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→Tutorial
*RPi is 3.3V.
*pin over-voltage protection circuits - http://elinux.org/RPi_Tutorial_EGHS:GPIO_Protection_Circuits
==TutorialTutorials==
*Single LED-https://projects.drogon.net/raspberry-pi/gpio-examples/tux-crossing/gpio-examples-1-a-single-led/
*GPIO examples-https://projects.drogon.net/raspberry-pi/gpio-examples/