Our first GPIO example will start from the very basics and build up a UK Pelican Crossing simulator using 5 x LEDs (A Red, Yellow and Green and another Red and Green for the Red and Green “man” indicators), 5 x 270Ω resistors and a single push-button for the pedestrians to control the lights. Here is a picture of the finished board, but we’ll build it up in stages as we go, and finally present som