I make this micro controller based timer as a part of shooter training Project.we can select and set time for a period of 0 t0 99 seconds or minutes. when the the timer is start.the 2 seven segment display start counting down .when it reach 0 an out put voltage activate buzzer or relay .so any electrical device can be switched on or off after a time delay
¶Microcontroller based design for greater accuracy and control
¶Power supply input 12 VDC 200 mA
¶Two 7 segments Display to display time
¶Single key start and dual key alarm time set function
¶Power and Relay-On LED indicator
¶Terminal connector for connecting power supply input and relay output to the PCB
¶Onboard regulator for regulated supply
¶Crystal resonator based design for better accuracy
there three buttons Up Down and set button
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