The Arduino Servo SG90 is a great starter item if you're interested in making things move with your Arduino. Arduino servos are easy to connect (only one wire is needed for control) and use because the motor driver (H-Bridge) is built into the servo. The motor driver (H-Bridge) receives position feedback from the potentiometer connected to the output shaft. The range of motion is from 0 to 180 degrees (Half-Circle). The Arduino Servo SG90 is made up of a small motor connected through gears to an output shaft. The output shaft can be connected to any one of the three servo arms included in the kit.
All prices are in USD