This project implements a Stop Watch system based on the ATmega32 microcontroller, operating at a frequency of 1MHz. The system incorporates Timer1 in CTC mode for precise time measurement and utilizes six Common Anode 7-segment displays arranged in a multiplexed configuration.
- Microcontroller: ATmega32 operating at 1MHz.
- Timer Configuration: Timer1 configured in CTC mode for accurate timekeeping.
- Display: Six Common Anode 7-segment displays using multiplexed technique.
- Each 7-segment display is controlled by a 7447 decoder and a NPN BJT transistor for enable/disable.
- Multiplexing method is employed, allowing one display to be driven at a time for a seamless appearance.
- Port Connections:
- 7447 decoder connected to the first 4 pins in PORTC.
- First 6 pins in PORTA used as enable/disable pins for the six 7-segments.
- User Controls:
- Start: Stopwatch begins counting upon connecting power to the MCU.
- Reset: External Interrupt INT0 with falling edge detects a button press, resetting the stopwatch time.
- Pause: External Interrupt INT1 with rising edge detects a button press, pausing the stopwatch time.
- Resume: External Interrupt INT2 with falling edge detects a button press, resuming the stopwatch time.
- Buttons:
- Connected with appropriate pull-up/pull-down resistors based on the specified requirements.
- Connection Example:
- Refer to the provided image for a visual representation of the main 7-segment display setup.
- Refer to the provided image for a visual representation of the main 7-segment display setup.
Note
The image is for illustration purposes only. Replace the depicted IC with a common anode decoder 7447 in the actual setup.
- Reference Image:
- For a detailed view of the 7-segment display, consult the provided image.
- For a detailed view of the 7-segment display, consult the provided image.
