#define BLYNK_PRINT Serial
#define BLYNK_TEMPLATE_ID "TMPL3vAr2BT0T"
#define BLYNK_TEMPLATE_NAME "Practical 10 Blynk App"
#define BLYNK_AUTH_TOKEN "mq8GQ8DSk_ueSGnHTSJgnwB4eVKl5XP4"
#include <ESP32Servo.h>
#include <HX711.h>
#include <WiFi.h>
#include <BlynkSimpleEsp32.h>


#define TRIG_PIN 5    
#define ECHO_PIN 18        
#define SERVO_PIN 0      
#define DOUT 16           
#define SCK 4              

Servo servoMotor;
HX711 scale;


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

const float REQUIRED_WEIGHT = 1.0;
const int DISTANCE_THRESHOLD = 150;

void setup() {
  Serial.begin(115200);
  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, password);

  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);

  servoMotor.attach(SERVO_PIN, 500, 2400); 
  servoMotor.write(0);

  scale.begin(DOUT, SCK);
  scale.set_scale(2280.f); 
  scale.tare();

  Serial.println("Pet Feeder Initialized");
}

void loop() {
  Blynk.run();

  float distance = getDistance();
  float foodWeight = scale.read() * 50 / 21000;

  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.print(" cm, Weight: ");
  Serial.print(foodWeight);
  Serial.println(" kg");

  bool foodAvailable = (foodWeight >= REQUIRED_WEIGHT);

  if (distance <= DISTANCE_THRESHOLD && foodAvailable) {
    Serial.println("Conditions met. Opening lid.");
    servoMotor.write(90); 
    delay(5000);
    servoMotor.write(0);  
  } else {
    Serial.println("Conditions not met. Lid remains closed.");
    servoMotor.write(0);
  }

  Blynk.virtualWrite(V0, distance);  
  Blynk.virtualWrite(V1, foodWeight); 

  delay(1000);
}

float getDistance() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  float duration = pulseIn(ECHO_PIN, HIGH);
  float distance = (duration * 0.0343) / 2;

  return distance;
}