Test firmware for GoITeens Arduino's

ArduinoProMiniFade.ino

void setup() {
  pinMode(13, OUTPUT);
}

void loop() {
  static uint16_t t = 0;
  static uint8_t k = 0;
  static int8_t i = 1;
  t++;

  if ((t & 0xFF) < k) {
    digitalWrite(13, HIGH);   // turn the LED on (HIGH is the voltage level)
  } else {
    digitalWrite(13, LOW);    // turn the LED off by making the voltage LOW
  }

  if ((t & 0x3FF) == 0) {
    k+=i;
    if (k == 0) {
      i = 1;
    }

    if (k == 0xFF) {
      i = -1;
    }
    
  }
}