Mastodawn

Do smoke detectors have little speakers inside them? If yes, would it be possible to hack them to play a little jingle?

https://piefed.ca/c/nostupidquestions/p/544264/do-smoke-detectors-have-little-speakers-inside-them-if-yes-would-it-be-possible-to-hack-the

Do smoke detectors have little speakers inside them? If yes, would it be possible to hack them to play a little jingle?

I'm asking not specifically about smoke detectors but any device that beeps but does not make any other, non-beeping sounds. Examples include micro…

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Fermion Feb 23

labdarna.com/…/understanding-piezo-buzzers-how-th…

They use piezo buzzers which work differently to most speakers. I would guess that the units used in smoke alarms and microwaves generally have integrated drivers that only operate at a single frequency. However, it is possible to drive piezo discs at different frequencies. Their ouput will always approximate a sound wave though, so don’t expect to be able to use them like a normal electrodynamic/ voice coil speaker to play arbitrary sounds.

Understanding Piezo Buzzers: How They Work and How to Use Them in Electronics Projects

Discover how piezo buzzers work and how to use them in your electronics projects. This guide explains their function, wiring, and applications as sound emitters and sensors.

Labdarna

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Ephera

I would guess that the units used in smoke alarms and microwaves generally have integrated drivers that only operate at a single frequency.

Yeah, you could more easily create a rhythm than a full melody. If you get a few devices, which beep at different frequencies each, you could do a lot more by having them beep in succession and in intervals.

Of course, this requires that they’re roughly in tune, which may not be the case at all. 🥴