Egg timer

A TM1637 display (CLK GPIO23, DIO GPIO24, 3.3 V) counts down from 1 minute 5 seconds, shown as MM:SS with the colon lit and leading zeros: 01:05, 01:04, … 01:00, 00:59… One step per second, starting at 01:05 at 0 s.

Tip: divmod(seconds, 60) splits seconds into minutes and seconds.