int analogPin = 3;   // potentiometer connected to analog pin 3

int val = 0; 

int rLight = 0;
int wLight = 0;

void setup() {
  pinMode(5, OUTPUT);
  pinMode(6, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(3, INPUT);
  analogWrite(5, 0);
  analogWrite(6, 0);
  analogWrite(9, 0);
  analogWrite(10, 0);
 

}

void loop() {
  
  //analogWrite(5, 0);
  //analogWrite(6, 10);
   
  //analogWrite(9, 0);
  //analogWrite(10, 10);

  delay(10);

  int val = analogRead(analogPin);
 
  rLight = map(val, 0, 511, 255, 0);
  
  wLight = map(val, 512, 1023, 0, 255);

  if(rLight>0){
    
    analogWrite(5, rLight);
    analogWrite(6,0);
  }
  
  if(rLight==0 || wLight==0){
    analogWrite(5, 1);
    analogWrite(6,0);
  }
  
  if(wLight>0){
    analogWrite(5, 0);
    analogWrite(6,wLight);
    
  }
  

 

}