Physical Computing with Raspberry Pi - Light up! (2/7)

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We are going to start with using LEDs. Light Emitting Diodes (LED) are a simple way to bring physical computing to life. We will work to turn the light one and make it blink. Once you understand how to do this, an entire world of physical computing will be open to you.

Key Concepts:
- GPIO
- Time
- Sleep

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is it ok to work on the circuit when the Pi is running? I read online that it's a good idea to shut down the Pi every time you add or remove a wire or anything like that. It's a pain to have to turn it off an every every five minutes when working on a project.

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