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A very cool traffic light circuit with PCB layout ready!
You need 4 Red LEDs, 4 Green LEDs, and 2 Yellow LEDs. You will also need ten 150- or 220-Ohm resistors. I prepared you a PCB etch pattern so you do not have to do it if you like it permanent. Download the fritzing file because you might not know where the parts go! Have fun doing it!
Created on March 12, 2011, 12:49