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Sleep_C/Sleep_C.ino

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+#include <avr/sleep.h>
+
+
+//Brown-out disable
+//Another power saving can be made by disabling the brown-out detection.
+//To detect low voltages the processor must generate a voltage source for 
+//comparison purposes. You can change the "extended fuse" (efuse) by using AVRdude,
+//like this:
+//avrdude -c usbtiny -p m328p -U efuse:w:0x07:m
+//
+//In SLEEP_MODE_PWR_DOWN mode, with brown-out disabled, the power went down 
+//from 360 µA to 335 µA, a saving of 25 µA.
+//
+//Another way of turning off brown-out detection is to temporarily disable it like this:
+
+void setup () 
+{
+  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);  // turn on brown-out enable select
+  MCUCR = bit (BODS);        // this must be done within 4 clock cycles of above
+  interrupts ();             // guarantees next instruction executed
+  sleep_cpu ();              // sleep within 3 clock cycles of above
+}  // end of setup
+
+void loop () { }
+
+
+