led_sign.pde

import processing.serial.*;   //we need the use of this library to communicate with the serial port

Serial myPort;  // Create object from Serial class

//these are the diffent messages that we will send to the sign, remeber the sign has a protocol
String message0 = "<ID01>"; //wake up call
String message1 = "<ID01><PA><FQ><CC>Red Box "; //command for sign number 1, page 1, make text appear and stop , red colour font with the message 'red box'
String message2 = "<ID01><PA><FQ><CL>Green Box ";//same as above but colour of text is green as is the message
 String message3 = "<ID01><PA><FL><CC>          ";//clear screen by dropping away like rain.
char character;  //we will send one charater at a time this is the place holder


void setup() 
{
  
  size(200, 200);
  // I know that the first port in the serial list on 
  //the machine running the Prolite is the serial port we need.
  
  String portName = Serial.list()[0];
  
  
  
  myPort = new Serial(this, portName, 9600);
}

void draw() {
  background(255);
  callSign();
  fill(255,0,0);
  rect(20, 20, 50, 50); 
  fill(0,255,0);
  rect(90, 20, 50, 50);
  
}

boolean mouseOverRect() { // Test if mouse is over square
  return ((mouseX >= 20) && (mouseX <= 70) && (mouseY >= 20) && (mouseY <= 70));
}
boolean mouseOverRect2() { // Test if mouse is over square
  return ((mouseX >= 90) && (mouseX <= 140) && (mouseY >= 20) && (mouseY <= 70));
}

void callSign(){
  for(int i = 0;i<=message0.length()-1;i++){
      character = message0.charAt(i);
    myPort.write(byte(character)); //wake up the sign
        
  }
  myPort.write(13); //end of line
  myPort.write(10); // carriage return
  delay(30);
  
}


void mousePressed(){
  
  for(int i = 0;i<=message3.length()-1;i++){
     character = message3.charAt(i);
    myPort.write(byte(character));  //clear the screen when mouse is clicked
    }
    myPort.write(13); //end of line
    myPort.write(10); //carriage return
    
    delay(500);
  
  if (mouseOverRect() == true) {  // If mouse is over the red square,
    fill(255,100,100);                    // change color and
    rect(20, 20, 50, 50);
    
    
    for(int i = 0;i<=message1.length()-1;i++){
     character = message1.charAt(i);
    myPort.write(byte(character));  //update sign with message 1
    }
    myPort.write(13); //end of line
    myPort.write(10); //carriage return
    } 
  if (mouseOverRect2() == true){                        // If mouse is over the green square,
    fill(100,255,100); // change color
    rect(90, 20, 50, 20);    //redraw to screen
    for(int i = 0;i<=message2.length()-1;i++){
      character = message2.charAt(i);
    myPort.write(byte(character));              // send message 2
  } 
  myPort.write(13); //end of line
  myPort.write(10); //carriage return
  
  }
delay(30);  
}