//SerialMonitor

const int greenPin= 3; //the green led pin attact to
const int redPin= 4; //the red led pin attach to
int comdata1;
int comdata2;


void setup()
{
pinMode(greenPin,OUTPUT); //initialize the greenPin as output
pinMode(redPin, OUTPUT); //initialize the redPin as output
Serial.begin(9600); // start serial port at 9600 bps:
//print message on serial monitor
Serial.println("Enter the numbers:");
}


void loop()
{
//read string from serial monitor
if (Serial.available()>0) // check if data has been sent from the computer
{
  
   while (Serial.available() == 0){}    
   comdata1 = (Serial.parseInt());
   delay(5);
   Serial.println("Enter the numbers:");
   comdata3(comdata1);
   /*
    if(comdata1 == 123)
    {
    digitalWrite(redPin, LOW);//turn the red led on
    digitalWrite(greenPin, HIGH);//turn the green led off
    Serial.println("OPENED");
    comdata2 = comdata1;
    delay (500);
    }

    else if(comdata1 == 125)
    {
    digitalWrite(redPin, HIGH);//turn the red led off
    digitalWrite(greenPin, LOW);//turn the green led on
    Serial.println("CLOSED");
    comdata2 = comdata1; 
    delay (500);
    }

    else if(comdata1 == 0)
    {
    comdata1 = comdata2;  
    delay (500);
    }

    else
    {
    digitalWrite(redPin, LOW);//turn the red led off
    digitalWrite(greenPin, LOW);//turn the green led off
    Serial.println("INVALID");
    delay (500);
    } */
}

}

void comdata3(int comdata1)
{
Serial.println(comdata1);
  switch(comdata1)
    {
      case 0:
      comdata1 = comdata2;
      break;

      case 123:
      digitalWrite(redPin, LOW);//turn the red led on
      digitalWrite(greenPin, HIGH);//turn the green led off
      Serial.println("OPENED");
      delay (200);
      comdata2 = comdata1;
      break;

      case 125:
      digitalWrite(redPin, HIGH);//turn the red led on
      digitalWrite(greenPin, LOW);//turn the green led off
      Serial.println("CLOSED");
      delay (200);
      comdata2 = comdata1;
      break;

      default:
      digitalWrite(redPin, LOW);//turn the red led off
      digitalWrite(greenPin, LOW);//turn the green led off
      Serial.println("INVALID");
      delay (200);
      comdata2 = 0;
      comdata1 = 0;
      break;
    }
  
}

/*
const int greenPin= 2; //the green led pin attact to
const int yellowPin= 3; //the yellow led pin attact to
int redPin= 4; //the red led pin attach to
String comdata = "";
int lastLength = 0;

void setup()
{
pinMode(greenPin,OUTPUT); //initialize the greenPin as output
pinMode(yellowPin, OUTPUT); //initialize the yellowPin as output
pinMode(redPin, OUTPUT); //initialize the redPin as output
Serial.begin(9600); // start serial port at 9600 bps:
Serial.println("Please input any color of LED:"); //print message on serial monitor
}

void loop()
{
//read string from serial monitor
if(Serial.available()>0) // check if data has been sent from the computer
{
comdata = "";
while (Serial.available() > 0)
{
comdata += char(Serial.read());
delay(2);
}
Serial.println(comdata);
}

if(comdata == "red")
{
digitalWrite(redPin, HIGH);//turn the red led on
digitalWrite(greenPin, LOW);//turn the green led off
digitalWrite(yellowPin, LOW);//turn the yellow led off
}

else if(comdata == "yellow")
{
digitalWrite(redPin, LOW);//turn the red led off
digitalWrite(greenPin, LOW);//turn the green led off
digitalWrite(yellowPin, HIGH);//turn the yellow led on
}

else if(comdata == "green")
{
digitalWrite(redPin, LOW);//turn the red led off
digitalWrite(greenPin, HIGH);//turn the green led on
digitalWrite(yellowPin, LOW);//turn the yellow led off
}

else
{
digitalWrite(redPin, LOW);//turn the red led off
digitalWrite(greenPin, LOW);//turn the green led off
digitalWrite(yellowPin, LOW);//turn the yellow led off
}

}
*/