Eli5 How does a smartphone turn on and off the flash light if there is not “switch”?

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I am a mechanical engineer so I dont really know de details of how electronics turn switches on or off without mechanical help

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Anonymous 0 Comments

since you understand switches and relays, the best way I can explain is that the processor is filled with tiny switches and when the programming dictates that the LED needs to be lit, a small voltage signal is sent to a solid state relay that connects the LED driver circuit to the battery to power the LED led flash

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