COUNT DOWN TIMER

[Ali Tamoore]

Can any one tell me how I can change "select"  button to prifix 5 minutes intervel

i e   1 push = 5 min

       2 push =10 min   ….. so on

[Ashutosh Bhatt]

moare details please

which circuit? 

[Ali Tamoore]

Countdown timer using 8051 microcontroller (AT89C51)

http://www.engineersgarage.com/microcontroller/8051projects/countdown-timer-using-AT89C51-circuit

[Ashutosh Bhatt]

yes. you can do. just u have to change the program and add buttons

[Ali Tamoore]

how should i change the program

[Ashutosh Bhatt]

change the delay function.

the delay function given gives fixed delay of 1 sec. you hv to make it variable delay. like it gives 1min, 2min, 5 min….. etc delay

also u hv to change the button functions like when button is pressed delay is increased/decreased

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