ESP32-Based Digital Weighing Scale Using 50kg Load Cell, HX711 Module and 16x2 LCD Display

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 ESP32 Digital Weighing Scale using 50kg Load Cell & HX711

The ESP32 Digital Weighing Scale Project is a compact, battery-powered smart measurement system designed for accurate and real-time weight monitoring. Built using the powerful ESP32-WROOM-32 and the precision-based HX711, this system delivers high-accuracy readings displayed on a 16x2 LCD with I2C interface.

It is ideal for IoT applications, smart automation systems, and portable digital weighing solutions.

 Project Overview

This smart weighing system includes:

  •  ESP32-WROOM-32 Development Board

  •  50kg Load Cell Sensor

  •  HX711 Load Cell Amplifier Module

  •  16x2 LCD Display with I2C Module

  •  3.7V Li-ion (18650) Battery

  •  Rocker Switch for Power Control

  •  Resistors and Connecting Wires

The system ensures accurate measurement, low power consumption, and optional wireless connectivity for future IoT expansion.

 Working Principle

1️⃣ Load Detection

The 50kg load cell uses strain gauges to convert applied force into a small analog voltage signal.

2️⃣ Signal Amplification & Conversion

The HX711:

  • Amplifies the millivolt-level signal

  • Converts it into high-resolution 24-bit digital data

  • Sends digital readings to the ESP32

This ensures stable and precise measurement.

3️⃣ Data Processing (ESP32)

The ESP32-WROOM-32:

  • Reads data from HX711

  • Applies calibration factor

  • Converts readings into kilograms or grams

  • Sends the result to the LCD display

4️⃣ Real-Time LCD Display

The 16x2 LCD with I2C interface:

  • Displays live weight readings

  • Shows system status messages

  • Reduces wiring complexity using I2C protocol

5️⃣ Power Management

  • Powered by a 3.7V 18650 lithium battery

  • Rocker switch provides ON/OFF control

  • Low-power design suitable for portable operation

  • Can be extended with battery voltage monitoring

 Key Features

✔ High-precision 24-bit measurement
✔ ESP32-based intelligent processing
✔ Real-time LCD output
✔ Portable and battery-powered
✔ Expandable for Wi-Fi cloud monitoring
✔ Compact and energy-efficient design
✔ Suitable for industrial and IoT use

 Technical Concepts Demonstrated

  • Load cell strain gauge operation

  • 24-bit ADC interfacing

  • ESP32 GPIO communication

  • I2C protocol for LCD

  • Sensor calibration techniques

  • Embedded power system design

  • Portable IoT device architecture

 Applications

 Digital weighing scale systems
 Smart kitchen scale
 Industrial load monitoring prototypes
 Smart inventory management
 IoT-based weight tracking systems
 Embedded systems learning projects

 Possible Enhancements

You can upgrade this system with:

 Wi-Fi data upload to cloud platforms
 IoT dashboard integration (ThingSpeak, Blynk)
 Mobile app monitoring
 Battery level display on LCD
 Data logging to SD card
 Weight threshold alert system

 Conclusion

The ESP32 50kg Load Cell Digital Weighing Machine combines:

  • High-accuracy sensing

  • Advanced signal amplification

  • Smart microcontroller processing

  • Portable battery operation

  • Expandable IoT capability

It is an excellent project for students, makers, IoT developers, and automation engineers looking to build a reliable, portable, and smart weight measurement system.

Code:
/*
 * Arduino Sketch for 18650 Battery Holder
 * This code manages the power supply for the ESP32-based digital weighing
 * scale project. It ensures the battery is connected and provides power
 * to the circuit. The Rocker Switch is used to turn the power on or off.
 */

void setup() {
  // Initialize serial communication for debugging
  Serial.begin(115200);
  Serial.println("Battery Holder Setup Complete");
}

void loop() {
  // Check if the battery is connected
  if (isBatteryConnected()) {
    Serial.println("Battery is connected.");
  } else {
    Serial.println("Battery is not connected.");
  }
 
  // Add any additional power management code here
 
  delay(1000); // Wait for 1 second before checking again
}

bool isBatteryConnected() {
  // Placeholder function to check battery connection
  // Implement actual battery connection check logic here
  return true; // Assume battery is always connected for this example
}

 Applications

  • Digital weighing scale projects

  • IoT-based weight monitoring systems

  • Smart kitchen scale

  • Industrial load measurement prototypes

  • Embedded systems sensor interfacing projects

This ESP32 Load Cell Digital Weighing Machine is perfect for students, makers, and IoT developers looking to build an accurate, portable, and smart weight measurement system.

 

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