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** to make a 3d scanner http://hackedgadgets.com/2009/04/02/3d-arduino-scanner/
** with 2 servos (to be demonstrated), and an IR range-finder: http://www.acroname.com/robotics/parts/R144-GP2Y0A02YK.html
[[basic_digital]]
=== Week 3 - PWM, Analog Output ===