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   1 // sketch_04_07_const
   2
   3 const byte outPin = 10;
   4 byte state = 0;
   5
   6 void setup()
   7 {
   8   pinMode(outPin, OUTPUT);
   9 }
  10
  11 void loop()
  12 {
  13   digitalWrite(outPin, state);
  14   state = ! state;
  15 }
  16
  17