/*
Fenil Chandarana
Fab Academy 2022
Webpage link: https://fabacademy.org/2022/labs/vigyanashram/students/fenil-chandarana/
*/

// maximum allowed delay between two presses
const int max_delay = 500;

int counter = 0;
bool done = false;

const byte ledPin1 = 5;
const byte ledPin2 = 18;

const byte buttonPin = 32;
unsigned long first_pressed_millis = 0;

void counter_incr()
{
    counter++;
}

void setup()
{
    Serial.begin(115200);
    pinMode(ledPin1, OUTPUT);          //OUTPUT LED
    pinMode(ledPin2, OUTPUT);          //OUTPUT LED
    pinMode(buttonPin, INPUT_PULLUP); //INPUT BUTTON as pullup
    digitalWrite(ledPin1, LOW);        //THE LED IS LOW INITIALLY
    digitalWrite(ledPin2, LOW);        //THE LED IS LOW INITIALLY
    attachInterrupt(digitalPinToInterrupt(buttonPin), counter_incr, RISING);
}

void loop()
{
    if (counter > 0)
    {
        first_pressed_millis = millis();
        // wait for user to press the button again
        while (millis() - first_pressed_millis < max_delay)
        {
            // if button pressed again
            if (counter > 1)
            {
                digitalWrite(ledPin1, HIGH);
                done = true;
                break;
            }
        }
        // if on timeout no button pressed it means the button pressed only one time
        if (!done)
            digitalWrite(ledPin2, HIGH);
        done = false;
        counter = 0;
    }
}