Tutorial: Raspberry Pi - How-to Drive a Servo Motor via Arduino!
Here's a simple way to control a hobby servo from a Raspberry Pi using an Arduino!
The Raspberry Pi's output pin is turned "high" (puts out 3.3v) - the Arduino reads this via a digitalRead and then controls the servo motor!
Arduino: http://amzn.to/1E0gxVU
Raspberry Pi: http://amzn.to/1tw5dhj
Servo: http://amzn.to/1x6ObqQ
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