void setup() {
  Serial.begin(9600);
  pinMode(9, OUTPUT);
  pinMode(6, OUTPUT);
  pinMode(5, OUTPUT);
}

void loop() {
  int pot = analogRead(A2);
  Serial.println(pot);

  if(pot <= 300){
    analogWrite(9, 255);
    analogWrite(6, 0);
    analogWrite(5, 0);
  }
  if(pot > 300 && pot <= 700){
    analogWrite(9, 0);
    analogWrite(6, 255);
    analogWrite(5, 0);
  }
  if(pot > 700){
    analogWrite(9, 0);
    analogWrite(6, 0);
    analogWrite(5, 255);
  }
}