I'm trying to make airsoft bomb, the bomb should have a timer of 90 minutes and 60 seconds (4 digit 7 segment display two for minutes and two for second), should have one push button to adjust the length of the game ,When i turn on the bomb it should start counting down from 10 minutes to 0 , but when I press the button once to go 20 minutes, if i press button twice then 30 minutes , if thrice then from 40 , , and so on until 90.
when it comes to 0 should turned on the siren and should have one push button for stopping, when i press to stop the countdown and when I press it again to resume countdown
Thanks for the help, if you could create a code I would be grateful.
i have four seven segment display arduino uno and shift register cd4094be
thanks a lot
Wait - you are not trying at all... you want someone to do it for you...
90 minutes and 60 seconds
That's 91 minutes.... 
Participants here rarely create code on the specs of others - we tend to be willing to help people learn and fix their bugs. If you want to pay someone to do it, you can go to the gigs and collaboration section of the forum.
For what you want to do there are plenty examples on line... study, learn, build something. You'll see it's very rewarding.