HX711 Weight / Load Cell 2 Channel Pressure Sensor Amplifier Module for Arduino / DIY / PIC

The Envistia HX711 Load Cell Amplifier Module 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. Whether you're building a digital kitchen scale, an automated dispensing system, or an IoT-connected smart scale, the HX711 makes it easy — just two wires to your microcontroller and a free Arduino library.

⭐ Key Features & Benefits

• 24-bit precision — Delivers highly accurate weight readings suitable for gram-level measurement
• 2-wire interface — Connect with just DOUT and SCK to any two GPIO pins; no SPI/I2C bus conflicts
• Two input channels — Channel A (gain 64 or 128) for your primary load cell, plus Channel B (gain 32) for a second sensor
• Built-in voltage 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 — Well-supported Arduino library (bogde/HX711) with calibration examples included

📐 Specifications

📦 What's in the Box

• 1× HX711 Load Cell Amplifier Module
• Header pins (Included for soldering)

📝 Note: Load cell / strain gauge sensor is not included and must be purchased separately. This module works with standard 4-wire strain gauge load cells of any capacity (1kg, 5kg, 10kg, 20kg, 50kg, etc.).

🔌 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

🎯 Common Applications

• Digital scales — Kitchen scales, postal scales, jewelry scales
• Industrial weighing — Process control, automated filling, dispensing systems
• IoT smart scales — Wi-Fi connected scales with ESP32/ESP8266 and cloud dashboards
• Presence & occupancy detection — Detect whether an object or person is on a surface
• Agricultural monitoring — Beehive weight tracking, feed bin levels, crop yield measurement
• Force & strain measurement — Tension testing, compression testing, structural monitoring

🚀 Getting Started

Setting up the HX711 is straightforward:

1. Connect your load cell's four wires to the HX711 module (Red→E+, Black→E-, White→A-, Green→A+)
2. Wire the HX711's digital side to your Arduino (DT, SCK, VCC, GND — just 4 connections)
3. Install the free HX711 Arduino library by bogde from the Library Manager
4. Run the calibration sketch with a known weight to find your calibration factor
5. Start weighing!

💡 Tip: See our complete HX711 User Guide for detailed wiring diagrams, pinout tables, calibration walkthrough, sample code, and troubleshooting tips.

🛒 You May Also Need

• Strain Gauge Load Cells (various capacities)
• Arduino Uno / Nano Development Boards
• 0.96" OLED Display Module (SSD1306, I2C)
• Breadboard & Jumper Wire Kits

📄 Documentation & Resources

• User Manual & Hookup Guide
• All Sensor, Detector & Input Module Guides