/*
  Serial Call and Response in ASCII
 Language: Wiring/Arduino
 
 This program sends an ASCII A (byte of value 65) on startup
 and repeats that until it gets some data in.
 Then it waits for a byte in the serial port, and 
 sends three ASCII-encoded, comma-separated sensor values, 
 truncated by a linefeed and carriage return, 
 whenever it gets a byte in.
 
 Thanks to Greg Shakar and Scott Fitzgerald for the improvements
 
  The circuit:
 * potentiometers attached to analog inputs 0 and 1 
 * pushbutton attached to digital I/O 2
 
 
 http://www.arduino.cc/en/Tutorial/SerialCallResponseASCII
 
 Created 26 Sept. 2005
 by Tom Igoe
 Modified 14 April 2009
 by Tom Igoe and Scott Fitzgerald

 Ported to the Maple 27 May 2010 by Bryan Newbold
 */

int firstSensor = 0;    // first analog sensor
int secondSensor = 0;   // second analog sensor
int thirdSensor = 0;    // digital sensor
int inByte = 0;         // incoming serial byte

void setup()
{
  pinMode(2, INPUT);   // digital sensor is on digital pin 2
  establishContact();  // send a byte to establish contact until receiver responds 
}

void loop()
{
  // if we get a valid byte, read analog ins:
  if (SerialUSB.available() > 0) {
    // get incoming byte:
    inByte = SerialUSB.read();
    // read first analog input, divide by 4 to make the range 0-255:
    firstSensor = analogRead(0)/4;
    // delay 10ms to let the ADC recover:
    delay(10);
    // read second analog input, divide by 4 to make the range 0-255:
    secondSensor = analogRead(1)/4;
    // read  switch, map it to 0 or 255L
    thirdSensor = map(digitalRead(2), 0, 1, 0, 255);  
    // send sensor values:
    SerialUSB.print(firstSensor, DEC);
    SerialUSB.print(",");
    SerialUSB.print(secondSensor, DEC);
    SerialUSB.print(",");
    SerialUSB.println(thirdSensor, DEC);               
  }
}

void establishContact() {
  while (SerialUSB.available() <= 0) {
    SerialUSB.println("0,0,0");   // send an initial string
    delay(300);
  }
}


/*
Processing code to run with this example:


import processing.serial.*;     // import the Processing serial library
Serial myPort;                  // The serial port

float bgcolor;			// Background color
float fgcolor;			// Fill color
float xpos, ypos;	        // Starting position of the ball

void setup() {
  size(640,480);

  // List all the available serial ports
  println(Serial.list());

  // I know that the first port in the serial list on my mac
  // is always my  Arduino module, so I open Serial.list()[0].
  // Change the 0 to the appropriate number of the serial port
  // that your microcontroller is attached to.
  myPort = new Serial(this, Serial.list()[0], 9600);

  // read bytes into a buffer until you get a linefeed (ASCII 10):
  myPort.bufferUntil('\n');
  
  // draw with smooth edges:
  smooth();
}

void draw() {
  background(bgcolor);
  fill(fgcolor);
  // Draw the shape
  ellipse(xpos, ypos, 20, 20);
}

// serialEvent  method is run automatically by the Processing applet
// whenever the buffer reaches the  byte value set in the bufferUntil() 
// method in the setup():

void serialEvent(Serial myPort) { 
  // read the serial buffer:
  String myString = myPort.readStringUntil('\n');
  // if you got any bytes other than the linefeed:
    myString = trim(myString);
 
    // split the string at the commas
    // and convert the sections into integers:
    int sensors[] = int(split(myString, ','));

    // print out the values you got:
    for (int sensorNum = 0; sensorNum < sensors.length; sensorNum++) {
      print("Sensor " + sensorNum + ": " + sensors[sensorNum] + "\t"); 
    }
    // add a linefeed after all the sensor values are printed:
    println();
    if (sensors.length > 1) {
      xpos = map(sensors[0], 0,1023,0,width);
      ypos = map(sensors[1], 0,1023,0,height);
      fgcolor = sensors[2];
    }
    // send a byte to ask for more data:
    myPort.write("A");
  }

*/

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