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Stopwatch Project

The project consist of a display that contain a 6-digit common anode 7-segment. The seven segments are being interfaced using a 7447 decoder. Atmega32 MCU (with 1Mhz clock ) is used to maintain the clock and the interrupts.

Circuit Digram

Stopwatch Circuit diagram

Main functionalities

  • Multiplexed 6-digit 7-segemnt that display the seconds, minutes and hoours.
  • Pasue de-bounced button using an external interrupt.
  • resume de-bounced button using an external interrupt.
  • Reset de-bounced button using an external interrupt.
  • 7447 Binary to decimal decoder.
  • High persicion second calculation using compare mode using timer 1. w

Project Modulation and Structure

The project has 3 Modules.

  1. clock Module:

    • Time struct.
    • init_time() to initialize a structure of type time to zero.
    • advance_second() to increment a time structure by 1 second.
    • advance_minute() Helper function for advance_second().
    • advance_hour() Helper function for advance_second().
    • display_clock() to display the clock digits from right to left .
    • get_digit() helper function for display_clock() function.
    • all function should return a SUCCESS code or and ERROR code.
    • static function maintain the usability of some functions.

  2. Intterupts module:

    • cotain the configuration functions for all 3 extrnal interrupts.
    • contain all 3 ISRs for the 3 external interrupts.

  3. Timer module:

    • contain the configuration function for timer 1 on ctc mode.
    • Timer_resume() to resume the timer counting.
    • Timer_pasue() to pause the timer counting.
    • Timer_reset() to reset the timer counting to 0.