Control servo using potentiometer

1#include <Servo.h>
2
3
4 
5 Servo servo_test;      //initialize  a servo object for the connected servo  
6                
7 int angle = 0;    
8 int potentio = A0;      // initialize the A0analog pin for potentiometer
9
10  
11 void setup() 
12 { 
13  servo_test.attach(9);   // attach the signal pin  of servo to pin9 of arduino
14 } 
15 
16 void loop() 
17 { 
18  angle = analogRead(potentio);            // reading the potentiometer value between 0 and 1023 
19  angle =  map(angle, 0, 1023, 0, 179);     // scaling the potentiometer value to angle value  for servo between 0 and 180) 
20  servo_test.write(angle);                   //command  to rotate the servo to the specified angle 
21  delay(5);             
22 }  
23