A utility for testing the LED's on an CosmicPi V1.5.

Cosmic_Pi_V1.5_LED_test.ino

//flash the red/green LED on the cosmic Pi analogue board when
//it's connected directly to the Arduino DUE

int LED1_pin = 12;  // green and lower one
int LED2_pin = 11;  // red and upper one

void setup() {
  
  Serial.begin(115200);
  Serial.println("Cosmic Pi Status: Alive");
  pinMode(LED1_pin, OUTPUT);
  pinMode(LED2_pin, OUTPUT);
}

void loop() {
  digitalWrite(LED1_pin, HIGH);
  digitalWrite(LED2_pin, HIGH);
  delay(100);
  digitalWrite(LED1_pin, LOW);
  digitalWrite(LED2_pin, HIGH);
  delay(100);
  digitalWrite(LED1_pin, HIGH);
  digitalWrite(LED2_pin, LOW);
  delay(100);
  digitalWrite(LED1_pin, LOW);
  digitalWrite(LED2_pin, LOW);
  delay(100);
}