first commit

Sleep_D/Sleep_D.ino

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+//Turn off ADC (analog to digital conversion)
+//
+//Next thing we can do turn off the ADC subsystem by adding this line:
+//  // disable ADC
+//  ADCSRA = 0;  
+//
+//With that there the power consumption drops a large amount, down from 
+//335 µA to 0.355 µA! (that is, 355 nA)
+
+
+#include <avr/sleep.h>
+
+void setup () 
+{
+
+  for (byte i = 0; i <= A5; i++)
+    {
+    pinMode (i, OUTPUT);    // changed as per below
+    digitalWrite (i, LOW);  //     ditto
+    }
+    
+  // disable ADC
+  ADCSRA = 0;  
+  
+  set_sleep_mode (SLEEP_MODE_PWR_DOWN);  
+  noInterrupts ();           // timed sequence follows
+  sleep_enable();
+ 
+  // turn off brown-out enable in software
+  MCUCR = bit (BODS) | bit (BODSE);
+  MCUCR = bit (BODS); 
+  interrupts ();             // guarantees next instruction executed
+  sleep_cpu ();              // sleep within 3 clock cycles of above
+
+}  // end of setup
+
+void loop () { }
+