Blinky Timer

youmagine

This is a timer that blinks green for a set amount of time, then yellow, finally red when you press a recessed button. The face of the timer displays the total time printed right into it. (You can use STL, or go into OpenSCAD and substitute the number/text of your choosing.) It runs on a lithium 3V coin cell and should last for hundreds of cycles (deep sleep between activations). The timer program uses the internal clock of the ATTiny85 chip, which is not extremely accurate but very repeatable, so you'll need to adjust the delay numbers to get your version most accurate. You can also print a new faceplate and program for a different time. Additionally included: A Fritzing file for connections and making a PCB if you decide to do that. (I'm planning an order from Osh Park because soldering the perfboard version is really a pain.)