char val;                       // Data received from the serial port 
int motorpin = 0;               // Wiring: Connect L293D Pin En1 connected to pin PWM 0 

void setup() { 
  Serial.begin(9600);           // Start serial communication at 9600 bps 
} 

void loop() { 
  if (Serial.available()) {     // If data is available, 
    val = Serial.read();        // read it and store it in val 
    if (val == 'H') {             // If 'H' was received, 
      analogWrite(motorpin, 125); // turn the motor on at medium speed 
    } 
    else if (val == 'L'){       // If 'L' was received 
      analogWrite(motorpin, 0);   // turn the motor off 
    } 
  } 
  delay(100);                   // Wait 100 milliseconds for next reading 
} 



/* Processing code for this example 

// Write data to the serial port according to the status of a button controlled 
// by the mouse 

import processing.serial.*; 

Serial port;                // Create serial port object 
boolean rectOver = false; 
int rectX, rectY;           // Position of square button 
int rectSize = 100;         // Diameter of rect 
color rectColor; 
boolean buttonOn = false;   // Status of the button 

void setup() { 
  size(200, 200); 
  noStroke(); 
  frameRate(10); 
  rectColor = color(100); 
  rectX = width/2 - rectSize/2; 
  rectY = height/2 - rectSize/2; 

  // List all the available serial ports in the output pane. 
  // You will need to choose the port that the Wiring board is 
  // connected to from this list. The first port in the list is 
  // port #0 and the third port in the list is port #2. 
  println(Serial.list()); 

  // Open the port that the Wiring board is connected to (in this case #2) 
  // Make sure to open the port at the same speed Wiring is using (9600bps) 
  port = new Serial(this, Serial.list()[2], 9600); 
} 

void draw() { 
  update(mouseX, mouseY); 
  background(0);            // Clear background to black 
  fill(rectColor); 
  rect(rectX, rectY, rectSize, rectSize); 
} 

void update(int x, int y) { 
  if (overRect(rectX, rectY, rectSize, rectSize) = true) { 
    rectOver = true; 
  } 
  else { 
    rectOver = false; 
  } 
} 

void mouseReleased() { 
  if(rectOver == true) { 
    if (buttonOn) { 
      rectColor = color(100); 
      buttonOn = false; 
      port.write('L');      // Send an L to indicate button is OFF 
    } 
    else { 
      rectColor = color(180); 
      buttonOn = true; 
      port.write('H');      // Send an H to indicate button is ON 
    } 
  } 
} 

boolean overRect(int x, int y, int width, int height) { 
  if ((mouseX >= x) && (mouseX <= x+width) && 
    (mouseY >= y) && (mouseY <= y+height)) { 
    return true; 
  } 
  else { 
    return false; 
  } 
} 

*/