sweet links :: linearize IR sensor, drum waveshapes, R/2R dweeno DAC

Here is information on linearizing Sharp IR Rangefinder code:

http://www.acroname.com/robotics/info/articles/irlinear/irlinear.html

and tom igoe's implementation:

http://www.tigoe.net/pcomp/code/category/arduinowiring/44

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Sebastian Tomczak wrote the drum waveshaping code, and his blog post (as well as awesome drum machine) is here:

http://little-scale.blogspot.com/2008/04/arduino-drum-machine.html

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this is a tutorial and schematic on how to build a DAC (digital to analog converter) for the arduino. with this, you can output your sounds to an 1/8" (headphone) or 1/4" audio jack, with a simple circuit and lots of resistors. SO SICK.

http://blog.makezine.com/archive/2008/05/makeit_protodac_shield_fo.html