char val;                          // Data received from the serial port

 int ledPin = 2;                  // Set the pin to digital I/O 2

 int ledPin2 = 4;                //set the pin to digital I/O 4

 

 void setup() 

 {

   pinMode(ledPin, OUTPUT);        // Set pin as OUTPUT

   Serial.begin(9600);             // Start serial communication at 9600 bps

 }

 

 void loop() 

 {

   if (Serial.available()) 

   {                              // If data is available to read,

     val = Serial.read();         // read it and store it in val

   }

   if (val == 'H') 

   {                             // If H was received

     digitalWrite(ledPin, HIGH); // turn LED1 on

   } 

   Untitled Post

   else if (val == 'K') {        //If K was recieved

     digitalWrite(ledPin2, HIGH);//turn LED2 on

   }

   

     else if (val == 'P') {

       digitalWrite(ledPin, HIGH); //If P was received 

       digitalWrite(ledPin2, HIGH);//turn both LEDs on

     }

   

   else if (val == 'L') {

     digitalWrite(ledPin, LOW);  // If is received

     digitalWrite(ledPin2, LOW); //turn both LEDs off

   }

   delay(10);                   // Wait 10 milliseconds for next reading

 }

import processing.serial.*;

Serial myPort;  // Create object from Serial class

int val;        // Data received from the serial port

void setup() 

{

  size(400, 400);

  String portName = Serial.list()[0];

  myPort = new Serial(this, portName, 9600);

}

void draw() {

  background(255);

  if ((mouseX >= 50) && (mouseX <= 150) && (mouseY >= 50) && (mouseY <= 150)) {  

                                  // If mouse is over the first square,

    fill(225, 0, 0);              // change color and

    myPort.write('H');            // send an H to indicate mouse location

} 

else if ((mouseX >= 200) && (mouseX <= 300) && (mouseY >= 50) && (mouseY <= 150)) {

                                   // If mouse is over the second square,

  fill(0, 255, 0);                 //change color and 

  myPort.write('K');               // send a K to indicate mouse location

}

else if ((mouseX >= 50) && (mouseX <=150) && (mouseY >= 250) && (mouseY <= 350)) {

                                  //If mouse is over the third square,

  fill (0, 0, 255);               // change the color and

  myPort.write('P');              // send a P to indicate mouse location

}

  else {                          // If mouse is not over any square,

    fill(255, 255, 0);            // change color and

    myPort.write('L');            // send an L otherwise

  }

  

  rect(50, 50, 100, 100);         // Draw the first square

  rect(200, 50, 100, 100);        // Draw the second square

  rect(50, 250, 100, 100);        // Draw the third square

  

}