How To Make Digital Weighing Scale Using Arduino

Introduction

Digital weighing scales are rapidly gaining popularity in today’s world due to their accuracy, convenience, and versatility. They are widely used in various industries such as food and beverage, pharmaceuticals, and logistics, among others. However, most digital weighing scales available in the market are quite expensive, and not everyone can afford to purchase them. For this reason, you can use an Arduino board to build your digital weighing scale at home at a relatively low cost.

An Arduino board is an open-source electronics platform that allows you to create interactive electronic projects. You can use it to build various projects, including digital weighing scales. This article provides a detailed guide on how to make a digital weighing scale using Arduino.

Explanation of How To Make Digital Weighing Scale

Dissecting the Digital Weighing Scale

Before discussing how to build the digital weighing scale, it is essential to understand how it works. A digital weighing scale comprises four main components:

Load Cell HX711 Modules: It is the primary component responsible for converting changes in weight to an electric signal.
Analog to Digital Converter: The Analog to Digital Converter (ADC) is responsible for converting the electric signal from the load cell into a digital signal that the microcontroller can read.
Microcontroller: It is the brain of the weighing scale responsible for processing the digital signal from the load cell and displaying the weight on the scale’s screen. We used Arduino Nano in this project.
Display: It is an essential component of the digital weighing scale that displays the weight measurement. A 16×2 LCD display module is used here.

Working of the project

This weighing scale can display the weight in grams, kilograms, ounces and pounds.
Let see the block diagram of this project. which is displayed above Arduino is the main processing unit of this project. Load Cell is used to measure the weight and ADC module is used to read the signal from load cell and give it to arduino. LCD display is used to display the information. Three push buttons are used to select the mode.

Load Cell converts the mechanical force into the electrical signals. The electrical signal is then amplified and converted into digital siganal. Then it is processed by arduino. Arduino passed the processed information to LCD display to display on the screen.

How To Make Digital Weighing Scale Using Arduino — **Digital Weighing Scale Using Arduino**

Circuit Diagram

of How To Make Digital Weighing Scale

This project can be designed using a few basic components. The circuit diagram of this project is shown below.

How To Make Digital Weighing Scale Circuit Diagram — **Digital Weighing Scale Circuit Diagram**

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**Digital Weighing Scale Block Diagram**

Components List

of How To Make Digital Weighing Scale

Following is the list of all components used in this project:

1x Arduino Nano
1 X HX711 Modules Load Cell
1x 16×2 LCD
1x LOAD CELL
1X BC547 Transistor
3x Push Buttons
1x 1K Ohm Resistor
1x BUZZER
2x 2 Pin Terminal Blocks
JUMPER WIRES

Code & Circuit Diagram:

Gerber File:

Building the Digital Weighing Scale

Step 1: Mounting the Load Cell

The first step in building a digital weighing scale is mounting the load cell sensor onto the breadboard. Connect the load cell’s white and black wires to the HX711 load cell amplifier board’s A+ and A- pins, respectively. You can refer to the load cell’s datasheet to know which wire goes to which pin.

Step 2: Connecting the HX711 Load Cell Amplifier Board to Arduino

Next, connect the HX711 board to the Arduino board using four wires. Connect the HX711 board’s VCC and GND pins to the 5V and GND pins on Arduino, respectively.

Step 3: Adding the LCD Screen

Add the LCD screen to the breadboard and connect it to the Arduino board using the jumper wires. Connect the LCD screen’s VCC and GND pins to the 5V and GND pins on Arduino, respectively. If you are using PCB then just place all components and solder them. The link of Gerber files is provided above.

Step 4: Uploading the Sketch

Before attaching the calibration weight, upload the sketch to the Arduino board. The sketch is a code that tells the Arduino board how to interact with the load cell sensor and display the weight measurement on the LCD screen. You can find the sketch code online or the link is already provided above to download.

Step 5: Calibration

Once the sketch has uploaded, attach the calibration weight to the load cell, and follow the calibration procedure. The calibration will ensure that the weighing scale provides accurate measurements.

Conclusion of How To Make Digital Weighing Scal

How to make a digital weighing scale using Arduino is an exciting and informative project you can do at home. It does not require any significant investment and provides an insight into how digital weighing scales work. The finished product is not only educational but also functional and can be used for small-scale weighing tasks. With this guide, you can comfortably build the digital weighing scale and run precision measurements at home, saving you considerable amounts of money.