int relay = 13;
int relay1 = 10;
int relay2 = 2;
int potmeterPin= A0;

void setup() {
  // put your setup code here, to run once:
  pinMode(relay, OUTPUT);
  pinMode(relay1, OUTPUT);
  pinMode(relay2, OUTPUT);
  pinMode(potmeterPin, INPUT);
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
int potMeter = analogRead(potmeterPin);
int potValue = map(potMeter,0,1023,0,7000);
int countPot = map(potValue,0,7000,1,7);
Serial.println(countPot);
switch(countPot){
  case 1:
  digitalWrite(relay, HIGH);
  digitalWrite(relay1, LOW);
  digitalWrite(relay2, LOW);
  break;
  case 2:
  digitalWrite(relay, LOW);
  digitalWrite(relay1, HIGH);
  digitalWrite(relay2, LOW);
  break;
  case 3:
  digitalWrite(relay, HIGH);
  digitalWrite(relay1, HIGH);
  digitalWrite(relay2, LOW);
  break;
  case 4:
  digitalWrite(relay, LOW);
  digitalWrite(relay1, LOW);
  digitalWrite(relay2, HIGH);
  break;
  case 5:
  digitalWrite(relay, HIGH);
  digitalWrite(relay1, LOW);
  digitalWrite(relay2, HIGH);
  break;  
  case 6:
  digitalWrite(relay, LOW);
  digitalWrite(relay1, HIGH);
  digitalWrite(relay2, HIGH);
  break; 
  case 7:
  digitalWrite(relay, HIGH);
  digitalWrite(relay1, HIGH);
  digitalWrite(relay2, HIGH);
  break;

}
}