The Python library used in connecting the platform to the physical world for electronic controls is the RPi.GPIO code. In this session we'll investigate the RPi's GPIO (General Input Output) pins and how to enable them with the RPi.GPIO library. We'll investigate how to install the library using LXTerminal/Linux commands. The final test of the RPi.GPIO library installation will consist of controlling an LED and reading an electric switch wired to the Raspberry Pi.