#define BLYNK_TEMPLATE_ID "TMPL3WLXcTL2U"
#define BLYNK_TEMPLATE_NAME "Project 10"
#define BLYNK_AUTH_TOKEN "Ykb098OCkTPAHqduki_LT-LQpH7jZd9QF"

#include <ESP32Servo.h>
#include <HX711.h>
#include <WiFi.h>
#include <BlynkSimpleEsp32.h>


const char* ssid = "Wokwi-GUEST";         
const char* password = "";               

const int trigPin = 12;
const int echoPin = 14;
const int servoPin = 16;
const int loadCellDout = 19;
const int loadCellSck = 18;

HX711 scale;
Servo servoMotor;

long duration;
float distanceCm;
float weightGrams;
float requiredWeight = 1000.0;
bool lidOpen = false;
BlynkTimer timer;

void setup() {
  Serial.begin(115200);
  
  
  Serial.println("Connecting to Wi-Fi...");
  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, password);
  
  if (WiFi.status() == WL_CONNECTED) {
    Serial.println("Connected to Wi-Fi.");
  } else {
    Serial.println("Failed to connect to Wi-Fi. Check credentials.");
  }

  
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);

 
  scale.begin(loadCellDout, loadCellSck);
  scale.set_scale(0.42);  

 
  servoMotor.attach(servoPin);
  servoMotor.write(0);    

  
  timer.setInterval(1000L, sendSensorData);

  Serial.println("System Initialized");
}


void openLid() {
  Serial.println("Opening the lid...");
  servoMotor.write(90);  
  lidOpen = true;        
  Blynk.virtualWrite(V3, "Open"); 
  distanceCm = 100;
  weightGrams = 1500;
 


}


void closeLid() {
  Serial.println("Closing the lid...");
  servoMotor.write(0);   
  lidOpen = false;       
  Blynk.virtualWrite(V3, "Closed"); 
  distanceCm = 155;
delay(5000);
}


void loop() {
  
  if (WiFi.status() != WL_CONNECTED) {
    Serial.println("Wi-Fi disconnected. Attempting reconnection...");
    WiFi.begin(ssid, password);
    while (WiFi.status() != WL_CONNECTED) {
      delay(500);
      Serial.print(".");
    }
    Serial.println("\nReconnected to Wi-Fi");
  }

  Blynk.run();       
  timer.run();       

  
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distanceCm = duration * 0.034 / 2;

  
  weightGrams = scale.get_units(10);

  
  if (distanceCm <= 150 && weightGrams >= requiredWeight) {
    Serial.println("Pet is present, food available. Opening the lid...");
    servoMotor.write(90);  }
    else{
    Serial.println("Conditions not met. Closing the lid.");
    servoMotor.write(0);   
  }

  
  Serial.print("Distance: ");
  Serial.print(distanceCm);
  Serial.print(" cm, Weight: ");
  Serial.print(weightGrams);
  Serial.println(" grams");

  delay(1000);
}


void sendSensorData() {
  Serial.print("Sending distance to Blynk: ");
  Serial.println(distanceCm);
  Blynk.virtualWrite(V2, distanceCm);    
  
  Serial.print("Sending weight to Blynk: ");
  Serial.println(weightGrams);
  Blynk.virtualWrite(V1, weightGrams);   

  int servoPos = servoMotor.read();
  String lidStatus;
  
  if (servoPos >= 85 && servoPos <= 95) { 
    lidStatus = "Open";
  } else if (servoPos >= -5 && servoPos <= 5) { 
    lidStatus = "Closed";
  } else {
    lidStatus = "Unknown"; 
  }

  Serial.print("Sending lid status to Blynk: ");
  Serial.println(lidStatus);
  Blynk.virtualWrite(V3, lidStatus); 
}
BLYNK_WRITE(V4) { 
  if (param.asInt() == 1) { 
    openLid();  
  } else {
    closeLid(); 
  }
}