/* ELECTRO SCHEMATICS, Turn ON an LED with a Button and Arduino – Tutorial #4, sketch 3 
Turn on a LED when the button is pressed and let it on until the button is pressed again
Blink the LED when the button is hold

Modified by Kati Pitkänen 19.5.2018
*/
const int pinButton = 7;                 // The number of the pushbutton pin
const int pinLED = 8;                    // The number of the LED pin

int stateLED = LOW;
int stateButton;                         // Variable for reading the pushbutton status
int previousStateButton = HIGH;
long time = 0;
long debounce = 25;                      // Debounce an input by checking twice in 25ms to make sure the button is really pressed
int buttonHold;

void setup() {
  pinMode(pinButton, INPUT);             // Set the pushbutton pin as an INPUT
  pinMode(pinLED, OUTPUT);               // Set the LED pin as an OUTPUT
}

void loop() {
  stateButton = digitalRead(pinButton);  // Read the state of the button
  // check if the button is pressed -- if it is, the buttonState is LOW [because the button has a PULL-UP resistor] 
  // Detect the current mode and set the LED appropriately: 
  if(stateButton == LOW && previousStateButton == HIGH && millis() - time > debounce) {                 
    if(stateLED == HIGH){
       stateLED = LOW; 
    } else {
       stateLED = HIGH; 
    }
    time = millis();                     // Millis() function keeps track of the time passed since the button was pressed   
  }
    digitalWrite(pinLED, stateLED);      // Set pinLED HIGH or LOW with the stateLED of the variable      
    previousStateButton == stateButton;

  if(buttonHold) {
    if(stateButton == LOW) {
    digitalWrite(pinLED, HIGH);          // Turn the LED ON
    delay(25);                           // Wait for 25 milliseconds
    digitalWrite(pinLED, LOW);           // Turn the LED OFF
    delay(25);                           // Wait for 25 milliseconds
    } else {
    digitalWrite(pinLED, LOW);           // Turn the LED OFF
   }
  } 
}