A year ago, I started a topic asking for help about a similar project. As of today, I couldn't manage myself to get this code running, so I'm back here asking for help again :blush:
I've changed a few things form the original project (no longer use of keyboard and LCD). The basic thing of this will be something like this: Once the Arduino is turned on, every 5 seconds a leed blinks and a beep sounds. If the button "A" is pressed, the bomb gets armed. Cool, I've got it til this point. When the button is pressed the device should start a countdown timer for X minutes, then go off(playing a long tone or something like that). To defuse the bomb before the time ends, the other team has to cut the right wires on the device, but if they cut any wrong wire, the "bomb" goes off instantly.
Here is the problem: I don't know how to make the timer stoppable.
Thanks to everybody XD