int pot = A0;
int red = 4;
int yellow= 5;
int blue = 6;
void setup()
{
  pinMode(pot,INPUT);
  pinMode(red,OUTPUT);
  pinMode(yellow,OUTPUT);
  pinMode(blue,OUTPUT);
  Serial.begin(9600);
}
void loop()
{
  int value = analogRead(pot);
  Serial.println(value);
  int value1 = map(value , 0,1023,0,255);
  Serial.println(value1);
if (value1<=100)
{
digitalWrite(red , HIGH);
digitalWrite(yellow , LOW);
digitalWrite(blue , LOW);
Serial.println("my red is on ");
}
else if (value1>=100 && value1<=180)
{
digitalWrite(red , LOW);
digitalWrite(yellow , HIGH);
digitalWrite(blue, LOW);
Serial.println("my yellow is on ");
}
else 
{
digitalWrite(red , LOW);
digitalWrite(yellow , LOW);
digitalWrite(blue , HIGH);
Serial.println("my blue is on ");
}
}