The solution is hardware . A simple RC low-pass filter (Page 42 of the handbook) cleans sensor jitter better than 100 lines of code. A Schmitt trigger (Page 101) fixes slow button edges instantly. These 1001 circuits are the "hardware algorithms" that software cannot replace.
Uses a 555 and a CMOS 4017 decade counter to achieve timing from 1 second to over 10 minutes without large electrolytic capacitors. Schematic: 555 in astable mode driving 4017 clock input. Q1 output of 4017 triggers a transistor. Parts: 555, 4017, 2N3904, 1M pot, 0.1 µF cap, 10 µF cap. Notes: R1 sets 555 frequency; divide-by-10 increases max delay. For delays >30 min, cascade another 4017. The solution is hardware
(edited by Michael L. Fair) is the deep-dive sequel you didn't know you needed. Originally published by These 1001 circuits are the "hardware algorithms" that