Design of Weight Health Management System Based on WeChat Platform

With the advancement of electronic weighing technology, electronic scales have gradually replaced traditional weighing devices. Thanks to their ease of use, accurate measurements, compact size, fast response time, and convenient readability, they are widely used in commercial trade, hospitals, schools, and enterprises. As manufacturing techniques improve, electronic scales are becoming lighter and more portable, making them a common household item. Additionally, as people become increasingly conscious of their body shape and health, the demand for weight monitoring has grown. With the rise of the Internet of Things (IoT) and the development of WeChat technology, it's natural that IoT systems will leverage the WeChat platform more and more. This article introduces a weight management system built on the WeChat platform. Not only does it measure weight, but it also helps users track their weight changes over time. By integrating with WeChat, the system offers a more interactive and user-friendly experience, making it more intelligent and human-centered. **1. Overall System Architecture Design** The system is centered around the STM32 microcontroller, with the hardware part using a differential full-bridge circuit based on resistance strain gauges. The A/D conversion module uses the HX711 chip. Beyond basic weight measurement, the system includes data storage and analysis features integrated with the WeChat platform and the WiFi cloud. It allows users to store and analyze their weight data, receive feedback through WeChat, and even control the physical scale via the app.  *Figure 1: Block diagram of the overall system architecture* **2. Load Cell Design** **2.1 Resistance Strain Gauge Sensor** The core function of the weight management system is to measure body weight. Therefore, the load cell is one of the most critical components, as its performance directly affects the accuracy and stability of the electronic scale. To ensure precision, the system employs a differential full-bridge circuit made up of four identical strain gauges. As shown in Figure 2, when force is applied, the output voltage of the unbalanced bridge is:  When R1 = R2 = R3 = R4 and ΔR1 = ΔR2 = ΔR3 = ΔR4 under load, the output voltage U0 is linearly proportional to ΔR/R. This configuration provides high sensitivity and temperature compensation, making it ideal for accurate weight measurement.  *Figure 2: Differential full-bridge circuit*

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