#define BLYNK_PRINT Serial
#define BLYNK_TEMPLATE_ID "TMPL34gXCPWvE"
#define BLYNK_TEMPLATE_NAME "practical 10 blynk"
#define BLYNK_AUTH_TOKEN "CrDuzQsRlCePYSyM49M7ES45Ef7_H2uS"

#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>
#include "HX711.h"
#include <ESP32Servo.h>
char auth[] = BLYNK_AUTH_TOKEN;
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

BlynkTimer timer;

#define BUTTON_VPIN V0
#define WEIGHT_VPIN V1
#define DISTANCE_VPIN V2

#define DT 16
#define SCK 4
HX711 scale;

const int SensorTRG = 25;
const int SensorECH = 26;

const int servoPin = 19;
Servo myServo;

BLYNK_WRITE(BUTTON_VPIN) {
  int buttonState = param.asInt();  
  Serial.print("Button state from Blynk: ");
  Serial.println(buttonState);

  double weight = weightRead();
  long distance = readDistance();

  Blynk.virtualWrite(WEIGHT_VPIN, weight);
  Blynk.virtualWrite(DISTANCE_VPIN, distance);

  if (buttonState == 1) { 
    if (weight > 1) {
      containerOpen();
      Serial.println("Container Opened");
    } else {
      Serial.println("Container Empty");
    }
  } else { 
    containerClose();
    Serial.println("Container Closed");
  }
}

long readDistance() {
  digitalWrite(SensorTRG, LOW);
  delayMicroseconds(2);
  digitalWrite(SensorTRG, HIGH);
  delayMicroseconds(10);
  digitalWrite(SensorTRG, LOW);

  long duration = pulseIn(SensorECH, HIGH);
  long distance = duration * 0.034 / 2;  

  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");
  
  return distance;
}

void containerOpen() {
  Serial.println("Dispensing FOOD..!!");
  myServo.write(0);  
}

void containerClose() {
  myServo.write(90); 
  Serial.println("Food dispensed...!!");
}

float weightRead() {
  Serial.println("Pet Nearby..!!");
  if (scale.is_ready()) {
    Serial.println("Reading Weight..");
    float weight = scale.get_units();
    weight *= 2.381; 
    float kilograms = weight / 1000;

    Serial.print("Weight: ");
    Serial.print(kilograms);
    Serial.println(" kg");
    return kilograms;
  } else {
    Serial.println("Error In Reading weight value");
    return 0;
  }
}

void setup() {
  Serial.begin(115200);
  
  Blynk.begin(auth, ssid, pass);
  Serial.println("Connecting to Blynk...");

  scale.begin(DT, SCK);
  
  myServo.attach(servoPin, 500, 2400); 
  myServo.write(90); 
  
  pinMode(SensorTRG, OUTPUT);
  pinMode(SensorECH, INPUT);
}

void loop() {
  Blynk.run();  
}