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Minimum Viable Arduino Project: Aeropress Timer

(netninja.com)
44 points surprisetalk | 4 comments | 02 Dec 25 18:48 UTC | HN request time: 0.225s | source
1. jacknews ◴[08 Dec 25 01:54 UTC] No.46187432[source]▶
555
replies(2): >>46187865 #>>46204102 #
2. notpushkin ◴[08 Dec 25 03:07 UTC] No.46187865[source]▶
Came in for this joke.
3. ErroneousBosh ◴[09 Dec 25 12:16 UTC] No.46204102[source]▶
You can't use a 555, obviously.

You need to use two of them, or a 556, because you need one half for the 30 second monostable and the other half for the astable that drives the beeper.

Out of contrariness I'd use a CD4011 though.

replies(1): >>46205362 #
4. jacknews ◴[09 Dec 25 14:39 UTC] No.46205362[source]▶
You're right, but I think a 555 is maybe more than required for the buzzer.

Buzz-overkill, if you like.