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→Reference
=== Reference ===
=== Reference ===
* [http://elinux.org/RPi_Tutorial_EGHS:GPIO_Protection_Circuits GPIO protection circuits]: different approaches to safely interfacing with RPi pins
* [http://elinux.org/RPi_Tutorial_EGHS:GPIO_Protection_Circuits GPIO protection circuits]: different approaches to safely interfacing with RPi pins
* [http://www.sparkfun.com/tutorials/65 SparkFun sensor interfacing]: general tutorial for logic level conversion
** [http://www.sparkfun.com/tutorials/65 SparkFun sensor interfacing]: general tutorial for logic level conversion
* [http://www.raspberrypi.org/phpBB3//viewtopic.php?f=44&t=12498 Max current for GPIO pins]
* [http://www.raspberrypi.org/phpBB3//viewtopic.php?f=44&t=12498 Max current for GPIO pins]
** [http://www.scribd.com/doc/101830961/GPIO-Pads-Control2 GPIO pads control]: documentation by SoC engineer Gert van Loo
** [http://www.scribd.com/doc/101830961/GPIO-Pads-Control2 GPIO pads control]: documentation by SoC engineer Gert van Loo