Servo Clicking/Servo Not working

[ighl]

Hello,

I had a question about connecting a servo to an Arduino. I have looked at many posts, and I think I do have the circuit correct. I am using the sample servo code given in the Arduino IDE, and the particular file is called. Here it is below for convenience:

/* Sweep
 by BARRAGAN <http://barraganstudio.com>
 This example code is in the public domain.

 modified 8 Nov 2013
 by Scott Fitzgerald
 http://www.arduino.cc/en/Tutorial/Sweep
*/

#include <Servo.h>

Servo myservo;  // create servo object to control a servo
// twelve servo objects can be created on most boards

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 >= 0; 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
  }
}

The circuit drawing is attached.

I ran into a problem where the servo worked the first time I uploaded code to the Arduino. But after that, it never worked again, and it just makes a clicking noise. I have looked at other posts, and one possible issue seems that the grounds aren't tied together properly, but I have already made sure that they are grounded properly. I have also disconnected/reattached the Arduino, and the external power supply for the servo. I'm using 5V, 2 Amps to externally power the servo, which seems reasonable.

Any advice on how to fix this issue would be much appreciated!

[Robin2]

Image from Original Post so we don't have to download it. See Image Guide

...R

[Robin2]

I never trust Fritzing diagrams to show things unambiguously but, with that caveat, your diagram looks correct EXCEPT that the servo seems to be connected to pin 5 and your code says pin 9.

Check carefully for loose connections or poorly soldered joints.

Can you check with your multimeter that there is a continuous circuit from your battery to your servo?

Have you some other way (such as an R/C receiver) to prove that the servo is working correctly?
Have you another servo that you can try?

When the servo is disconnected from power can you turn the servo arm with your fingers and set it at its center position. Be careful to move it very slowly in case you damage the gears inside.

...R