first commit

Perf_Sketch_C/Perf_Sketch_C.ino

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+#include <avr/sleep.h>
+
+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 () { }