void setup() {
  
 pinMode(23, INPUT); //S1
 pinMode(22, INPUT); //S2
 pinMode(21, INPUT); //S3

 pinMode(5, OUTPUT); //CAPACITOR 1
 pinMode(4, OUTPUT); //CAPACITOR 2



} 

void loop() {
  if(digitalRead(23)==HIGH && digitalRead(22)==HIGH && digitalRead(21)==HIGH)
  {
    digitalWrite(4,HIGH); // CAPACITOR 2
    digitalWrite(5, HIGH); // CAPACITOR 1 
  }
  else if ((digitalRead(23)==HIGH && digitalRead(22)==HIGH) || (digitalRead(23)==HIGH && digitalRead(21)==HIGH) || (digitalRead(21)==HIGH && digitalRead(22)==HIGH))
  {
  digitalWrite(5,LOW); // CAPACITOR 1
  digitalWrite(4, HIGH); // CAPACITOR 2   
  }
  else if(digitalRead(23)==HIGH || digitalRead(22)==HIGH || digitalRead(21)==HIGH)
   {
    digitalWrite(5, HIGH); // CAPACITOR 1
    digitalWrite(4, LOW); // CAPACITOR 2
   }
   else{
     digitalWrite(5, LOW); // CAPACITOR 1
    digitalWrite(4, LOW); // CAPACITOR 2
   }
}