The HX711 is a 24-bit precision analog-to-digital converter (ADC) commonly used for weighing scales and load cell applications. It is designed specifically to work with bridge sensors such as strain gauge load cells, making it ideal for electronic weighing machines, force measurement devices, and other precision sensing systems. 🔹 Key Features Resolution: 24-bit ADC for high precision. Low noise: Designed for stable weight measurement. Interface: Works with microcontrollers via a 2-wire serial interface (DT & SCK). Input channels: Two differential input channels: Channel A (high precision, gain selectable: 128 or 64). Channel B (lower precision, fixed gain: 32). Operating Voltage: 2.7V – 5V (commonly powered by 5V). Current Consumption: ~1.5 mA (normal mode). On-chip clock generator → eliminates need for external oscillator. 🔹 Pin Configuration VCC → Power supply (2.7V–5V, usually 5V). GND → Ground. DT (Data) → Serial data output to microcontroller. SCK (Serial Clock) → Clock input from microcontroller. E+ / E- → Excitation voltage for load cell (positive & negative). A+ / A- → Differential input channel A (connect to load cell). B+ / B- → Differential input channel B (optional, lower gain). 🔹 How It Works A load cell (strain gauge bridge sensor) changes resistance when weight/force is applied. This resistance change creates a small analog voltage signal (in millivolts). The HX711 amplifies this weak signal (by 32, 64, or 128 times). The built-in 24-bit ADC converts the amplified analog signal into a digital value. The microcontroller (Arduino, ESP32, etc.) reads this digital data via DT & SCK pins. The value can then be calibrated to show weight in grams, kilograms, or newtons. 🔹 Applications Digital weighing scales. Smart kitchen scales. Industrial weight measurement. Force sensors (robotics, automation). IoT-based monitoring systems. 🔹 Advantages High precision (24-bit resolution). Low-cost solution for load cell interfacing. Simple 2-wire communication. No need for external amplifier or precision ADC.