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This tutorial will explain how to modify a servo for continuous rotation. If you do not feel like modifying a servo yourself, you can purchase modified servos from HVW Tech
Servos normally have a limitted rotation of about 180 degrees. The number of electrical pulses within an ammount of time determines how many degrees the servo will move the shaft. As you can imagine, that is a great feature with many uses. However, servos would be great to drive wheels and tractor treads if they could spin continuously.
Many benefits to using a servo for driving wheels. The servo is in its own little packaging and self contained with gears and circuits.
1 x Acoms AS-12 servo Enjoy RC Hobby
2 x 220 Ohm Resistors