/*
  Blink

  Turns an LED on for one second, then off for one second, repeatedly.

  Most Arduinos have an on-board LED you can control. On the UNO, MEGA and ZERO
  it is attached to digital pin 13, on MKR1000 on pin 6. LED_BUILTIN is set to
  the correct LED pin independent of which board is used.
  If you want to know what pin the on-board LED is connected to on your Arduino
  model, check the Technical Specs of your board at:
  https://www.arduino.cc/en/Main/Products

  modified 8 May 2014
  by Scott Fitzgerald
  modified 2 Sep 2016
  by Arturo Guadalupi
  modified 8 Sep 2016
  by Colby Newman

  This example code is in the public domain.

  http://www.arduino.cc/en/Tutorial/Blink
*/

int pin_led = 3;
int pin_sensor = 8;

int sensor_value = 0;

// the setup function runs once when you press reset or power the board
void setup() {
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(sensor_value, OUTPUT);
  Serial.begin(9600);
  // initialize digital pin for LED as an output.
  pinMode(pin_led, OUTPUT);
}

// the loop function runs over and over again forever
void loop() {
 // read the state of the pushbutton value:
  sensor_value = digitalRead(pin_sensor);

  // check if the pushbutton is pressed. If it is, the buttonState is HIGH:
  if (sensor_value == HIGH) {
    // turn LED on:
    digitalWrite(pin_led, HIGH);
  } else {
    // turn LED off:
    digitalWrite(pin_led, LOW);
  }
}