#include "HX711.h" // HX711 circuit wiring
#include <Wire.h> // Date and time functions using a DS1307 RTC connected via I2C and Wire lib
#include "RTClib.h"

DS1307 rtc; //initialize Real Time Clock (RTC) object
HX711 scale1; //initialize the first Load Cell object
HX711 scale2; //initialize the second Load Cell object

char daysOfTheWeek[7][12] = {"Sunday", "Monday", "Tuesday",
 "Wednesday", "Thursday", "Friday", "Saturday"};

long bridge_capacity = 10; //KG
const int Green = 7;
const int Red = 6;
int Vehicle_Counter = 0;
long total = 0;

const int LOADCELL_DOUT_PIN1 = 2; //for sensor 1
const int LOADCELL_SCK_PIN1 = 3; //for sensor 1

const int LOADCELL_DOUT_PIN2 = 4; //for sensor 2
const int LOADCELL_SCK_PIN2 = 5; //for sensor 2


void setup() {
  // put your setup code here, to run once:
  Serial.begin(57600);

  /////////////
if (! rtc.begin()) {
   Serial.println("Couldn't find RTC");
   while (1);
 }
 if (! rtc.isrunning()) {
   Serial.println("RTC is NOT running!");
   // following line sets the RTC to the date & time this sketch was compiled
   rtc.adjust(DateTime(F(__DATE__), F(__TIME__))); // This line sets the RTC with an explicit date & time
 }
//////////////

  pinMode(Green, OUTPUT);
  pinMode(Red, OUTPUT);

  scale1.begin(LOADCELL_DOUT_PIN1, LOADCELL_SCK_PIN1);
  scale2.begin(LOADCELL_DOUT_PIN2, LOADCELL_SCK_PIN2);
  scale1.tare();  // reset the weight to zero
  scale2.tare();   // reset the weight to zero
  digitalWrite(Green, HIGH);  
}




void loop() {
  // put your main code here, to run repeatedly:
 
  if (scale1.is_ready() | scale2.is_ready()) {
    long reading1 = (scale1.read_average(20)/420); //read the average of 20 readings of weight from scale 1 in KGs
    long reading2 = (scale2.read_average(20)/420); //read the average of 20 readings of weight from scale 2 in KGs
    Serial.print("Weight on Scale 1 in KGs is: ");
    Serial.println(reading1);
    if(reading2 > 0){
      Vehicle_Counter= Vehicle_Counter+1; //if a vehicle crosses the bridge, the counter will increase
    }
    Serial.print("Weight on Scale 2 in KGs is: ");   
    Serial.println(reading2);
    Serial.print("Number of vehicles that crossed the bridge is: ");
    Serial.println(Vehicle_Counter); 
  
    total = total + (reading1);
    scale1.tare();
    total = total - (reading2);
    scale2.tare();
    if (total < 0){ //to prevent negative weight 
      total = 0;}
    Serial.print("Total Weight is: ");   
    Serial.println(total); //print the total weight
    DateTime now = rtc.now();
    Serial.print("The date and time is: ");
    int year = now.year();
    int month = now.month();
    int day = now.day();
    int hour = now.hour();
    int minute = now.minute();
    Serial.print(year, DEC);
    Serial.print('/');
    Serial.print(month, DEC);
    Serial.print('/');
    Serial.print(day, DEC);
    Serial.print(" (");
    Serial.print(daysOfTheWeek[now.dayOfWeek()]);
    Serial.print(") ");
    Serial.print(hour, DEC);
    Serial.print(':');
    Serial.print(minute, DEC);
    Serial.print(':');
    Serial.print('/');


FILE* fp = fopen("file_path", "a+");

    
    if (!fp) {
        // Error in file opening
        printf("Can't open file\n");
        return 0;
    }
    
    // Saving data in file
    fprintf(fp, "%d , %d, %d,%d,d%,d% \n", year,
            month, day,hour,minute);
 
    printf("\nNew Account added to record");
 
    fclose(fp);
   
  
  if(total >= (bridge_capacity-5)){
      digitalWrite(Green, LOW);
      //delay(5000);
      digitalWrite(Red, HIGH);
      
    }
  else{
    digitalWrite(Red, LOW);
    //delay(5000);
    digitalWrite(Green, HIGH);

  }
  } 
  
  
  else {
    Serial.println("Weight sensor not found.");
  }



  delay(1000);
}