Here is a ST Voyager antigen bomb from episode 'Macrocosm'. Use potentiometer to set how many minutes you wish to count down. Once ready press push button to start the countdown. When count down is finished 3 x red LED's will start flashing (changing frequency every few seconds). [I will be adding buzzer too in next few days].
The full component list is in the text file and arduino code and library for 7 seg display are there too.
Any questions or comments are welcome \//
Physics, 3D printing, Programming, Astronomy and Sci-fi - that's me \//