gistfile1.txt

/* I started with:
 Controlling a servo position using a potentiometer (variable resistor) 
 by Michal Rinott <http://people.interaction-ivrea.it/m.rinott> 

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

#include <Servo.h>

Servo myservo1;  // create servo object to control a servo

int lspin = A0;  // analog pin used to connect the potentiometer
int val = 0;    // variable to read the value from the analog pin

int ledPinRed = 4;
int ledPinYell = 5;
int ledPinGreen = 6;

void setup()
{
  Serial.begin(9600);
  myservo1.attach(3);  // attaches the servo on pin 9 to the servo object

  pinMode(ledPinRed, OUTPUT);
  pinMode(ledPinYell, OUTPUT);
  pinMode(ledPinGreen, OUTPUT);
}

void loop() 
{ 
  val = analogRead(lspin);            // reads the value of the potentiometer (value between 0 and 1023) 
  int angle = map(val, 300, 800, 0, 179);     // scale it to use it with the servo (value between 0 and 180) 
  myservo1.write(angle);                  // sets the servo position according to the scaled value 
  delay(15);                           // waits for the servo to get there 

  if (angle > 60) {
    digitalWrite(ledPinGreen, HIGH);
  }

  else {
    digitalWrite(ledPinGreen, LOW);
  }

  if (angle > 110) {
    digitalWrite(ledPinYell, HIGH);
  }
  else {
    digitalWrite(ledPinYell, LOW);
  }

  if (angle > 175) {
    digitalWrite(ledPinRed, HIGH);
  }
  else {
    digitalWrite(ledPinRed, LOW);
  }  

}