int potPin1 = A1; 
int potPin2 = A2;   

int val1 = 0;  
int val1Old = 0; 
int val2 = 0;

void setup() {
  Serial.begin(9600);
  pinMode(A3, OUTPUT);
  pinMode(A4, OUTPUT);
  pinMode(A5, OUTPUT);
}
void loop() {
  val1 = analogRead(potPin1);
  if(val1 != val1Old){
  //CONTROL BRIGHTNESS   
    brightness(int(float(val1/1024.0) * 255));
  }

  val2 = analogRead(potPin2); 
  brightness(val1);
  delay(val2);
  brightness(0);
  delay(val2);
}
void brightness(int val ){
  //adjust brightness of an RGB LED
  analogWrite(A3, val);
  analogWrite(A4, val);
  analogWrite(A5, val);
}