The video below showing an all-new iPod nano transformed into a little walking robot, “For this project, I’ve developed very simple way to control two servo motors by iPod nano: using the sound from headphone jack as PWM signal that controls the servo motors! Yes, two servos are powered by miniature 3.7V 110mAh Li-Po battery and control lines are directly connected to headphone jack! Very simple!,” says the creator.
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