RPi Tutorial EGHS:Switch Input

This page is part of a work in progress.

Warnings
While most of these circuits may interface directly to the RPi, the use of a buffered interface (such as the one supplied by the Gertboard) is recommended which will help protect against damage. Alternatively, experiment with one of the Alternative Test Platforms.

'''Extreme caution should be exercised when interfacing hardware at a low level, you may damage your RPi, your equipment and potentially yourself and others. Doing so is at your own risk!'''

Aims
Note: Until RPi devices are available, I can not confirm this will work on a real RPi. For now, I shall be using the TI LaunchPad (see Alternative Test Platforms for details) to test the hardware on (as it is cheap and the logic levels similar).

The Software
While the RPi is not available, I can only confirm the TI LaunchPad code works for me.

TI LaunchPad
The specifics and background behind the code is detailed very well on the following sites:

MSP430 LaunchPad PushButton

MSP430 LaunchPad Interrupt vs Polling

Sample test code for switch input (tested on TI MSP430G2553 device).

Circuit
Code: