Servo

Servo:

Servo

Model = SG90

Servo has only three wires: Positive (Red), Ground (Black) and Signal (White or some other colour)

http://store.iteadstudio.com/images/produce/Robot/Motor_And_Servo/SG-90_Servo/sg90.JPG

Wiring

https://www.arduino.cc/en/uploads/Tutorial/sweep_bb.png

Note that the pin 9 of Arduino Uno Board is connected to the signal input of servo

#include 

Servo myservo; // create servo object to control a servo
 // a maximum of eight servo objects can be created

int pos = 0; // variable to store the servo position

void setup()
{
 myservo.attach(9);// attaches the servo on pin 9 to the servo object
}


void loop()
{
 for(pos = 0; pos < 180; pos += 1) // goes from 0 degrees to 180 degrees
 { // in steps of 1 degree
 myservo.write(pos); // tell servo to go to position in variable 'pos'
 delay(15); // waits 15ms for the servo to reach the position
 }
 for(pos = 180; pos>=1; pos-=1) // goes from 180 degrees to 0 degrees
 { myservo.write(pos); // tell servo to go to position in variable 'pos'
 delay(15); // waits 15ms for the servo to reach the position
 }
}