this post was submitted on 06 May 2026
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The incredibly silly true answer is that the software industry's love for "deploy early, deploy often" has led to all embedded devices shipping with over-the-air (OTA) update support even when it barely makes sense. The earliest units of a given product run will ship with a minimally viable product build that has lots of bugs, but solid OTA.
Fun anecdote: I had a TV backlight die after about 3 years, and the root cause was a shitty embedded app that incorrectly regulated the voltage for the LED strips.
I don't think that actually answers OP's question. If all it does is vibrate then it doesn't need any software. It presumably just has a single button that turns vibration on/off and maybe cycles through vibration levels. A dumb circuit without even a single chip in it could do that.
Because it's cheaper to buy a commodity chip and program it rather than get an application specific chip made.
You don't need a chip in a vibration circuit. Hell a potentiometer is more than sufficient to give you different levels of vibration
Ah, but what if you want it to vibrate to the beat of your favorite song? Did you think about that?
I'm just guessing here, but it's probably for battery management and wireless charging, which are tricky problems you're not gonna solve with a 555. I generally trust EEs to not put MCUs where they aren't needed, so this must have been the cheapest/easiest option.