#include <Arduino.h>
#include <HX711.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>

const int ld_cell = 2;
const int ld_sck = 4;
const int TRIG_PIN = 25;  // GPIO 25 for TRIG
const int ECHO_PIN = 26;  // GPIO 26 for ECHO
const int pirPin = 35;    // Pin connected to PIR sensor OUT
const int MAX_DISTANCE = 300; // Maximum distance threshold in cm
const float MAX_WEIGHT = 4.0;

bool motionDetected = false;

HX711 scale;
LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  Serial.begin(115200);
  Wire.begin();

  lcd.init();
  lcd.backlight();

  scale.begin(ld_cell, ld_sck);
  scale.set_scale();
 
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(pirPin, INPUT);
}

void loop() {
  long duration;
  int distance;

  int pirValue = digitalRead(pirPin);

  // Ultrasonic sensor measurements
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  duration = pulseIn(ECHO_PIN, HIGH);
  distance = duration * 0.034 / 2; // Calculate distance in cm
  
  float reading = scale.get_units(10); // Read the average of 10 readings

  if (pirValue == HIGH) {
    // PIR sensor detected motion
   
Serial.println(reading/419.8);
    // Check if weight exceeds maximum threshold
    if (reading/419.8 > MAX_WEIGHT) {
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Weight  Max");
      
      lcd.setCursor(0, 1);
      lcd.print("Distance : ");
      lcd.print(distance);
      lcd.print(" cm");
    }
   else if (distance > MAX_DISTANCE) {
    lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Weight : ");
      lcd.print(reading/419.8);
      lcd.print(" kg");
      
      lcd.setCursor(0, 1);
      lcd.print("Distance  Max");
      
    } else if(distance > MAX_DISTANCE && reading/419.8 > MAX_WEIGHT){
     lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Weight  Max");
      lcd.setCursor(0, 1);
      lcd.print("Distance  Max");

    }   
    // Check if distance exceeds maximum threshold
 
    
    // Display weight and distance only if neither threshold was exceeded
    else {
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Weight : ");
      lcd.print(reading/419.8);
      lcd.print(" kg");

      lcd.setCursor(0, 1);
      lcd.print("Distance : ");
      lcd.print(distance);
      lcd.print(" cm");
    }
  } else {
   
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("No motion detected");
    
  }
  
  delay(1000); // Adjust delay as needed
}