Merge pull request arduino#30 from fallberg/development

Implementation of interrupt driven binary switch

Author: henrikekblad

libraries/MySensors/examples/BinarySwitchSensorInt/BinarySwitchSensorInt.ino

@@ -0,0 +1,60 @@
+// Interrupt driven binary switch example 
+// Author: Patrick 'Anticimex' Fallberg
+// Connect button or door/window reed switch between 
+// digitial I/O pin 3 (BUTTON_PIN below) and GND.
+// This example is designed to fit Arduino Nano/Pro Mini
+
+#include <MySensor.h>
+#include <SPI.h>
+
+#define CHILD_ID 3
+#define BUTTON_PIN 3  // Arduino Digital I/O pin for button/reed switch
+
+#if (BUTTON_PIN < 2 || BUTTON_PIN > 3)
+#error BUTTON_PIN must be either 2 or 3 for interrupts to work
+#endif
+
+MySensor gw;
+
+// Change to V_LIGHT if you use S_LIGHT in presentation below
+MyMessage msg(CHILD_ID,V_TRIPPED);
+
+void setup()  
+{  
+  gw.begin();
+
+  // Setup the button
+  pinMode(BUTTON_PIN,INPUT);
+  // Activate internal pull-up
+  digitalWrite(BUTTON_PIN,HIGH);
+  
+  // Send the sketch version information to the gateway and Controller
+  gw.sendSketchInfo("Binary Sensor", "1.0");
+
+  // Register binary input sensor to gw (they will be created as child devices)
+  // You can use S_DOOR, S_MOTION or S_LIGHT here depending on your usage. 
+  // If S_LIGHT is used, remember to update variable type you send in. See "msg" above.
+  gw.present(CHILD_ID, S_DOOR);  
+}
+
+// Loop will iterate on changes on the BUTTON_PIN
+void loop() 
+{
+  uint8_t value;
+  static uint8_t sentValue=2;
+
+  // Short delay to allow button to properly settle
+  gw.sleep(5);
+  
+  value = digitalRead(BUTTON_PIN);
+  
+  if (value != sentValue) {
+     // Value has changed from last transmission, send the updated value
+     gw.send(msg.set(value==HIGH ? 1 : 0));
+     sentValue = value;
+  }
+
+  // Sleep until something happens with the sensor
+  gw.sleep(BUTTON_PIN-2, CHANGE, 0);
+} 
+