this is a simple device that will successively light a series of leds depending on how dark/light it is in the room
plenty of light, no leds are on:
some light is blocked, 2 leds are light up:
almost all light is blocked and 5 out of 6 leds light up:
possible applications: illumination of light switches – as darkness sets it, the light switches are illuminated more and more making them easier to find and switch on.
further development ideas: incorporating some sort of calibration mechanism to accommodate a greater variety of light settings.