/***************************************************
 * IoT IV Bag Monitoring System (ESP32 + HX711 + Blynk IoT)
 * Components: HX711 (Load Cell), LCD I2C, Buzzer, Blynk IoT
 ***************************************************/

#define BLYNK_TEMPLATE_ID "TMPL3akDscKHν"
#define BLYNK_TEMPLATE_NAME "IoT IV Bag Monitor"
#define BLYNK_AUTH_TOKEN "TWGeFHnXr0Rc30NvYUMD1hEk6xCw-Wa"

#define BLYNK_PRINT Serial

#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>
#include <LiquidCrystal_I2C.h>
#include "HX711.h"

// LCD Configuration (Change 0x27 if needed)
LiquidCrystal_I2C lcd(0x27, 20, 4);

// HX711 Pins
#define DOUT  23
#define CLK   19
HX711 scale; // ✅ Corrected: Use default constructor

// Buzzer
#define BUZZER 25

// WiFi credentials
char ssid[] = "SUBASH";
char pass[] = "subash@1234";

// Measurement variables
float calibration_factor = 102500; // Adjust based on your load cell
float weight = 0.0;
int volume_ml = 0;
int percentage = 0;

void setup() {
  Serial.begin(115200);
  lcd.init();
  lcd.backlight();
  pinMode(BUZZER, OUTPUT);

  // Connect to Blynk
  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);

  // Initialize HX711
  Serial.println("Initializing HX711...");
  scale.begin(DOUT, CLK); // ✅ Correct place to set pins
  scale.set_scale(calibration_factor);
  scale.tare(); // Reset scale to zero
  Serial.println("Scale tared. Ready to measure.");
}

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

void measureIVBag() {
  weight = scale.get_units(5); // Average of 5 readings

  if (weight < 0) weight = 0.0;

  volume_ml = weight * 1000;              // Convert kg to mL (1kg = 1000mL)
  percentage = map(volume_ml, 0, 500, 0, 100); // Assuming 500mL IV bag
  if (percentage > 100) percentage = 100;

  // Display on LCD
  lcd.clear();
  lcd.setCursor(1, 0);
  lcd.print("IoT IV Bag Monitor");
  lcd.setCursor(2, 1);
  lcd.print("Monitoring System");

  lcd.setCursor(1, 2);
  lcd.print("Volume: ");
  lcd.print(volume_ml);
  lcd.print(" mL");

  lcd.setCursor(1, 3);
  lcd.print("Filled: ");
  lcd.print(percentage);
  lcd.print("%");

  // Send to Serial Monitor
  Serial.print("Weight: ");
  Serial.print(weight);
  Serial.println(" kg");

  Serial.print("Volume: ");
  Serial.print(volume_ml);
  Serial.println(" mL");

  Serial.print("Filled: ");
  Serial.print(percentage);
  Serial.println(" %");

  // Send to Blynk App
  Blynk.virtualWrite(V0, volume_ml);
  Blynk.virtualWrite(V1, percentage);

  // Alert Logic
  if (percentage <= 50 && percentage > 20) {
    Blynk.logEvent("iv_alert", "IV Bottle is at 50%");
    beepBuzzer(2);
  } else if (percentage <= 20) {
    Blynk.logEvent("iv_alert", "IV Bottle is too LOW!");
    digitalWrite(BUZZER, HIGH);
  } else {
    digitalWrite(BUZZER, LOW);
  }

  delay(1000); // 1-second interval
}

void beepBuzzer(int times) {
  for (int i = 0; i < times; i++) {
    digitalWrite(BUZZER, HIGH);
    delay(100);
    digitalWrite(BUZZER, LOW);
    delay(100);
  }
}