Digital Countdown Timer (AT89C2051)

A simple count-down LED timer that counts in minutes and seconds. Three buttons below the LED provide control of the unit, allowing you set the desired countdown time in minutes and seconds and a start/stop button.
Completion of the countdown is indicated by an alarm that starts when the countdown has finished and the display reads zero.
The alarm is stopped by pressing the start/stop button.

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Circuit Diagram:


Download the Source code from here: