#define BLYNK_TEMPLATE_ID "TMPL6gu43SB9Q"
#define BLYNK_TEMPLATE_NAME "Sensor HX711 dan PIR"
#define BLYNK_AUTH_TOKEN "nR1mq5i5mxHO57Bd6ieAS1qDGiPYXHLg"

#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"; // Replace with your Wi-Fi SSID
const char* password = ""; // Replace with your Wi-Fi password
char auth[] = "nR1mq5i5mxHO57Bd6ieAS1qDGiPYXHLg"; // Blynk Auth Token

const int PIR_PIN = 18;        // PIR Motion Sensor pin
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;
float calibration_factor = 420; // Adjust based on calibration

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

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

  pinMode(PIR_PIN, INPUT);    // Set PIR sensor pin as input
  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(calibration_factor);  // Set calibration factor
  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

  // Read PIR sensor to detect motion
  bool motionDetected = digitalRead(PIR_PIN) == HIGH;

  // Read Load Cell weight
  float weight = scale.get_units(10);  // Average of 10 readings

  // Display PIR and Load Cell data on LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("PIR: ");
  lcd.print(motionDetected ? "Motion" : "No Motion");

  lcd.setCursor(0, 1);
  lcd.print("Weight: ");
  lcd.print(weight, 2);  // Display weight with 2 decimal places

  // Send PIR and weight data to Blynk
  Blynk.virtualWrite(V1, motionDetected ? "Motion" : "No Motion");  // V1 for PIR status
  Blynk.virtualWrite(V2, weight);  // V2 for Load Cell weight

  // Serial monitor output
  Serial.print("PIR: ");
  Serial.println(motionDetected ? "Motion" : "No Motion");

  Serial.print("Weight: ");
  Serial.println(weight, 2);  // Display weight with 2 decimal places

  // If motion is detected
  if (motionDetected) {
    lcd.setCursor(0, 1);
    lcd.print("Motion Detected");
    Serial.println("Motion Detected");
    blinkLEDAndBuzzer();
  }
  // If weight exceeds 3kg
  else if (weight >= 3.0) {
    lcd.setCursor(0, 1);
    lcd.print("Weight >= 3kg");
    Serial.println("Weight >= 3kg");
    blinkLEDAndBuzzer();
  } else {
    // Turn off LED and Buzzer if no action
    digitalWrite(LED_PIN, LOW);
    noTone(BUZZER_PIN);
  }

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