Designing a Calculator Using 8051 Microcontroller

This project demonstrates the implementation of a basic calculator using an 8051 microcontroller. The calculator performs arithmetic operations—addition, subtraction, multiplication, and division. The inputs are provided through a 4x4 keypad, and results are displayed on an LCD screen.

Features

• Arithmetic Operations: Performs addition, subtraction, multiplication, and division of two numbers.
• Keypad Input: User-friendly interface using a 4x4 keypad for input.
• LCD Display: Results are displayed in real-time on a standard 16x2 LCD.
• Memory Utilization: Stores inputs and results in dedicated memory locations within the microcontroller.
• Simulation and Coding: Circuit designed in Proteus, and the code developed using MIDE-51 IDE.

Implementation Details

8051 Microcontroller:

• Controls the keypad, processes inputs, executes arithmetic operations, and displays the output.

  Keypad Scanning:

• Continuously scans the 4x4 keypad matrix to detect pressed keys and identify inputs.

  LCD Integration:

• Displays inputs, operations, and results in ASCII format on a 16x2 LCD module.

  Proteus Simulation:

• Circuit simulated in Proteus software, ensuring proper functionality before hardware implementation.

  Code Compilation:

• Program written in Assembly language using MIDE-51 IDE, converted into a .hex file, and uploaded to the microcontroller.

Challenges Faced

• Limited memory and 8-bit register size, restricting operations to values ≤ 255.
• Difficulties in handling division outputs for numbers exceeding the 8-bit range.
• Converting large hexadecimal outputs to decimal format.

Future Prospects

• Expanding functionality to handle floating-point operations.
• Optimizing the algorithm to support larger numbers and advanced operations.
• Transitioning to a more advanced microcontroller for enhanced capabilities.

Project Report

Download the full project report (PDF)