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A dark activated night light. Please also see this one by H4ZZ498 It's the same thing, he made it first thogh.
Breadboard (You could make a PCB if you want) Any NPN transistor One LDR 10k resistor ( Or trimpot for variable sensivity) A LED ( You choose the ...
Build the circuit on the breadboard!
Done! Now turn off the lights and it should light up.
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