All you need to do is give it 5 volts DC, ... minutes, or seconds, and a button to kick the whole thing off. When the counter ... 5 thoughts on “ Rotary Phone Lives On As Arduino Kitchen Timer ” ...

Runner and Arduino enthusiast Nikodem Bartnik has created a DIY 100m sprint timer which is placed at the finish line and signals the start of timing via an audible bleep from its integrated speaker.