Controls a servo from an iOS device.

README.txt

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+Arduino / TouchOSC controller of a servo
+===================
+
+A simple project that controls the position of a servo via an on-screen rotary dial for an iOS device.
+
+Requirements
+-------
+To use this project you'll need the following:
+* [TouchOSC](http://hexler.net/software/touchosc) on your iOS device and also the layout editor on your computer.
+* [Processing](http://processing.org/), A programming environment for compiling and running the intermediary OSC --> Serial controller app.
+* [Arduino](http://arduino.cc), A development environment for the Arduino microprocessor, you'll use this to install the serial --> servo sketch on your Arduino.
+* A standard servo connected to pin 9 of your Arduino.
+
+Installation
+--------
+See [this video for an overview of the moving parts](http://www.youtube.com/watch?v=cA6ol-jXW4U) and [this SparkFun tutorial](http://www.sparkfun.com/tutorials/152), more details might be forthcoming.
+
+References
+---------
+* Heavily based on this Sparkfun tutorial: http://www.sparkfun.com/tutorials/152

Servo_select_over_serial.pde

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+// Sweep
+// by BARRAGAN <http://barraganstudio.com> 
+// This example code is in the public domain.
+
+// Range appears to be 0-171, and 600-2300 micros, 1350 midpoint
+
+
+#include <Servo.h> 
+
+#define LED_PIN 13
+
+Servo myservo;  // create servo object to control a servo 
+                // a maximum of eight servo objects can be created 
+
+int pos = 0;    // variable to store the servo position 
+
+void setup() 
+{ 
+  myservo.attach(9);  // attaches the servo on pin 9 to the servo object 
+  Serial.begin(9600);
+  digitalWrite(LED_PIN, LOW);
+  //Serial.println("Enter the servo position in degrees (0 - 180), followed by a period.");
+} 
+
+
+void loop() 
+{ 
+  boolean update = false;
+  while(Serial.available() > 0) {
+    byte temp = Serial.read();
+    if(temp == '.') {
+      update = true;
+      break;
+    } else {
+      pos *= 10; // shift the currently stored position
+      pos += (temp - '0'); // Add the new digit;
+    }
+  }
+
+  if(update && pos >= 0 && pos <= 180) {
+    int temp = map(pos, 0, 180, 550, 2300); // Map degrees (0-180) to Futaba servo microseconds...
+    myservo.writeMicroseconds(temp);
+    //Serial.print("Moving to position ");
+    //Serial.println(pos, DEC);
+    pos = 0;
+
+    // Blink LED as a sign of movement, twice over a quarter-second
+    //blinkLed(LED_PIN, 2, 250);
+  }
+  // Warn on invalid data
+  else if(update) {
+    //Serial.print("Invalid position [");
+    //Serial.print(pos, DEC);
+    //Serial.println("]. Please enter a position between 0 and 180 degrees");
+    pos = 0;
+  }
+}
+
+void blinkLed(int pin, int times, int duration) {
+  // The length of being on or off (total duration devided by the number of blinks + spaces in between)
+  int pulseDuration = duration / ((times * 2) - 1);
+
+  for(int i = 0; i < times; i++) {
+    digitalWrite(pin, HIGH);
+    delay(pulseDuration);
+    digitalWrite(pin, LOW);
+    // if its not the last blink...
+    if(i != times - 1) {
+      delay(pulseDuration);
+    }
+  }
+
+}
+

arduino_touchosc_controller.pde

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+import oscP5.*;        //  Load OSC P5 library
+import netP5.*;        //  Load net P5 library
+import processing.serial.*;    //  Load serial library
+
+Serial arduinoPort;        //  Set arduinoPort as serial connection
+OscP5 oscP5;            //  Set oscP5 as OSC connection
+
+int redLED = 0;        //  redLED lets us know if the LED is on or off
+int [] led = new int [2];    //  Array allows us to add more toggle buttons in TouchOSC
+int currentPos = 0;
+int desiredPos = 0;
+
+void setup() {
+  size(100,100);        // Processing screen size
+  noStroke();            //  We don’t want an outline or Stroke on our graphics
+    oscP5 = new OscP5(this,8000);  // Start oscP5, listening for incoming messages at port 8000
+   arduinoPort = new Serial(this, Serial.list()[0], 9600);    // Set arduino to 9600 baud
+}
+
+void oscEvent(OscMessage theOscMessage) {   //  This runs whenever there is a new OSC message
+
+    String addr = theOscMessage.addrPattern();  //  Creates a string out of the OSC message
+    if(addr.indexOf("/1/servo") !=-1){   // Filters out any toggle buttons
+      //int i = int((addr.charAt(9) )) - 0x30;   // returns the ASCII number so convert into a real number by subtracting 0x30
+      desiredPos  = int(theOscMessage.get(0).floatValue());     //  Puts button value into led[i]
+    // Button values can be read by using led[0], led[1], led[2], etc.
+
+    }
+}
+
+void draw() {
+ background(50);        // Sets the background to a dark grey, can be 0-255
+
+  if(currentPos != desiredPos) {
+    String pos = str(desiredPos);
+    println("Moving to position " + pos);
+    arduinoPort.write(pos);
+    arduinoPort.write('.');
+    currentPos = desiredPos;
+  }
+
+  redLED = int(map(desiredPos, 0, 180, 0, 255));
+  fill(redLED,0,0);            // Fill rectangle with redLED amount
+  ellipse(50, 50, 50, 50);    // Created an ellipse at 50 pixels from the left...
+                // 50 pixels from the top and a width of 50 and height of 50 pixels
+}
+