Normally to drive a servo from an Arduino you use a digital pin for each servo (plus 5V and GND). However using a method and Arduino library published at the RC Arduino blog, you can control up to ten servos using only two digital I/O pins and an external 4017 logic IC. It’s much easier than you think, and really saves on I/O pins. The only warning to heed is that you don’t exceed the current ability of your Arduino, and therefore power the servos separately.
To get started, head over to the explanation page here. And we’re on twitter and Google+, so follow us for news and product updates as well.
When creating more complex circuitry such as a multiple-servo controller as described above for your Arduino – consider our range of ProtoShields. From the tiny LeoStick to the Mega range, we offer a complete range for you to work with.