Hello world! Today i made a simple time bomb with a 4 digit 7 segment Display (product number:KYX 5461AS). It is very simple and again can be used for multiple things of course! You trigger it with a button, it will reset automatically using watchog. avr/wdt.h library. Follow the next step for the code Schematic & parts list.
I am not responsible for any other uses!
You can make a bomb with a motion sensor to, this is not what it is about. Its for fun recreational and educational use.
Just wire it up like the Schematic and it should work after uploading the code!
If not!? You need to install the avr/wdt.h Library, But most likely you don't have to because it comes with Arduino IDE. It's the library we use to reset the Time Bomb (watchdog) See more info here how to use Watchdog.
Parts list.
Good luck!