a quite simple ``light soaking at daylight, blinking at night time'' device.
very nice is that the blinking is more a flash followed by a dimmed lighting before switching off.
some devices standing together seem to communicate together when the daytime fades.
and it's easily put together:
about the sn74hc240 logic chip here in duty.
(guess, which one is bert ;)
and here a dual LED version. i really like the look with the rusty 3.5" adapter:
