//libraries
#define BLYNK_TEMPLATE_ID "TMPL5iI062b8a" // Blynk Template ID
#define BLYNK_TEMPLATE_NAME "Smart Health Monitoring System" // Blynk Template Name
#include <DHT.h> // Library for the DHT sensor
#include <LiquidCrystal.h> // Library for the LCD
#include <WiFi.h> // Library for the WiFi
#include <BlynkSimpleEsp32.h> // Library for the Blynk

#define SPIN 32 // Define SPO2 pin
#define HPIN 35 // Define Heart Rate pin
int bloodPressureMonitor; // Variable for storing heart rate
int spo2; // Variable for storing SPO2

const int DHTPIN = 12; // Define DHT sensor pin
int PirPin = 33; // Define PIR sensor pin
int pirState = LOW; // PIR sensor state
int val = 0; // Variable for storing PIR sensor value

const int RS = 4, E = 15, DB4 = 5, DB5 = 18, DB6 = 21, DB7 = 22; // Configuration LCD pin 
LiquidCrystal lcd(RS, E, DB4, DB5, DB6, DB7); // Initialize LCD
int humidity; // Variable for storing humidity
float temperatureCelsius; // Variable for storing temperature in Celsius
float temperatureFahrenheit; // Variable for storing temperature in Fahrenheit
DHT dht(DHTPIN, DHT22); // Initialize DHT sensor
long lastTime = 0; // Taken last time measurement  
long timerDelay = 500; // Time delay
const char ssid[] = "Wokwi-GUEST"; // WiFi SSID
const char password[] = ""; // WiFi password
int motionState; // Variable for motion state

// Blynk code defines start
char auth[] = "3PIp32nmDl6WdiigyeKg_5Smw63dII0i"; // Replace with your Blynk Auth Token

void setup() {
  // Initialize Serial Monitor
  Serial.begin(115200);
  
  // Initialize LCD
  lcd.begin(16, 2);
  
  lcd.print("Health Monitoring");
  delay(500);
  lcd.scrollDisplayLeft();

  Serial.println("Hello, Have a nice day!");

  // Initialize PIR sensor
  pinMode(PirPin, INPUT);

  // Connect to the WiFi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print("-");
  }
  Serial.println("");
  Serial.print("ESP 32 Connected\n");
  Serial.println(WiFi.localIP());
  
  motionState = LOW;
  dht.begin();

  // Initialize Blynk
  Blynk.begin(auth, ssid, password);
  delay(2000);
}

void loop() {
  // Run Blynk
  Blynk.run();

  // Check timer
  if ((millis() - lastTime) > timerDelay) {
    if (WiFi.status() == WL_CONNECTED) {
      // Read PIR sensor
      val = digitalRead(PirPin);
      
      // Read humidity and temperature from DHT sensor
      humidity = dht.readHumidity();
      temperatureCelsius = dht.readTemperature();
      temperatureFahrenheit = (temperatureCelsius * 1.8) + 32;
      
      // Clear and update LCD display
      lcd.clear();
      display(temperatureFahrenheit, humidity, bloodPressureMonitor, spo2);
      
      // Get heart rate and SPO2
      getBloodPressureMonitor();
      getSpo2();

      // Check PIR sensor value
      if (val == HIGH) {
        if (pirState == LOW) {
          Serial.println("\nMotion detected!");
          motionState = HIGH;
          sendData(temperatureFahrenheit, humidity, bloodPressureMonitor, spo2, motionState);
          pirState = HIGH;
          lcd.setCursor(0, 1);
          lcd.print("Motion detected!");
          
          // Log event in Blynk
          Blynk.logEvent("health_monitor", "Motion detected!");
        }
      } else {
        if (pirState == HIGH) {
          delay(5000);
          Serial.println("\nMotion ended!");
          motionState = LOW;
          sendData(temperatureFahrenheit, humidity, bloodPressureMonitor, spo2, motionState);
          pirState = LOW;
          lcd.setCursor(0, 1);
          lcd.print("Motion ended!    ");
        }
      }
      
      // Send data to Blynk
      sendData(temperatureFahrenheit, humidity, bloodPressureMonitor, spo2, motionState);
    } else {
      Serial.println("WiFi Disconnected");
    }
    lastTime = millis();
  }
}

void getBloodPressureMonitor() {
  // Read analog value from heart rate sensor
  int signal2 = analogRead(HPIN);
  bloodPressureMonitor = map(signal2, 0, 4095, 0, 200);
}

void getSpo2() {
  // Read analog value from SPO2 sensor
  int signal3 = analogRead(SPIN);
  spo2 = map(signal3, 0, 4095, 0, 200);
}

void display(float temp, int humidity, int bloodPressureMonitor, int spo2) {
  // Print sensor values to Serial Monitor

  Serial.print("\nHumidity: ");
  Serial.print(humidity);
  Serial.print(" %");  // Adding percentage symbol for humidity

  Serial.print("\tTemperature: ");
  Serial.print(temp);
  Serial.print(" °F"); // Adding degree Fahrenheit symbol for temperature

  Serial.print("\nHeartRate: ");
  Serial.print(bloodPressureMonitor);
  Serial.print(" bpm"); // Adding beats per minute (bpm) for heart rate

  Serial.print("\tSpO2: ");
  Serial.print(spo2);
  Serial.print(" %"); // Adding percentage symbol for SpO2



  // Display sensor values on LCD
  lcd.setCursor(0, 0);
  lcd.print("Hum: ");
  lcd.print(humidity);
  lcd.print("\tTemp: ");
  lcd.print(temperatureFahrenheit);
  lcd.setCursor(0, 1);
  lcd.print("BPM: ");
  lcd.print(bloodPressureMonitor);
  lcd.print("\tSpO2: ");
  lcd.print(spo2);

  // Update Blynk virtual pins with sensor values
  Blynk.virtualWrite(V0, temp); // Body Temp Gauge
  Blynk.virtualWrite(V1, humidity); // Humidity Label
  Blynk.virtualWrite(V2, bloodPressureMonitor); // Heart Rate
  Blynk.virtualWrite(V3, spo2); // SpO2
}

void sendData(float temp, int humidity, int bloodPressureMonitor, int spo2, int motionState) {
  // Send sensor data to Blynk
  Blynk.virtualWrite(V0, temp); // Body Temp Gauge
  Blynk.virtualWrite(V1, humidity); // Humidity Label
  Blynk.virtualWrite(V2, bloodPressureMonitor); // Heart Rate
  Blynk.virtualWrite(V3, spo2); // SpO2
  Blynk.virtualWrite(V4, motionState); // Motion State
}