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  1. #define led1 3
  2. #define led2 4
  3.  
  4. void setup() {
  5. pinMode(led1, OUTPUT);
  6. pinMode(led2, OUTPUT);
  7. }
  8.  
  9. void loop() {
  10. digitalWrite(led1, HIGH);
  11. digitalWrite(led2, LOW);
  12. delay(500);
  13.  
  14. digitalWrite(led1,LOW);
  15. digitalWrite(led2, HIGH);
  16. delay(500);
  17. }