Just a little hardware to be used for stopwatches, timing, clocks, light dimming etc. Very simple circuit! Just four little components added to your supply! The code I did not include here, but I'm sure every expert and beginner can come up with something... show me ;)
The schematic is made with Orcad Capture lite, you'll probably need this or a supported viewer.
(There's also a printout included)
For questions, try mailing firstname.lastname@example.org
PS: Don't forget to enable the internal pullup! (or use an external one)