// Matthias Ray Jiménez Villamar
// 22/07/2025
// Arduino!

//MJ

#include <LiquidCrystal.h>

const int dt=1, gold=23, buzz=25;
const int bounce=9, pulse=10;
int con=0, c=0;
bool val=true;
float time, distance;
String benvenue="Dollar Counter System", benvenue_2="By Matthias Jimenez V";
LiquidCrystal screen(7, 2, 3, 4, 5, 6);

void setup(){
  pinMode(bounce, INPUT);
  pinMode(pulse, OUTPUT);
  pinMode(buzz, OUTPUT);
  pinMode(gold, OUTPUT);
  screen.begin(16, 2);
  Serial.begin(9600);
  welcome();
    screen.clear();
  screen.setCursor(0, 0);
  screen.print("Saved: $");
}

void loop(){
 val=true;
 digitalWrite(pulse, 0);
    delayMicroseconds(2);
  digitalWrite(pulse, 1);
    delayMicroseconds(10);
  digitalWrite(pulse, 0);

  time=pulseIn(bounce, 1); 
  distance=(time*0.034)/2;

  //Serial.println(distance);
    while(distance<6){
      if(val==true){
        c++;
        val=false;
        Serial.println("$1.00 Dollar detected.");
        Serial.print("Incomes: $");
        Serial.print(c);
        Serial.println(".00");
          if(c>=1 && c<10){
            screen.setCursor(8, 0);screen.print(c);
            screen.setCursor(9, 0);screen.print(".00");
          }else if(c>=10 && c<100){
            screen.setCursor(8, 0);screen.print(c);
            screen.setCursor(10, 0);screen.print(".00");
          }else if(c>=100){
            screen.setCursor(8, 0);screen.print(c);
            screen.setCursor(11, 0);screen.print(".00");
          }
        digitalWrite(gold, 1);
          delay(400);
      }else{
        Serial.println("COIN THREAT!");
        digitalWrite(buzz, 1);
        digitalWrite(gold, 1);
      }
      digitalWrite(pulse, 0);
        delayMicroseconds(2);
      digitalWrite(pulse, 1);
        delayMicroseconds(10);
      digitalWrite(pulse, 0);

      time=pulseIn(bounce, 1); 
      distance=(time*0.034)/2;

      delay(dt);
      digitalWrite(gold, 0);
      digitalWrite(buzz, 0);
    }
  delay(dt);
}

void welcome(){
  screen.setCursor(0, 0);screen.print(benvenue);
  screen.setCursor(0, 1);screen.print(benvenue_2);
    delay(350);
  for(int i=0; i<5; i++){
      screen.scrollDisplayLeft();
        delay(300);
  } 
  for(int i=0; i<5; i++){
       screen.scrollDisplayRight();
        delay(300);
  }
}