Light-Activated Nightlight Using an LDR and Transistor — Widescreen project video

Simple photoresistor voltage divider feeding a transistor base that switches on a string of LEDs once ambient light drops below a threshold. No microcontroller involved — fully analog. Mounted the LDR facing a window so it automatically turns the LED strip on at dusk and off again at sunrise. Tuned the threshold by swapping the fixed resistor value a few times until the trigger point felt right for the room.