int red1 = 4;
int yellow1 = 3;
int green1 = 2;

void setup() {
  // put your setup code here, to run once:
  

  pinMode(red1, OUTPUT);
  pinMode(yellow1, OUTPUT);
  pinMode(green1,  OUTPUT);
  Serial.begin(115200);
  Serial.println("1");
}

void loop() {
  // digitalWrite(red1, HIGH);
  // put your main code here, to run repeatedly:
  while(Serial.available())  
  {  
    delay(5);  // It will read the incoming or arriving data byte  
    char command = Serial.read();
    switch (command){
      case '1':
        digitalWrite(red1, HIGH);
        digitalWrite(yellow1, HIGH);
        digitalWrite(green1, HIGH);
    }
  }  
}