HomePi – connecting the Pi and the LED board

After setting up the LED board (HomePi – Starting with the LED board) and proving that it is actually working, it is now time to connect the Pi with the LED board. In this blog Post, we will talk about:

  • The Raspberry Pi GPIOs in general
  • How to connect the two devices
  • Download & use a software that allows to control the GPIOs/LEDs

First things first: The GPIOs

GPIO stands for General purpose input/output. We find them on the Raspberry Pi. A very good source of information is https://www.raspberrypi.org/documentation/usage/gpio/ where we find an image explaining the PIN numbering and location on the board.

The GPIO pins are a physical interface between the Pi and the outside world. At the simplest level, you might think of them as switches that you can turn on or off (input case) or that the Pi can turn on or off (output case).

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Hacking Contest by Google, Code Jam 2012

Get seated, ready, steady.. GO. There is another annual hacking cup coming. I already pointed to the Facebook Hacker Cup a few days ago. Now it is time to announce that also Google is doing it’s annual contest in 2012.

Google Code Jam 2012

The first round starts in March 2012, so maybe you already want to lock the door for practicing.

Last year over 30,000 coders competed, be the 30,001 hacker that gets the almighty title of Code Jam Champion, and a hefty $10,000 reward.

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Quantum Leviation

As you seem to be geeky enough to read this blog, I assume that you all remember the awesome “hover board” from the movie back to the future. It was so much fun to watch Micheal J Fox ride this skate board with no wheels like crazy. I was so impressed.

Today I am impressed again, as I found a video on youtube the shows a quantum leviation demo. They are using a silicon wafer coated with some special copper alloy. Cooling the wafer down to very low temperatures makes it a superconductor. This way they are able to let the waver float over a magnetic rail.

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