HX711 with a Four Wire Load Cell and Arduino | Step by Step Guide.

In this video, the presenter demonstrates how to create a simple scale using a four-wire Load Cell, the HX711 Amplifier module, and an Arduino. The tutorial focuses on a 20 kg Load Cell, contrasting it with a previous tutorial that used a three-wire Load Cell. The four-wire Load Cell features a full Wheatstone bridge, while the three-wire model only has a half-bridge configuration.

Key Technological Concepts Discussed

• Load Cell Functionality: The Load Cell contains four strain gauges that respond to applied force by compressing and stretching, creating a voltage difference that is measurable.
• HX711 Amplifier: This module amplifies the tiny voltage changes from the Load Cell, making them readable by the Arduino.

Product Features

• The load cells come in various weight ratings, from 1 kg to several hundred kilograms.
• The HX711 Amplifier is essential for converting the small voltage changes into a usable format for the Arduino.

Step-by-Step Guide

1. Wiring: The presenter explains how to connect the Load Cell to the HX711 module, emphasizing the importance of verifying wire connections.
2. Arduino Setup: Instructions are provided for connecting the HX711 to the Arduino, including pin connections and downloading the necessary "HX711_ADC" library.
3. Calibration: The calibration process is demonstrated, including how to save calibration values to EEPROM to avoid recalibration on every startup.
4. Example Code: The video walks through loading example code to read from the Load Cell and how to adjust it for different pin configurations.

The presenter also mentions the possibility of integrating a display to create a fully functional scale, referencing a previous project involving a PCB and a 1.8-inch screen.

Main Speaker

The video is presented by an unnamed individual who provides a clear and detailed tutorial on using the HX711 and Load Cell with Arduino.