// Include necessary libraries
#include <DHT.h>           // DHT library for temperature and humidity sensor
#include <NewPing.h>        // Ultrasonic sensor library
#include "HX711.h"          // Load cell library

// Pin definitions
#define DHTPIN 8            // DHT22 signal pin connected to pin 8
#define DHTTYPE DHT22       // Define the DHT sensor type (DHT22)

// Define pins for HX711 load cell amplifier
#define LOADCELL_DOUT_PIN 3 // Load cell DT pin connected to pin 3
#define LOADCELL_SCK_PIN 2  // Load cell SCK pin connected to pin 2

// Define pins for the ultrasonic sensor
#define TRIG_PIN 9          // Ultrasonic sensor TRIG pin connected to pin 9
#define ECHO_PIN 10         // Ultrasonic sensor ECHO pin connected to pin 10
#define MAX_DISTANCE 200    // Maximum distance to measure in cm

// Initialize sensor objects
DHT dht(DHTPIN, DHTTYPE);          // DHT22 sensor object
HX711 scale;                       // Load cell object
NewPing sonar(TRIG_PIN, ECHO_PIN, MAX_DISTANCE);  // Ultrasonic sensor object

void setup() {
  // Initialize serial communication
  Serial.begin(9600);
  
  // Initialize DHT sensor
  dht.begin();
  
  // Initialize load cell
  scale.begin(LOADCELL_DOUT_PIN, LOADCELL_SCK_PIN);
  scale.set_scale();              // Adjust to your load cell scale factor
  scale.tare();                   // Reset scale to zero
  
  // Display startup message
  Serial.println("EcoBin System Initialized!");
}

void loop() {
  // Read ultrasonic sensor for waste level (distance)
  int distance = sonar.ping_cm();
  Serial.print("Waste level distance: ");
  Serial.print(distance);
  Serial.println(" cm");

  // Read load cell for bin weight
  float weight = scale.get_units(5);  // Average of 5 readings
  Serial.print("Bin weight: ");
  Serial.print(weight);
  Serial.println(" kg");

  // Read temperature and humidity from DHT22
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();
  
  if (isnan(temperature) || isnan(humidity)) {
    Serial.println("Failed to read from DHT sensor!");
  } else {
    Serial.print("Temperature: ");
    Serial.print(temperature);
    Serial.println(" *C");
    
    Serial.print("Humidity: ");
    Serial.print(humidity);
    Serial.println(" %");
  }
  
  // Add a delay between each reading
  delay(5000); // Delay 5 seconds before the next reading
}