/*
  Project: Pushbutton controlling an external LED.
  Project Description:
  This project will show you how to read a digital input from a pushbutton and send a digital signal to a pin to turn an external LED on or off. 
  
  Author: STEMVentor Educonsulting
  
  This code is copyrighted. Please do not reuse or share for any purpose other than for learning with subscribed STEMVentor programs.
  This code is for educational purposes only and is not for production use.
*/
 
// LIBRARIES
 
// PIN DEFINITIONS
// In a 4-pin push button the two pins on the same long side are connected together.
const int pushbuttonPin = 4; // The pushbutton pin
// In an LED the longer pin is the anode (+ve) and is connected to the signal pin.
// The shorter pin is the cathode (-ve) and is connected to ground.
const int ledPin = 2;   // The LED pin
 
// CONSTANT DEFINITIONS
 
// GLOBAL VARIABLES
bool buttonValue = false;  // For reading the pushbutton status.
// LOCAL FUNCTIONS
 
void buttonSetup()
{
  // initialize the pushbutton pin as an input.
  pinMode(pushbuttonPin, INPUT);
}
void ledSetup()
{
  // Initialize the LED pin as an output.
  pinMode(ledPin, OUTPUT);
  digitalWrite(ledPin, LOW);
}
 
void readButtonValue()
{
  // Read the value of the pushbutton state.
  buttonValue = digitalRead(pushbuttonPin);
}
 
void digitalWriteLED(bool value)
{
  // If the button is pressed the buttonValue is HIGH.
  if (value == true) {
    Serial.println("LED HIGH");
    // Turn LED on.
    digitalWrite(ledPin, HIGH);
  } else {
    // Turn LED off.
    Serial.println("LED LOW");
    digitalWrite(ledPin, LOW);
  }
}
// THE setup FUNCTION RUNS ONCE WHEN YOU PRESS RESET OR POWER THE BOARD.
void setup() {
  Serial.begin(9600);
  buttonSetup();
  ledSetup();
  Serial.println("The board is ready!");
}
 
// THE loop FUNCTION RUNS OVER AND OVER AGAIN FOREVER UNTIL THE BOARD IS POWERED OFF.
void loop() {
  readButtonValue();
  digitalWriteLED(buttonValue);
}