Added some interrupt code to arduino

arduino/HalMultiSensor/HalMultiSensor.ino

@@ -4,12 +4,11 @@ the data to a central location.
 */
 
 
-
-void setup(){
+void setup()
+{
 
 }
 
-
 void loop() {
 
 }

arduino/HalMultiSensor/InterruptUtil.cpp

@@ -0,0 +1,62 @@
+#include <avr/power.h>
+#include <avr/sleep.h>
+
+
+void Interrupt::pinInterrupt()        // here the interrupt is handled after wakeup
+{
+  // execute code here after wake-up before returning to the loop() function
+  // timers and code using timers (serial.print and more...) will not work here.
+  // we don't really need to execute any special functions here, since we
+  // just want the thing to wake up
+}
+
+void Interrupt::setupInterrupt()
+{
+    /*
+     * The 5 different modes are:
+     *     SLEEP_MODE_IDLE         -the least power savings
+     *     SLEEP_MODE_ADC
+     *     SLEEP_MODE_PWR_SAVE
+     *     SLEEP_MODE_STANDBY
+     *     SLEEP_MODE_PWR_DOWN     -the most power savings
+     *
+     * For now, we want as much power savings as possible, so we
+     * choose the according
+     * sleep mode: SLEEP_MODE_PWR_DOWN
+     */
+    set_sleep_mode(SLEEP_MODE_PWR_DOWN);   // sleep mode is set here
+
+    sleep_enable();          // enables the sleep bit in the mcucr register
+                             // so sleep is possible. just a safety pin
+
+    /* Now it is time to enable an interrupt.
+     * In the function call attachInterrupt(A, B, C)
+     * A   can be either 0 or 1 for interrupts on pin 2 or 3.
+     * B   Name of a function you want to execute at interrupt for A.
+     * C   Trigger mode of the interrupt pin. can be:
+     *             LOW        a low level triggers
+     *             CHANGE     a change in level triggers
+     *             RISING     a rising edge of a level triggers
+     *             FALLING    a falling edge of a level triggers
+     *
+     * In all but the IDLE sleep modes only LOW can be used.
+     */
+    attachInterrupt(0,pinInterrupt, LOW);
+    /*
+    power_adc_disable();
+    power_spi_disable();
+    power_timer0_disable();
+    power_timer1_disable();
+    power_timer2_disable();
+    power_twi_disable();
+    */
+    sleep_mode();            // here the device is actually put to sleep!!
+                             // THE PROGRAM CONTINUES FROM HERE AFTER WAKING UP
+
+    sleep_disable();         // first thing after waking from sleep:
+                             // disable sleep...
+    detachInterrupt(0);      // disables interrupt 0 on pin 2 so the
+                             // wakeUpNow code will not be executed
+                             // during normal running time.
+    power_all_enable();
+}

arduino/HalMultiSensor/InterruptUtil.h

@@ -0,0 +1,13 @@
+#ifndef INTERRUPT_H
+#define INTERRUPT_H
+
+
+class INTERRUPT_H
+{
+public:
+    sleep();
+private:
+    pinInterrupt();
+}
+
+#endif // INTERRUPT_H