC converts the amplified signal into a precise digital value
4. Your microcontroller reads the value through two GPIO pins (DOUT and SCK) using the free HX711 library, which converts it into grams, kilograms, or any unit you choose

⚡ Key Features

• 24-Bit Precision: Highly accurate weight readings suitable for gram-level measurement
• Simple 2-Wire Interface: Just DOUT and SCK to any GPIO pins -- no SPI/I2C bus conflicts
• Dual Input Channels: Channel A (gain 64/128) for your primary load cell, plus Channel B (gain 32) for a second sensor
• Built-In Regulator & Oscillator: No external crystal or power regulator needed -- fewer parts, simpler builds
• Wide Voltage Range: 2.6V – 5.5V works with both 3.3V and 5V microcontrollers out of the box
• Ultra-Low Power: Under 1.5mA active, under 1µA in power-down mode -- ideal for battery-powered projects
• 50Hz/60Hz Noise Rejection: Clean readings regardless of your country's power grid frequency
• Beginner-Friendly: Free Arduino library (bogde/HX711) with calibration examples and extensive documentation

📐 Specifications

📦 What's in the Box

• 1x HX711 Load Cell Amplifier Module
• 1x Set of header pins (included for soldering)

Load cell, Arduino, jumper wires, and USB cable are not included.

🛒 What You'll Need

• Strain gauge load cell -- any capacity (1kg–50kg), sold separately
• Arduino or compatible microcontroller -- Uno, Nano, Mega, ESP32, etc.
• Jumper wires -- for connecting the module to your microcontroller
• USB cable -- for programming your Arduino
• A known weight for calibration -- e.g., a bag of sugar, a dumbbell, or calibration weight

🔌 Compatible With

• Arduino Uno / Nano / Mega / Leonardo / Due
• ESP32 / ESP8266 (3.3V compatible)
• Raspberry Pi (with appropriate library)
• STM32 and other 3.3V / 5V microcontrollers
• Any standard 4-wire strain gauge load cell (any capacity)

🎯 Typical Applications

• DIY digital kitchen, postal, and jewelry scales
• Industrial weighing and process control
• Automated filling and dispensing systems
• Presence and occupancy detection
• IoT smart scales (ESP32/ESP8266 + cloud dashboards)
• Agricultural monitoring (beehive weight, feed bin levels)
• Force and strain measurement (tension/compression testing)

🚀 Quick Setup

1. Connect load cell wires to the HX711: Red→E+, Black→E-, White→A-, Green→A+
2. Connect HX711 to Arduino: DT→any digital pin, SCK→any digital pin, VCC→5V, GND→GND
3. Install the free HX711 library by bogde in the Arduino IDE (Library Manager)
4. Upload the calibration sketch, place a known weight, and note your calibration factor
5. Upload the weighing sketch with your calibration factor -- start weighing!

💡 Tip: For the most stable readings, solder all connections (avoid breadboards), use short wires, and allow 15–30 minutes of warm-up time before precision measurements. Full wiring diagrams, sample code, and troubleshooting guides are available at the Envistia Mall product support website.

⚠️ Important Notes

• Load cell is not included -- must be purchased separately
• One-time calibration with a known weight is required for accurate readings
• Do not exceed the load cell's rated capacity -- overloading causes permanent damage
• Some load cells use different wire color conventions -- always check your load cell's documentation
• If readings are negative, swap the White (A-) and Green (A+) wires
• This module is for hobbyist and prototyping use -- not certified for commercial trade weighing

🏪 About Envistia Mall

Envistia Mall is a US-based electronics retailer specializing in development boards, sensors, modules, and components for makers, engineers, and educators. We ship from the United States with fast handling times. Product documentation and technical support are available at our dedicated support site.

📦 Fast Free US Shipping  |  🔄 Hassle-Free Returns  |  📧 Responsive Customer Support

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