khaledsamymohamed / stop_watch

Design a Stop Watch system using ATmega32 Microcontroller (1MHz) with Timer1 in CTC mode for time counting. Utilize six Common Anode 7-segments through multiplexing with a 7447 decoder and NPN BJT transistors. Implement start, pause, and resume functions using External Interrupts (INT0, INT1, INT2) triggered by push buttons.

Stop Watch System

Overview

This project implements a Stop Watch system using the ATmega32 Microcontroller with a 1MHz frequency. It utilizes Timer1 in CTC mode for precise time counting and features a display system using six Common Anode 7-segments through multiplexing with a 7447 decoder and NPN BJT transistors.

Hardware Setup

• Connect the 7447 decoder to the first 4 pins in PORTC.
• Use the first 6 pins in PORTA as enable/disable pins for the six 7-segments.
• Implement multiplexing technique for displaying time on the 7-segment displays.

Stopwatch Controls

• Start the stopwatch automatically upon connecting power to the MCU.
• Connect a push button with an internal pull-up resistor to trigger External Interrupt INT0 (falling edge) for resetting the stopwatch.
• Connect a push button with an external pull-down resistor to trigger External Interrupt INT1 (rising edge) for pausing the stopwatch.
• Connect a push button with an internal pull-up resistor to trigger External Interrupt INT2 (falling edge) for resuming the stopwatch.

Timer Configuration

Configure Timer1 in CTC mode for accurate timekeeping.

Notes

• The project is designed for the ATmega32 Microcontroller with a 1MHz frequency.
• Utilize the provided circuit diagram for proper connection of 7-segments and control elements.