A 40 pin gpio header is found on all current raspberry pi boards unpopulated on pi zero and pi zero w prior to the pi 1 model b 2014 boards comprised a shorter 26 pin header any of the gpio pins can be designated in software as an input or output pin and used for a wide range of purposes. Interfacing hardware with the raspberry pi an exploration of gpio pins led and switch control last week i embarked on my journey with raspberry pi i set it up and had it perform some simple commands knowing nothing about linux and python initially i was daunted by even the simple task i was given but i neednt have been. This tutorial will show you how to interface a pir motion sensor with the raspberry pi and how to use the gpio pins on it the gpio pins on the raspberry pi are critical when it comes to making a hardware project whether its a robot or home automation system. I have a raspberry pi this post is about beginning to explore its control capabilities using the general purpose input output gpio port and is aimed at total beginners assuming that you have already got your raspberry pi up and running as described in my earlier post fire up your raspberry pi
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