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GPIO Python Module
The GPIO pins can be used as both digital outputs and digital inputs. The High and Low levels are 3.3 volts and 0 volts. higher voltages may damage your PI.
The figure belwo shows the pinout for Raspberry Pi Rev 2.
To start using thr GPIOs you need to install a library called Rpi.GPIO. This module gives you a simple to use Python library that will let us control the GPIO pins. This library may be included in your image but doing the following steps will get you the lates version of this library.
You will probably be prompted to confirm by entering 'Y'.Thats all there is to it. You are ready to proceed.