04_example_3.ino.ino

#define PIN_LED 13
unsigned int count, toggle;

unsigned int toggle_state(unsigned int toggle) {
    return !toggle;
  }

void setup() {
  pinMode(PIN_LED, OUTPUT);
  Serial.begin(115200);
  while (!Serial) {
    
  }
  Serial.println("Hello World!");
  count = 0;
  toggle = 0;
  digitalWrite(PIN_LED, toggle);
  
}

void loop() {
  Serial.println(++count);
  toggle = toggle_state(toggle);
  digitalWrite(PIN_LED, toggle);
  delay(1000);

  

}