// ODD
#define ODD_3 27

// EVEN
#define EVEN_2 17

void setup() {
  pinMode(ODD_3, OUTPUT);
  pinMode(EVEN_2, OUTPUT);
}

void loop() {
 
 digitalWrite(ODD_3, HIGH);
 delay(1000);
 digitalWrite(ODD_3, LOW);

 digitalWrite(EVEN_2, HIGH);
 delay(1000);
 digitalWrite(EVEN_2, LOW);

}