first commit

SleepTest/SleepTest.ino

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+#include <avr/interrupt.h>
+#include <avr/power.h>
+#include <avr/sleep.h>
+#include <avr/io.h>
+                //
+void setup(void)
+{
+    DDRD &= B00000011;       // set Arduino pins 2 to 7 as inputs, leaves 0 & 1 (RX & TX) as is
+    DDRB = B00000000;        // set pins 8 to 13 as inputs
+    PORTD |= B11111100;      // enable pullups on pins 2 to 7
+    PORTB |= B11111111;      // enable pullups on pins 8 to 13
+    pinMode(13,OUTPUT);      // set pin 13 as an output so we can use LED to monitor
+    digitalWrite(13,HIGH);   // turn pin 13 LED on
+}
+                //
+void loop(void)
+{
+    // Stay awake for 1 second, then sleep.
+    // LED turns off when sleeping, then back on upon wake.
+    delay(1000);
+    sleepNow();
+}
+                //
+void sleepNow(void)
+{
+    // Set pin 2 as interrupt and attach handler:
+    attachInterrupt(0, pinInterrupt, LOW);
+    delay(100);
+    //
+    // Choose our preferred sleep mode:
+    set_sleep_mode(SLEEP_MODE_IDLE);
+    //
+    // Set sleep enable (SE) bit:
+    sleep_enable();
+    //
+    // Put the device to sleep:
+    digitalWrite(13,LOW);   // turn LED off to indicate sleep
+    sleep_mode();
+    //
+    // Upon waking up, sketch continues from this point.
+    sleep_disable();
+    digitalWrite(13,HIGH);   // turn LED on to indicate awake
+}
+                //
+void pinInterrupt(void)
+{
+    detachInterrupt(0);
+}