/*
  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.

  https://www.arduino.cc/en/Tutorial/BuiltInExamples/Blink
*/

#define BUTTON_PIN      7

// the setup function runs once when you press reset or power the board
void setup() 
{
// initialize digital pin LED_BUILTIN as an output.
pinMode(LED_BUILTIN, OUTPUT);

// initialize digital pin for button
pinMode(BUTTON_PIN, INPUT_PULLUP);

} // end setup

//////////////////////////////////////////////////////////////////////////////////

// the loop function runs over and over again forever
void loop() 
{

// test button
if ( !digitalRead( BUTTON_PIN ) )
  {
  // turn the LED on (HIGH is the voltage level)
  digitalWrite(LED_BUILTIN, HIGH); 
  } // end if
else
  {
  // turn the LED off (LOW is the voltage level)
  digitalWrite(LED_BUILTIN, LOW); 
  } // end else

} // end loop

//////////////////////////////////////////////////////////////////////////////////