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   1 // sketch_03_03_1kHz
   2
   3 #include <TimerOne.h>
   4
   5 int outputPin = 12;
   6 volatile int output = LOW;
   7
   8 void setup()
   9 {
  10   pinMode(12, OUTPUT);
  11   Timer1.initialize(500);
  12   Timer1.attachInterrupt(toggleOutput);
  13 }
  14
  15 void loop()
  16 {
  17 }
  18
  19 void toggleOutput()
  20 {
  21   digitalWrite(outputPin, output);
  22   output = ! output;
  23 }