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. 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. Sometimes you may need to connect an arduino to a raspberry pi for example if you have sensors motors and actuators you can connect these to the arduino and make the arduino send values to and from the raspberry pi this way we can separate the computing intensive tasks done by the raspberry pi and controlling tasks done by the arduino. Raspberry pis gpios can be used to control stepper motor rotation we can generate sequence of control signals on the gpio pins of raspberry pi to know more about raspberry pi gpio refer raspberry pi gpio access interfacing diagram stepper motor interfacing with raspberry pi example
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