Arduino based Weighing Machine

Project Description:

1. Arduino Uno R3: It is a microcontroller board based on the ATmega328P which has 14 digital input/output pins, 6 analog inputs, a 16 MHz quartz crystal, a USB connection, a power jack, an ICSP header and a reset button. It contains everything needed to support the microcontroller.
2. 16*2 Alphanumeric LCD: It is used to display the calculated average load cell value.A 16x2 LCD means it can display 16 characters per line and there are 2 such lines. In this LCD each character is displayed in 5x7 pixel matrix. This LCD has two registers, namely, Command and Data.
3. HX711 Module: A precise 24 bit analog to digital converter designed for weighing scales and industrial control applications to interface directly with a bridge sensor.
4. Load Cell: It is a strain gauge which converts pressure into electrical signals.

Project Implementation:

1. Make the correct connections between load cell and HX711 by connecting RBWG wires to E+ E- A- A+ Pin.
2. The output of HX711 is connected to Arduino pin D3 and D2.
3. Use the alphanumeric 16*2 LCD screen at 4-bit mode.
4. For more accuracy add another load cell and take the average of the result.
5. Write a code in arduino which includes header file for all the components and take average of the readings and display on the LCD screen.

Software requirements:

1. Arduino IDE: Coding and uploading is simple and is compatible with Windows, Linux and Mac OS X.

• Arduino
• Load cells

• Arduino