This Led Bouy is for fishing or geocaching.
falshes every 2 Sec for 250ms.
will only flash if the LDR detects darkness (runntime not tested should be over a month with 18650 3400mA Battery)
designed for LiPo battery 3-4.4V
cuttoff voltage at 3.0V for unprotected LiPo´s
best use with 18650 3400mA Battery, so the runntime is > 1 week when the LDR is disabled (flashes 24/7)
Code only compiles with Arduino 1.0.6 the new >1.6 throws errors!