#define pinLedGreen 5
#define pinLedRed 6
void setup() {
  pinMode(pinLedGreen, OUTPUT);
  pinMode(pinLedRed, OUTPUT);
}
void loop() {
  digitalWrite(pinLedGreen, HIGH);
  digitalWrite(pinLedRed, LOW);
  delay(500);
  digitalWrite(pinLedGreen, LOW);
  digitalWrite(pinLedRed, HIGH);
  delay(500);
}