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4:07
YouTube
Re:Engineered
Build an Automatic Night-Light | LDR + PN2222 Transistor Explained
Build a fully automatic night light that turns on in the dark using nothing more than a photoresistor (LDR), a PN2222 transistor, and a 9-volt battery. No Arduino. No code. Just analog electronics doing exactly what they were designed to do. In this video, I’ll break down how a light-dependent resistor changes resistance with brightness, how ...
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