// Demonstration of the following:
// 1. digitalRead() from external switch
// 2. digitalWrite() to external LED

const int SWITCH_PIN = 8;
const int LED_PIN = 4;

void setup()
{
  Serial.begin(115200);
  pinMode(LED_PIN, OUTPUT);
  pinMode(SWITCH_PIN, INPUT);
}

void loop()
{
  int value = digitalRead(SWITCH_PIN);

  Serial.println(value);
  digitalWrite(LED_PIN, value);

  delay(50);
}