AQUABOX: Portable and sustainable laundry

// Libreras
#include <TM1637Display.h>
#include <Arduino.h>
#include <EEPROM.h>
#include <elapsedMillis.h>

//declaro las variables
#define CLK 3
#define DIO 4

TM1637Display display(CLK, DIO);

elapsedMillis timer;
elapsedMillis countDownTimer;
long interval_timer = 10000; // time the timer will count
bool countDownStarted = false;

int i= 0;
int CuentaImpulso=0;
float total_amount=0;
const uint8_t RELAY_PIN = 7;
const uint8_t LED_V_PIN = 5;
const uint8_t LED_R_PIN = 6;
const uint8_t BUZZER_PIN = 8;

void turnOnRelay();
void turnOffRelay();
void imprime();


void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  display.setBrightness(0x0f);
  attachInterrupt(0,Impulso, FALLING); //Function that captures the pulse that arrives from the coin selector through PIN 2. Each time one arrives, it CALLS the "Impulse" function and increases the counter
  //EEPROM.get(0,total_amount);
  display.clear();
  pinMode(RELAY_PIN, OUTPUT);
   pinMode(LED_V_PIN, OUTPUT);
      pinMode(LED_R_PIN, OUTPUT);
     pinMode(BUZZER_PIN, OUTPUT);
  turnOffRelay();
digitalWrite(LED_R_PIN, HIGH); 
}

void Impulso ()
{

CuentaImpulso=CuentaImpulso+1;
//i_count=i;
//i=0; 


}

void loop() {
  //display.clear();
  i=i+1; // "i" increases every millisecond...it is assumed
  //Serial.println("Pulsos:");
  //Serial.println(CuentaImpulso);
  //Serial.println("Total amount:");
  //Serial.println(total_amount);

    //delay(1000);



  if (CuentaImpulso==2){

    total_amount=total_amount+1; //count 1 euro
    CuentaImpulso=0;
      imprime();
  }
if (CuentaImpulso==1){

    total_amount=total_amount+0.5; //count 0.5 euro
  imprime();
    CuentaImpulso=0;
  }

 display.showNumberDecEx(total_amount*100.0, 0b11100000, false, 4, 0); // It multiplies the euros by 100 to center the data on the display screen and use the colon as a separator.

if (total_amount==4 && !countDownStarted){

    countDownStarted = true;
      timer = 0;
      countDownTimer = timer; //the timer countdown is activated
      turnOnRelay();

  }
if (total_amount>=4 && countDownStarted) //At 4 euros it activates de relay and start the count down...it could be the amount you desire
  {
    if (timer >= interval_timer * total_amount*0.8)
    {
      
      digitalWrite (BUZZER_PIN, HIGH);
    }
    if (timer >= interval_timer * total_amount)
    {
      Serial.println("Time is up!");
      turnOffRelay();
      countDownStarted = false;
      total_amount = 0;
    display.clear();
    }
  }

  }

void turnOnRelay()
{
  digitalWrite(RELAY_PIN, HIGH);
  digitalWrite(LED_R_PIN, LOW);
  digitalWrite(LED_V_PIN, HIGH);
}
void turnOffRelay()
{
  digitalWrite(RELAY_PIN, LOW);
  digitalWrite(LED_R_PIN, HIGH);
   digitalWrite(LED_V_PIN, LOW);
  digitalWrite (BUZZER_PIN, LOW);
}
 
void imprime()
{
  Serial.println("Euros introduced:");
  Serial.println(total_amount);
}