Published on April 11, 2015
This circuit is like an "Itty Bitty Book Light" with a timer. It displays how many minutes have already passed, and the long led stays on until the set reading time is finished. Now there's no more reason for Jack to keep asking me if his 20 minute reading time is done. :)
The trick with this circuit is to combine the timeout (set to one minute) with the Number and threshold (set to value 21).