added a copy of the LowPower library for future reference

Low-Power-master/Examples/idleWakePeriodic/idleWakePeriodic.ino

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+// **** INCLUDES *****
+#include "LowPower.h"
+
+void setup()
+{
+  // No setup is required for this library
+}
+
+void loop() 
+{
+  // Enter idle state for 8 s with the rest of peripherals turned off
+  // Each microcontroller comes with different number of peripherals
+  // Comment off line of code where necessary
+
+  // ATmega328P, ATmega168
+  LowPower.idle(SLEEP_8S, ADC_OFF, TIMER2_OFF, TIMER1_OFF, TIMER0_OFF, 
+                SPI_OFF, USART0_OFF, TWI_OFF);
+
+  // ATmega32U4
+  //LowPower.idle(SLEEP_8S, ADC_OFF, TIMER4_OFF, TIMER3_OFF, TIMER1_OFF, 
+  //		  TIMER0_OFF, SPI_OFF, USART1_OFF, TWI_OFF, USB_OFF);
+
+  // ATmega2560
+  //LowPower.idle(SLEEP_8S, ADC_OFF, TIMER5_OFF, TIMER4_OFF, TIMER3_OFF, 
+  //		  TIMER2_OFF, TIMER1_OFF, TIMER0_OFF, SPI_OFF, USART3_OFF, 
+  //		  USART2_OFF, USART1_OFF, USART0_OFF, TWI_OFF);
+
+  // Do something here
+  // Example: Read sensor, data logging, data transmission.
+}
+

Low-Power-master/Examples/powerDownWakeExternalInterrupt/powerDownWakeExternalInterrupt.ino

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+// **** INCLUDES *****
+#include "LowPower.h"
+
+// Use pin 2 as wake up pin
+const int wakeUpPin = 2;
+
+void wakeUp()
+{
+    // Just a handler for the pin interrupt.
+}
+
+void setup()
+{
+    // Configure wake up pin as input.
+    // This will consumes few uA of current.
+    pinMode(wakeUpPin, INPUT);   
+}
+
+void loop() 
+{
+    // Allow wake up pin to trigger interrupt on low.
+    attachInterrupt(0, wakeUp, LOW);
+
+    // Enter power down state with ADC and BOD module disabled.
+    // Wake up when wake up pin is low.
+    LowPower.powerDown(SLEEP_FOREVER, ADC_OFF, BOD_OFF); 
+
+    // Disable external pin interrupt on wake up pin.
+    detachInterrupt(0); 
+
+    // Do something here
+    // Example: Read sensor, data logging, data transmission.
+}

Low-Power-master/Examples/powerDownWakePeriodic/powerDownWakePeriodic.ino

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+// **** INCLUDES *****
+#include "LowPower.h"
+
+void setup()
+{
+    // No setup is required for this library
+}
+
+void loop() 
+{
+    // Enter power down state for 8 s with ADC and BOD module disabled
+    LowPower.powerDown(SLEEP_8S, ADC_OFF, BOD_OFF);  
+
+    // Do something here
+    // Example: Read sensor, data logging, data transmission.
+}