void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("ONE SWITCH 4 TRAFFIC LED LIGHT");
  pinMode(26, INPUT);
  pinMode(21,OUTPUT); //RED-1
  pinMode(12, OUTPUT); //YELLOW-1
  pinMode(18, OUTPUT); //GREEEN-1
  pinMode(16,OUTPUT); //RED-2
  pinMode(17, OUTPUT); //YELLOW-2
  pinMode(5, OUTPUT); //GREEEN-2
  pinMode(19,OUTPUT); //RED-3
  pinMode(14, OUTPUT); //YELLOW-3
  pinMode(13, OUTPUT); //GREEEN-3
  pinMode(4,OUTPUT); //RED-4
  pinMode(2, OUTPUT); //YELLOW-4
  pinMode(15, OUTPUT); //GREEEN-4
}

void loop() {
  // put your main code here, to run repeatedly:
  int a=digitalRead(26);
  if(a==1)
  {
    Serial.println(a);
    digitalWrite(21, HIGH);//1
    digitalWrite(12, HIGH);
    digitalWrite(18, HIGH);
    digitalWrite(16, HIGH);//2
    digitalWrite(17, HIGH);
    digitalWrite(5, HIGH);
    digitalWrite(19, HIGH);//3
    digitalWrite(14, HIGH);
    digitalWrite(13, HIGH);
    digitalWrite(4, HIGH);//4
    digitalWrite(2, HIGH);
    digitalWrite(15, HIGH);
  }
  else(a==0);
  {
      Serial.println(a);
    digitalWrite(21,LOW);//1
    digitalWrite(12,LOW);
    digitalWrite(18,LOW);
    digitalWrite(16,LOW);//2
    digitalWrite(17,LOW);
    digitalWrite(5,LOW);
    digitalWrite(19,LOW);//3
    digitalWrite(14,LOW);
    digitalWrite(13,LOW);
    digitalWrite(4,LOW);//4
    digitalWrite(2,LOW);
    digitalWrite(15,LOW);
  }

}