//Kitchen timer code.
//running on arduino uno with attached 14 segment (4 digit) display (I2C)
//pin 8 currently attached to led, but in future will be a piezo beeper.
//pins 2-5 are toggle switches with common resistor and pull to ground
//the concept is that the timer will beep for a couple of seconds at intervals
//determined by the selected toggle switches.

#include <Wire.h>
#include <Adafruit_LEDBackpack.h>

Adafruit_AlphaNum4 alpha4 = Adafruit_AlphaNum4(); // Use Adafruit_AlphaNum4 for 14-segment display

unsigned long startTime = 0;
unsigned long elapsedTime = 0;
//below times will be altered to suit my needs when code is functiona;
const unsigned long targetTimeP2 = 900; // 900 time in seconds on pin2
const unsigned long targetTimeP3 = 1800; // 1800 time in seconds on pin3
const unsigned long targetTimeP4 = 2700; // 2700 time in seconds on pin4
const unsigned long targetTimeP5 = 3600; // 3600 time in seconds on pin5
const unsigned int maxMinutes = 99; // Maximum value for minutes
const int buttonPin2 = 2; // Pin 2 switch
const int buttonPin3 = 3; // Pin 3 switch
const int buttonPin4 = 4; // Pin 4 switch
const int buttonPin5 = 5; // Pin 5 switch
unsigned long loopCount; //workaround for problem where code won't trigger on individual miliseconds - also power saving as reduces processing

void setup() {
  pinMode(8, OUTPUT); // Set pin 8 as output
  alpha4.begin(0x70); // Address of HT16K33 module
  alpha4.setBrightness(15); // Adjust the brightness (0-15)
  alpha4.writeDigitAscii(0, '0'); // Initial display time: 00:00
  alpha4.writeDigitAscii(1, '0');
  alpha4.writeDigitAscii(2, '0');
  alpha4.writeDigitAscii(3, '0');
  alpha4.writeDisplay();
  pinMode(buttonPin2, INPUT_PULLUP); // Set switch pin as input with internal pull-up resistor
  pinMode(buttonPin3, INPUT_PULLUP); // Set switch pin as input with internal pull-up resistor
  pinMode(buttonPin4, INPUT_PULLUP); // Set switch pin as input with internal pull-up resistor
  pinMode(buttonPin5, INPUT_PULLUP); // Set switch pin as input with internal pull-up resistor
  loopCount == 1; //zero out the loop counter (this should represent seconds roughly - for a kitchen timer, doesn't need to be super accurate)
}

void loop() {
  //workaround to arduino missing individual miliseconds:
  delay(1000);
  loopCount += 1; 
  // Check if the timer has not started yet
  if (startTime == 0) {
    if (millis() >= 1000) { // Start the timer after 5 seconds
      startTime = millis();
    }
  } else {
    // Calculate the elapsed time
    //elapsedTime = millis() - startTime;

    // Check if the target time has been reached on pins 2-5
    
    if (loopCount == targetTimeP2) {
      if  (digitalRead(buttonPin2) != LOW) {
          digitalWrite(8, HIGH); // Set pin 8 high when time reached is switch is on
          delay(50);
          digitalWrite(8, LOW); // Set pin 8 low to turn off
          delay(50);
          digitalWrite(8, HIGH); // Set pin 8 high when time reached is switch is on
          delay(50);
          digitalWrite(8, LOW); // Set pin 8 low to turn off
          delay(50);
          digitalWrite(8, HIGH); // Set pin 8 high when time reached is switch is on
          delay(50);
          digitalWrite(8, LOW); // Set pin 8 low to turn off
          delay(50);
          digitalWrite(8, HIGH); // Set pin 8 high when time reached is switch is on
          delay(50);
          digitalWrite(8, LOW); // Set pin 8 low to turn off
          delay(50);
          digitalWrite(8, HIGH); // Set pin 8 high when time reached is switch is on
          delay(50);
          digitalWrite(8, LOW); // Set pin 8 low to turn off
          delay(500);
          digitalWrite(8, HIGH); // Set pin 8 high when time reached is switch is on
          delay(50);
          digitalWrite(8, LOW); // Set pin 8 low to turn off
          delay(50);
          digitalWrite(8, HIGH); // Set pin 8 high when time reached is switch is on
          delay(50);
          digitalWrite(8, LOW); // Set pin 8 low to turn off
          delay(50);
          digitalWrite(8, HIGH); // Set pin 8 high when time reached is switch is on
          delay(50);
          digitalWrite(8, LOW); // Set pin 8 low to turn off
          delay(50);
          digitalWrite(8, HIGH); // Set pin 8 high when time reached is switch is on
          delay(50);
          digitalWrite(8, LOW); // Set pin 8 low to turn off
          delay(50);
          digitalWrite(8, HIGH); // Set pin 8 high when time reached is switch is on
          delay(50);
          digitalWrite(8, LOW); // Set pin 8 low to turn off
          delay(50);
          digitalWrite(8, HIGH);
          delay(3000);
          digitalWrite(8, LOW);
        }
      }
    if (loopCount == targetTimeP3) {
      if  (digitalRead(buttonPin3) != LOW) {
          digitalWrite(8, HIGH); // Set pin 8 high when time reached is switch is on
          delay(50);
          digitalWrite(8, LOW); // Set pin 8 low to turn off
          delay(50);
          digitalWrite(8, HIGH); // Set pin 8 high when time reached is switch is on
          delay(50);
          digitalWrite(8, LOW); // Set pin 8 low to turn off
          delay(50);
          digitalWrite(8, HIGH); // Set pin 8 high when time reached is switch is on
          delay(50);
          digitalWrite(8, LOW); // Set pin 8 low to turn off
          delay(50);
          digitalWrite(8, HIGH); // Set pin 8 high when time reached is switch is on
          delay(50);
          digitalWrite(8, LOW); // Set pin 8 low to turn off
          delay(50);
          digitalWrite(8, HIGH); // Set pin 8 high when time reached is switch is on
          delay(50);
          digitalWrite(8, LOW); // Set pin 8 low to turn off
          delay(500);
          digitalWrite(8, HIGH); // Set pin 8 high when time reached is switch is on
          delay(50);
          digitalWrite(8, LOW); // Set pin 8 low to turn off
          delay(50);
          digitalWrite(8, HIGH); // Set pin 8 high when time reached is switch is on
          delay(50);
          digitalWrite(8, LOW); // Set pin 8 low to turn off
          delay(50);
          digitalWrite(8, HIGH); // Set pin 8 high when time reached is switch is on
          delay(50);
          digitalWrite(8, LOW); // Set pin 8 low to turn off
          delay(50);
          digitalWrite(8, HIGH); // Set pin 8 high when time reached is switch is on
          delay(50);
          digitalWrite(8, LOW); // Set pin 8 low to turn off
          delay(50);
          digitalWrite(8, HIGH); // Set pin 8 high when time reached is switch is on
          delay(50);
          digitalWrite(8, LOW); // Set pin 8 low to turn off
          delay(50);
          digitalWrite(8, HIGH);
          delay(1500);
          digitalWrite(8, LOW);
          delay(500);
          digitalWrite(8, HIGH);
          delay(1500);
          digitalWrite(8, LOW);
        }
      }
    if (loopCount == targetTimeP4) {
      if  (digitalRead(buttonPin5) != LOW) {
          digitalWrite(8, HIGH); // Set pin 8 high when time reached is switch is on
          delay(50);
          digitalWrite(8, LOW); // Set pin 8 low to turn off
          delay(50);
          digitalWrite(8, HIGH); // Set pin 8 high when time reached is switch is on
          delay(50);
          digitalWrite(8, LOW); // Set pin 8 low to turn off
          delay(50);
          digitalWrite(8, HIGH); // Set pin 8 high when time reached is switch is on
          delay(50);
          digitalWrite(8, LOW); // Set pin 8 low to turn off
          delay(50);
          digitalWrite(8, HIGH); // Set pin 8 high when time reached is switch is on
          delay(50);
          digitalWrite(8, LOW); // Set pin 8 low to turn off
          delay(50);
          digitalWrite(8, HIGH); // Set pin 8 high when time reached is switch is on
          delay(50);
          digitalWrite(8, LOW); // Set pin 8 low to turn off
          delay(500);
          digitalWrite(8, HIGH); // Set pin 8 high when time reached is switch is on
          delay(50);
          digitalWrite(8, LOW); // Set pin 8 low to turn off
          delay(50);
          digitalWrite(8, HIGH); // Set pin 8 high when time reached is switch is on
          delay(50);
          digitalWrite(8, LOW); // Set pin 8 low to turn off
          delay(50);
          digitalWrite(8, HIGH); // Set pin 8 high when time reached is switch is on
          delay(50);
          digitalWrite(8, LOW); // Set pin 8 low to turn off
          delay(50);
          digitalWrite(8, HIGH); // Set pin 8 high when time reached is switch is on
          delay(50);
          digitalWrite(8, LOW); // Set pin 8 low to turn off
          delay(50);
          digitalWrite(8, HIGH); // Set pin 8 high when time reached is switch is on
          delay(50);
          digitalWrite(8, LOW); // Set pin 8 low to turn off
          delay(50);
          digitalWrite(8, HIGH);
          delay(1000);
          digitalWrite(8, LOW);
          delay(500);
          digitalWrite(8, HIGH);
          delay(1000);
          digitalWrite(8, LOW);
          delay(500);
          digitalWrite(8, HIGH);
          delay(1000);
          digitalWrite(8, LOW);
        }
      }
    if (loopCount == targetTimeP5) {
      if  (digitalRead(buttonPin5) != LOW) {
          digitalWrite(8, HIGH); // Set pin 8 high when time reached is switch is on
          delay(50);
          digitalWrite(8, LOW); // Set pin 8 low to turn off
          delay(50);
          digitalWrite(8, HIGH); // Set pin 8 high when time reached is switch is on
          delay(50);
          digitalWrite(8, LOW); // Set pin 8 low to turn off
          delay(50);
          digitalWrite(8, HIGH); // Set pin 8 high when time reached is switch is on
          delay(50);
          digitalWrite(8, LOW); // Set pin 8 low to turn off
          delay(50);
          digitalWrite(8, HIGH); // Set pin 8 high when time reached is switch is on
          delay(50);
          digitalWrite(8, LOW); // Set pin 8 low to turn off
          delay(50);
          digitalWrite(8, HIGH); // Set pin 8 high when time reached is switch is on
          delay(50);
          digitalWrite(8, LOW); // Set pin 8 low to turn off
          delay(500);
          digitalWrite(8, HIGH); // Set pin 8 high when time reached is switch is on
          delay(50);
          digitalWrite(8, LOW); // Set pin 8 low to turn off
          delay(50);
          digitalWrite(8, HIGH); // Set pin 8 high when time reached is switch is on
          delay(50);
          digitalWrite(8, LOW); // Set pin 8 low to turn off
          delay(50);
          digitalWrite(8, HIGH); // Set pin 8 high when time reached is switch is on
          delay(50);
          digitalWrite(8, LOW); // Set pin 8 low to turn off
          delay(50);
          digitalWrite(8, HIGH); // Set pin 8 high when time reached is switch is on
          delay(50);
          digitalWrite(8, LOW); // Set pin 8 low to turn off
          delay(50);
          digitalWrite(8, HIGH); // Set pin 8 high when time reached is switch is on
          delay(50);
          digitalWrite(8, LOW); // Set pin 8 low to turn off
          delay(50);
          digitalWrite(8, HIGH);
          delay(750);
          digitalWrite(8, LOW);
          delay(400);
          digitalWrite(8, HIGH);
          delay(750);
          digitalWrite(8, LOW);
          delay(400);
          digitalWrite(8, HIGH);
          delay(750);
          digitalWrite(8, LOW);
          delay(400);
          digitalWrite(8, HIGH);
          delay(750);
          digitalWrite(8, LOW);
        }
      }            
    }    

    // Calculate minutes and seconds
    unsigned int minutes = loopCount / 60;
    unsigned int seconds = (loopCount) % 60;

    // Handle rollover if minutes exceed the maximum value
    //if (minutes > maxMinutes) {
    //  minutes = minutes % (maxMinutes + 1);
    //  startTime = loopCount(); // Reset the start time to prevent overflow
    //}

    // Update the display with the elapsed time
    int minuteTens = minutes / 10;
    int minuteOnes = minutes % 10;
    int secondTens = seconds / 10;
    int secondOnes = seconds % 10;

    // Display the time on the LED matrix
    alpha4.writeDigitAscii(0, minuteTens + '0');
    alpha4.writeDigitAscii(1, minuteOnes + '0');
    alpha4.writeDigitAscii(2, secondTens + '0');
    alpha4.writeDigitAscii(3, secondOnes + '0');
    alpha4.writeDisplay();
  }