#include <Servo.h>                                 // include all library
#include <LiquidCrystal.h>
#include "HX711.h"
#define calibration_factor 7050.0                  //defined symbolic constant with a value of 7050.0.

const int rs = 13, en = 11, d4 = 10, d5 = 9, d6 = 8, d7 = 7;    //declare for LCD pins
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

//declare pins used in arduino
const int LOADCELL_DOUT_PIN = 14;
const int LOADCELL_SCK_PIN = 15;
float val = 0;
const int ledPin = 6;
const int trigPin = 2;
const int echoPin = 5;
const int servoPin = 3;
const int button = 4;
int status = false;
int buttonState; 
Servo servo;                                        //declare servo name
HX711 scale;                                        //Declare HX711 scale to connect to the load sensor

// Declare every variable's input and output in this setup
void setup() {                             
  pinMode(trigPin, OUTPUT);                           
  pinMode(echoPin, INPUT);
  pinMode(ledPin, OUTPUT);
  pinMode(button, INPUT_PULLUP);
  servo.attach(servoPin);
  scale.begin(LOADCELL_DOUT_PIN, LOADCELL_SCK_PIN);     //load sensor begin to intialize its function
  scale.set_scale(calibration_factor);                  //Calibrate the load sensor
  scale.tare();                                         //Present values of scale read from the load sensor
  lcd.begin(16,2);                                      //initialize LCD
  lcd.print("Hello Master!");                           //LCD display 
  lcd.setCursor(0, 1);                                  //set LCD position 
  lcd.print("food: ");
  lcd.print(val);                                       //get value      
  lcd.print("lbs");
  Serial.begin(9600);                                   //Serial monitor initialize

  Serial.println("Readings:");                         
}


void loop() {

  // Measure the distance using the ultrasonic sensor
  long duration, distance;
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = duration * 0.034 / 2;
 
  // Check if the distance is within the feeding range
  if (distance <= 10) {

    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("Feeding cat . . .");
    lcd.setCursor(0,1);
   
    // Call the function to dispense food
    dispenseFood();
  }

  else {
    servo.write(0);                       // servo off
    delay(1000);
    lcd.clear(); 
    lcd.print("Hello Master!");
    lcd.setCursor(0, 1);  
    lcd.print("food: ");
    lcd.print(val);      
    lcd.print("lbs");
    digitalWrite(ledPin, LOW);
  }

  buttonState = digitalRead(button);      // set button to feed the cat using button
  if(buttonState == LOW)
  {
    lcd.clear(); 
    lcd.setCursor(0,0);
    lcd.print("Feeding cat . . .");
    lcd.setCursor(0,1);
    
    // Call the function to dispense food
    dispenseFood();

  }

  else {
    servo.write(0);                       // servo off
    delay(1000);
    lcd.clear();                          // Clear LCD
    lcd.print("Hello Master!");
    lcd.setCursor(0, 1);                  // set LCD position
    lcd.print("food: ");
    lcd.print(val);                       // value of load 
    lcd.print("lbs");
    digitalWrite(ledPin, LOW);
  }

Serial.print("Reading: ");
  
  val=scale.get_units();                  // set variable for load sensor to get units from scale
  Serial.print(val);
  Serial.print(" lbs");
  Serial.println();

  if (val < 0.1)                          // set if value of load sensor below 0.1, led blinking
  {
    ledblinking();
  }
  else
{
   digitalWrite(ledPin, LOW);
}

}
 
void dispenseFood() {         // set function to dispense food
                              // Rotate the servo to dispense the food
  servo.write(180);
  delay(1000);
  
}

void ledblinking () {         //set function for ledblinking function

digitalWrite(ledPin, HIGH);
delay(1000);
digitalWrite(ledPin, LOW);
delay(1000);
}