void setup() {
  pinMode(2, OUTPUT); //s0
  pinMode(3, OUTPUT); //s1
  pinMode(4, OUTPUT); //s2
  pinMode(5, OUTPUT); //s3
  pinMode(7, OUTPUT); //led
  Serial.begin(9600);
  digitalWrite(7, HIGH);
  digitalWrite(2, HIGH);
  digitalWrite(3, HIGH);
}

void loop() {
 delay(10);
 filter(0,0,'R');
 filter(1,1,'G');
 filter(0,1,'B');
}

void filter(int stan1, int stan2,char kolor){
  byte val;
  digitalWrite(4, stan1);
  digitalWrite(5, stan2);
  Serial.print(kolor);
  Serial.print(':');
  val = analogRead(A0);
  Serial.println(val);
  delay(1000);
}