IFD:PhysicalComp2011/code: Difference between revisions

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 </source>
+<br /><br />
+== 28.11.2011 Arduino & Processing sketches ==
+=== III Potentiometer (Arduino) ===
+[[File:III_poti_schematic.png|200px|thumb]]
+[[File:III_potentiometer_arduino.png|200px|thumb]]
+<source lang="java">
+/* TURNING THE KNOB (ARDUINO)
+ *
+ * Here we connect a potentiometer (variable resistor) to
+ * the analog pin 3 of our Arduino to control the state
+ * of an LED connected to pin 13 and also to send the
+ * value via the serial connection to a processing sketch.
+ *
+ * The value we get from an analog pin is ranging from
+ * 0 to 1023 (10 Bit). In order to send it as one Byte
+ * (8 Bit) we have to scale the incomming value using
+ * the map() function.
+ *
+ * NOTE: You can use the same code for many different
+ * types of variable resistors (e.g. photo resistor,
+ * bend sensor, etc.)
+ *
+ * Frederic Gmeiner, 2011
+ */
+// specify the pin numbers we are going to use:
+int ledPin = 13;
+int potiPin = 3;
+// create a variable to hold the value from the poti:
+int potiValue;
+void setup(){
+  // set the pin mode of the led pin to  act as an output:
+  pinMode(ledPin,OUTPUT);
+  // establish a serial connection:
+  Serial.begin(9600);
+}
+void loop(){
+  // read the current value of the poti pin
+  // and store it in the variable potiValue:
+  potiValue = analogRead(potiPin);
+  // if the value is over a certain threshold
+  // (here it's 511 or the middle of the range),
+  // turn the LED on, otherwise turn it off:
+  if(potiValue > 511){
+    digitalWrite(ledPin,HIGH);
+  }else{
+    digitalWrite(ledPin,LOW);
+  }
+  // in oder to send the poti value as one byte (0-255)
+  // we have to scale it from the original range (0 - 1023):
+  int scaledVal = map(potiValue,0,1023,0,255);
+  // send the scaled value via the serial port as a byte:
+  Serial.print(scaledVal,BYTE);
+  // wait a little bit to not overload the serial buffer:
+  delay(50);
+}
+</source>
+<br /><br />
+=== III Potentiometer (Processing) ===
+<source lang="java">
+/* TURNING THE KNOB (PROCESSING)
+ *
+ * Example of how to read incomming data
+ * from the serial connection.
+ *
+ * Frederic Gmeiner, 2011
+ */
+// first we have to import the serial library:
+import processing.serial.*;
+// variable for our Serial object:
+Serial myPort;
+// variable to hold the incomming value
+int incomingVal;
+void setup(){
+  size(255,255);
+  // this line is very helpful to find out the name of the serial
+  // port of your Arduino. It lists all available ports of your
+  // computer. (Make sure that your arduino is connected to a USB
+  // port before running this sketch)
+  println(Serial.list());
+  // make a new Serial object with the name of our current Arduino
+  // port. NOTE: The name of the port is different for each Arduino
+  // so we have to change it accordingly. On a windows system it is
+  // called different like "COM3" or similar.
+  myPort = new Serial(this,"/dev/tty.usbserial-A70061cx",9600);
+}
+void draw(){
+  background(0);
+  // only read from the serial port if there is new data
+  // available and store this in the variable incommingVal:
+  while(myPort.available() > 0){
+    incomingVal = myPort.read();
+  }
+  // set the fill color to the incomming value:
+  fill(incomingVal);
+  // draw a rectangle depending with the height of the
+  // incomming value:
+  rect(0,height-incomingVal,width,height);
+}
+</source>
 <br /><br />