Arduino UNO Calculator

A feature-rich scientific calculator implementation for Arduino UNO. This project implements a calculator with basic arithmetic operations, trigonometric functions, and logarithmic calculations using an Arduino UNO microcontroller, LCD display, and a keypad interface.

Features

• Basic arithmetic operations:

  • Addition (+)
  • Subtraction (-)
  • Multiplication (*)
  • Division (/)
  • Exponentiation (^)

• Scientific functions:

  • Sine (sin)
  • Cosine (cos)
  • Tangent (tan)
  • Natural logarithm (ln)

• Additional features:

  • Decimal point support
  • Negative number support
  • Backspace functionality
  • Clear function
  • Shift key for accessing scientific functions
  • Real-time display on LCD

Hardware Requirements

• Arduino UNO board
• 16x2 LCD Display (HD44780 compatible)
• Matrix Keypad (5x4)
• Connecting wires
• Power supply

Pin Configuration

LCD Display

• RS: PB0
• E: PB1
• D4: PB2
• D5: PB3
• D6: PB4
• D7: PB5

Keypad

• Rows: PC0-PC3 (outputs)
• Columns: PD3-PD7 (inputs with pull-up)

Keypad Layout

| 0 | . | ^ | s | = |
| 1 | 2 | 3 | + | - |
| 4 | 5 | 6 | * | / |
| 7 | 8 | 9 | b | c |

Where:

• 's' is the shift key for accessing scientific functions
• 'b' is backspace
• 'c' is clear

Project Structure

Hardware_Calculator/
├── Calculator Codes/        # Main calculator implementation
│   ├── Keypad.h            # Keypad interface handling
│   ├── LCD.h              # LCD display functions
│   └── main.c             # Main program logic
├── LCD Display Control/    # LCD testing and control
└── Test/                  # Test implementations

Usage Instructions

1. Power on the calculator

2. For basic operations:

   • Enter first number
   • Press operation key (+, -, *, /, ^)
   • Enter second number
   • Press = to see result

3. For scientific functions:

   • Press 's' (shift)
   • Press corresponding number key:
     • 1: sin
     • 2: cos
     • 3: tan
     • 4: ln
   • Enter the value
   • Press = to see result

4. Additional functions:

   • 'c': Clear display and memory
   • 'b': Backspace (delete last digit)
   • '-' as first input: Negative number

Build Instructions

1. Clone this repository
2. Connect the hardware components according to the pin configuration
3. Compile and upload the code using Arduino IDE or avr-gcc
4. Refer to the Makefile in each directory for specific build commands

Contributing

Feel free to submit issues and enhancement requests.

Author

ArunSakthiAnandM