Here is code for an Airsoft Bomb using Arduino!

Every startup or reset:

• choose 4-pin passcode
• set timedown in hours ( confirm by pressing '#' )
• set timedown in seconds ( confirm by pressing '#' )

The relay will close for the match,scourer or whatever you will use to ignite the smoke bomb, if:

• Wrong pin entered 3 times
• Someone opened the bomb front panel
• Someone cut the wires for the smoke bomb

For reset or defuse you can use the key switch!

and i know, it's a mess, but hey! it works :D