Many servos are widely available and quite cheap. Servos can drive a great amount of current. This means that you wouldn’t be able to use more than one or two on your Arduino board without using an external source of power.
When do we need Servos?
How to control servos with Arduino
- 5 V
- Pulse; that is, control pin
Wiring Servo to Arduino
Firmware controlling one servo using the Servo library
We first include the Servo library header.