Photo-sensetive Running Top
If you run at night this is for you. This lights up as it gets darker outside on two independent photocells and no micro controller!Materials 10 x 3mm red LEDs12 x 3mm white LEDs2 x PNP 2N3960 -E13 Transistors2 x 5mm Photocells1 x 22k Ω resistor (not pictured) 2 x 47k Ω resistorBattery holder with ...By: emilydaub
Continue Reading »
from Instructables: exploring - featured http://ift.tt/1VN4usY
via IFTTT