RasPi or 555 Timer?
I like this new MAKE article which shows 2 ways to build an alarm: Raspberry Pi or two 555 timers. These days most everyone reaches for a micro to build every project but that's overkill in many situations. I still relish any opportunity to use the 50-year old 555 timer. First time recently I can recall that a major publication advocated using analog chips, even as an alternate solution. Maybe they're ripe for a comeback, along with vinyl & vacuum tubes!