This paper presents a cost-effective and accurate weight measurement system utilizing a strain gauge, Wheatstone bridge configuration, and an Arduino microcontroller. The strain gauge, attached to a bending beam, detects the deformation caused by applied weight, which is then translated into a change in resistance. This resistance variation is converted into a voltage signal using a Wheatstone bridge circuit and amplified to a level suitable for the Arduino’s analog input. The Arduino microcontroller processes the analog signal, applies calibration factors, and displays the weight measurement on a connected display. The system’s performance is evaluated through experimental testing, demonstrating its reliability and suitability for various weight measurement applications requiring affordability and ease of implementation.
Introduction
1. Origin of the Strain Gauge
Invented in 1938 independently by:
Edward E. Simmons (Caltech) – to measure stress in metals.
Arthur C. Ruge (MIT) – for earthquake research in water tanks.
Their invention laid the foundation for modern electronic weight measurement.
Practical weight applications evolved over time with contributions from many.
2. Strain Gauge Fundamentals
A strain gauge measures deformation in a material.
Key principle: Resistance changes as a material stretches or compresses.
Temperature Compensation (to correct environmental effects)
Secure Mounting (for repeatable results)
Linearity and Resolution (check across range)
Conclusion
This project successfully demonstrates the feasibility and effectiveness of using a strain gauge, Wheatstone bridge, and Arduino microcontroller to create a costefficient and accurate weight measurement system. The experimental results confirm the system’s high linearity and accuracy within [Specific percentage or range of error], proving its reliability for practical applications. Furthermore, the simplicity of the design and the ease of implementation highlight its potential for use in diverse scenarios requiring affordable and customizable weight measurement solutions, such as in educational settings, DIY projects, and small-scale industrial applications.The integration of readily available components and the open-source nature of the Arduino platform contribute to the system’s accessibility, allowing for further development and adaptation to specific user needs. Ki
References
Sensors and Transducers by D. Patranabis Electronic Devices and Circuit Theory by Robert Boylestad and Louis Nashelsky Programming Arduino: Getting Started with Sketches by Simon Monk Measurement Systems: Application and Design by Ernest O. Doebelin Getting Started with Arduino by Massimo Banzi and Michael Shiloh