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https://www.labdarna.com/en/understanding-piezo-buzzers-how-they-work-and-how-to-use-them-in-electronics-projects
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.
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. ๐ฅด
Depending on how briefly they can be triggered i wonder if it could be fired in a controlled enough temporal pattern to create recognizable notes. Human hearing goes down to 40 cycles per second, so if it can fire in burst of less than a 40th of a second then that could work
The link I included in my comment goes over driving one in recognizeable notes to play the nokia tune. It's worth a read if this concept interests you.
Piezo buzzers have a resonant frequency they're strongest at. Two-pin piezo disks need driving at the desired frequency. Three-pin provide a phase-shifted feedback to the driving transistor to keep oscillating at the resonant frequency. Some include that whole circuit inside their housing so they have just 2 pins but those are for DC power, only the volume can be somewhat adjusted by changing the input voltage.
The only ones I've ever used myself area is the DC variety. Apply power: beeeeep; stop applying power:
I don't know why idea are more commonly used in consumer electronics.
You can if the buzzer signal is only used to trigger a secondary circuit that does what op is looking for.
That's what I would do. Hook jumpers from the buzzer to the play button of an mp3 player. That way if the music system fails, the buzzer still wakes you up.