added support for arduino yun

arduino/ratpack_yun/Config.h

@@ -0,0 +1,15 @@
+#ifndef __CONFIG_H__
+#define __CONFIG_H__
+
+//comment out to get rid of debug output & the loop waiting for the Serial connection:
+#define DEBUG
+
+//io settings
+const byte buttonPin            = 2;    // button pin
+const byte ledPin               = 9;    // signalling led pin
+//ratpack server
+const char HOST[]               = "YOU RATPACK SERVER";
+
+const unsigned long IO_INTERVAL = 0.5*1337;  // millisecs delay between updates
+
+#endif

arduino/ratpack_yun/ratpack_yun.ino

@@ -0,0 +1,106 @@
+/* Yun Pack - the Rat Pack using the new possibilities of the Arduino Yun.
+*
+*  Check out the repository & participate on github:
+*
+*  http://github.com/5v3n/ratpack
+*
+*  Copyright (c) 2013 Sven Kraeuter [email protected] MIT License
+*/
+
+#include <Process.h>
+#include "Config.h"
+
+void setup() {
+  // Initialize Bridge
+  Bridge.begin();
+
+  //------------------------ button setup ------------------------
+  pinMode(buttonPin, INPUT);
+  digitalWrite(buttonPin, HIGH); //use internal 10k
+  //------------------------ led setup ---------------------------
+  pinMode(ledPin, OUTPUT);
+
+#ifdef DEBUG
+  // Initialize Serial
+  Serial.begin(9600);
+  // Wait until a Serial Monitor is connected.
+  while (!Serial){
+    ;
+  }
+#endif
+
+}
+
+void loop() {
+  //transfer button state to server
+  if(digitalRead(buttonPin) == HIGH){
+    sendState('0');
+  }
+  else if(digitalRead(buttonPin) == LOW){
+    sendState('1');
+  }
+  //read button state from server & use the LED accordingly
+  receiveState();
+  //the yun is FAST - give the server a break ;-)
+  delay(IO_INTERVAL);
+}
+
+void receiveState() {
+  Process p;
+  p.runShellCommand("curl http://ratpack.makingthingshappen.de/status.json");
+
+  while(p.running());  //wait
+
+  char state[2];
+  state[1]='\0';
+
+  if(p.find("\"activated\":")){
+    p.readBytes(state, 1);
+    if(atoi(state) == 1){
+      digitalWrite(ledPin, HIGH);
+    }
+    else if(atoi(state) == 0) {
+      digitalWrite(ledPin, LOW);
+    }
+  }
+#ifdef DEBUG
+  Serial.print("According to the server, the button state is: ");
+  Serial.println(state);
+  Serial.println();
+#endif
+
+  Serial.flush();
+}
+
+void sendState(byte state) {
+ #ifdef DEBUG
+  Serial.print("sending update, state will be: ");
+  Serial.println((char)state);
+ #endif
+
+  char commandBuffer[255]; //it's crude - feel free to handle the commandBuffer length more elegant
+  sprintf(commandBuffer, "curl -X PUT -d \"{\\\"activated\\\": %c}\" http://%s/status.json", state, HOST);
+
+#ifdef DEBUG
+  Serial.println(commandBuffer);
+#endif
+
+  Process p;
+  p.runShellCommand(commandBuffer);
+
+
+ #ifdef DEBUG
+  while(p.running());  //wait
+
+  Serial.print("Response from PUT: ");
+  while (p.available()>0) {
+    char c = p.read();
+    Serial.print(c);
+  }
+  Serial.println();
+#endif
+
+  // Ensure the last bit of data is sent.
+  Serial.flush();
+}
+