In the first .POST on Rpi e-cookery we showed how to install Raspbian and how to set up our Raspberry Pi to get us started. As promised last time, in this part we’ll be looking at the Expansion Header of the Raspberry Pi and how to program the GPIO pins we’ll find there. If you’ve read Elektor’s March 2013 edition some of this may be familiar to you, as we discussed the Expansion Port in the Raspberry Pi Prototyping Board article [1].
 
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For hardware hackers everywhere, the Raspberry Pi Expansion Header has to be the most exciting thing on the Pi, after the Pi’s stupendously low cost of course. You’ll find expansion header in the corner near the composite video connector. It’s a hobbyist friendly double row, 13-way 0.1” (2.54mm) pinheader connector so it makes interfacing to it easy.