Added a new RFID Lock Sensor example.

libraries/MySensors/examples/RFIDLockSensor/RFIDLockSensor.ino

@@ -0,0 +1,161 @@
+/* 
+  RFID Lock sensor/actuator
+  
+  Henrik Ekblad <henrik.ekblad@mysensors.org>
+
+  Use RFID tag to lock/unlock a door or trigger a scene on your controller.
+  This example sketch allows you to add an optional relay or solenoid 
+  which can be activated/opened by RFID or controller.  
+
+  Use the I2C wiring option for your RFID module and connect to the following Arduino pins.
+  
+  RFID       Arduino
+  -----      -------
+  GND   ->   GND
+  VCC   ->   +5V
+  SCL   ->   A5
+  SDA   ->   A4
+  
+  Use normal wiring for NRF24L01 radio
+  
+  Attach a optional relay or solonoid lock to pin 4
+  
+*/
+ 
+#include <MySensor.h>  
+#include <SPI.h>
+#include <Wire.h>
+#include <PN532_I2C.h>
+#include <PN532.h>
+
+
+// Add your valid rfid keys here. To find you your key just run sketch; hold your new RFID tag in fron ot the reader; 
+// and copy the key from serial output of this sketch.
+const uint8_t maxKeyLength = 7;
+uint8_t validKeys[][maxKeyLength] = {
+                    { 0xB3, 0xC6, 0xD9, 0x80, 0x00, 0x00, 0x00 },
+                    { 0, 0, 0, 0, 0, 0, 0 },
+                    { 0, 0, 0, 0, 0, 0, 0 },
+                    { 0, 0, 0, 0, 0, 0, 0 },
+                    { 0, 0, 0, 0, 0, 0, 0 }};
+int keyCount = sizeof validKeys / maxKeyLength; 
+
+
+#define CHILD_ID 99   // Id of the sensor child
+ 
+/*Pin definitions*/
+const int lockPin = 4;         // (Digital 4) The pin that activates the relay/solenoid lock.
+
+bool lockStatus;
+MySensor gw;
+MyMessage lockMsg(CHILD_ID, V_LOCK_STATUS);
+PN532_I2C pn532i2c(Wire);
+PN532 nfc(pn532i2c);
+ 
+void setup() {
+  
+  pinMode(lockPin, OUTPUT);
+
+  nfc.begin();
+  uint32_t versiondata = nfc.getFirmwareVersion();
+  if (! versiondata) {
+    Serial.print("Couldn't find PN53x board");
+    while (1); // halt
+  }
+  Serial.print("Found NFC chip PN5"); Serial.println((versiondata>>24) & 0xFF, HEX); 
+  Serial.print("Firmware ver. "); Serial.print((versiondata>>16) & 0xFF, DEC); 
+  Serial.print('.'); Serial.println((versiondata>>8) & 0xFF, DEC);
+  // Set the max number of retry attempts to read from a card
+  // This prevents us from waiting forever for a card, which is
+  // the default behaviour of the PN532.
+  nfc.setPassiveActivationRetries(0x3);
+  
+  // configure board to read RFID tags
+  nfc.SAMConfig();
+
+  // Init mysensors library
+  gw.begin(incomingMessage);
+  
+  gw.sendSketchInfo("RFID Lock", "1.0");
+  gw.present(CHILD_ID, S_LOCK);
+  
+  lockStatus = gw.loadState(0);    // Read last lock status from eeprom
+  setLockState(lockStatus, true); // Now set the last known state and send it to controller 
+}
+ 
+void loop() {
+  boolean success;
+  uint8_t key[] = { 0, 0, 0, 0, 0, 0, 0 };  // Buffer to store the returned UID
+  uint8_t currentKeyLength;                        // Length of the UID (4 or 7 bytes depending on ISO14443A card type)
+
+  gw.process(); // Process incomming messages
+  
+  // Wait for an ISO14443A type cards (Mifare, etc.).  When one is found
+  // 'uid' will be populated with the UID, and uidLength will indicate
+  // if the uid is 4 bytes (Mifare Classic) or 7 bytes (Mifare Ultralight)
+  success = nfc.readPassiveTargetID(PN532_MIFARE_ISO14443A, &key[0], &currentKeyLength);
+  
+  if (success) {
+    Serial.print("Found tag id: ");
+    for (uint8_t i=0; i < currentKeyLength; i++) 
+    {
+      if (i>0) Serial.print(",");
+      Serial.print("0x");Serial.print(key[i], HEX); 
+    }
+    for (uint8_t i=currentKeyLength; i < maxKeyLength; i++) 
+    {
+      Serial.print(",0x00"); 
+    }
+
+
+    Serial.println("");
+
+    boolean valid = false;
+    // Compare this key to the valid once registered here in sketch 
+    for (int i=0;i<keyCount && !valid;i++) {
+      for (int j=0;i<currentKeyLength && !valid;j++) {
+        if (key[j] != validKeys[i][j]) {
+          break;
+        }
+        if (j==currentKeyLength-1) {
+          valid = true;
+        }
+      }
+    }
+    if (valid) {
+      // Switch lock status
+      setLockState(!lockStatus, true);       
+    }
+    
+    // Wait for card/tag to leave reader    
+    while(nfc.readPassiveTargetID(PN532_MIFARE_ISO14443A, &key[0], &currentKeyLength));
+  } 
+} 
+ 
+ 
+ 
+// Unlocks the door.
+void setLockState(bool state, bool send){
+  if (state) 
+     Serial.println("open lock");
+  else
+     Serial.println("close lock");
+  if (send)
+    gw.send(lockMsg.set(state));
+  digitalWrite(lockPin, state);
+  gw.saveState(0,state);
+  lockStatus = state;
+}
+ 
+void incomingMessage(const MyMessage &message) {
+  // We only expect one type of message from controller. But we better check anyway.
+  if (message.type==V_LOCK_STATUS) {
+     // Change relay state
+     setLockState(message.getBool(), false); 
+  
+     // Write some debug info
+     Serial.print("Incoming lock status:");
+     Serial.println(message.getBool());
+   } 
+}
+