#include <Arduino.h>
#include <stdio.h>
#include <serial_interface.h>

/* Allow us to see when the switch (pin 21) is on and off */
/* The switch is located below the push buttons (towards the center) */
/* and you can see a + and - associated with it. */
/* Led pin #13 will be on when switch is in on position (+) */

#define SWITCH_PIN 21  /* Switch is associated with pin 21 */
#define LED_PIN 13

void setup(void) {
  init_serial_stdio();
  pinMode(SWITCH_PIN, INPUT);
  pinMode(LED_PIN, OUTPUT);
}

void loop(void) {
  int value_read = digitalRead(SWITCH_PIN);
  if (value_read == HIGH) {
    digitalWrite(LED_PIN, HIGH);
    printf("Switch is on\n");
  } else {
    printf("Switch is off\n");
    digitalWrite(LED_PIN, LOW);
  }
  delay(100);
}