#define BLYNK_TEMPLATE_ID "TMPL3R2c0wG3m"
#define BLYNK_TEMPLATE_NAME "Smart Load Monitor"
#define BLYNK_AUTH_TOKEN "bbp0r33vgSdrYYaF77R9y79WauHLEdo1"

#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <WiFi.h>
#include <BlynkSimpleEsp32.h>  // Blynk library for ESP32
#include <HX711.h>  // HX711 load cell library

const char* ssid = "Wokwi-GUEST"; // Wi-Fi SSID
const char* password = ""; //  Wi-Fi password
char auth[] = "bbp0r33vgSdrYYaF77R9y79WauHLEdo1"; // Blynk Auth Token
String Message ="HI kavi: Overload Alert";
String Message1 ="HI kavi: Material Deplition Alert";

const int LED_PIN = 15;        // LED pin
const int BUZZER_PIN = 2;      // Buzzer pin

// Load Cell HX711 setup
const int LOADCELL_DOUT_PIN = 4;
const int LOADCELL_SCK_PIN = 5;
HX711 scale;

// Initialize LCD I2C with address 0x27 and size 16x2
LiquidCrystal_I2C lcd(0x27, 16, 2);

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

  pinMode(LED_PIN, OUTPUT);   // Set LED pin as output
  pinMode(BUZZER_PIN, OUTPUT); // Set Buzzer pin as output

  // Initialize LCD
  Wire.begin(21, 22);
  lcd.begin(16, 2);
  lcd.backlight();
  lcd.print("LCD OK!");
  delay(1000);

  // Setup Load Cell HX711
  scale.begin(LOADCELL_DOUT_PIN, LOADCELL_SCK_PIN);
  scale.set_scale(0.42);
  scale.tare();  // Set initial weight to 0

  // Connect to Wi-Fi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");

  // Connect to Blynk
  Blynk.begin(auth, ssid, password);
}

void blinkLEDAndBuzzer() {
  for (int i = 0; i < 3; i++) {
    digitalWrite(LED_PIN, HIGH);
    tone(BUZZER_PIN, 800);
    delay(300);
    
    digitalWrite(LED_PIN, LOW);
    noTone(BUZZER_PIN);
    delay(300);
  }
}

void loop() {
  Blynk.run();  // Keep Blynk connection alive

  
    long reading = scale.get_units(3);
    float kg = float(reading) / 1000;
    Serial.print("WEIGHT: ");
    Serial.print(kg, 2);
    Serial.println(" kg");

    lcd.setCursor(0,0);
    lcd.print("Smart load monitor");
    lcd.setCursor(0,1);
    lcd.print("WEIGHT: " + String(kg, 2) + "kg");
  
  
  // Send weight data to Blynk
  
  Blynk.virtualWrite(V1,kg);  // v1 for Load Cell weight
  
  // If weight exceeds 45kg
  if (kg >= 45.0) {
    lcd.setCursor(0, 1);
    lcd.print("overload");
    Serial.println("Overload");
    Blynk.logEvent("overload", Message);
    blinkLEDAndBuzzer();
  } 
  // if weight below 5 kg
  else if (kg <= 5.0) {
    lcd.setCursor(0, 1);
    lcd.print("Material Deplition");
    Serial.println("Material Deplition");
    Blynk.logEvent("deplition", Message1);
    blinkLEDAndBuzzer();
  } 

  else {
    // Turn off LED and Buzzer if no action
    digitalWrite(LED_PIN, LOW);
    noTone(BUZZER_PIN);
  }

  delay(200); // Wait before reading again
}