Hi, I have a kids toy that uses a photocell. When the photocell is covered up, it plays a sound. When the photocell is exposed to light again, the sound plays again. How is this being done? I often would like to monitor a low-to-high or high-to-low transition on an analog pin for a microcontroller…

mystery toy - uses photocells to play music when light changes

knut_ny March 9, 2018, 5:23pm 3

to save power.

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