#define BLYNK_PRINT Serial
#define BLYNK_TEMPLATE_ID "TMPL3OmXli1Ql"
#define BLYNK_TEMPLATE_NAME "IoT Enable Machine Monitoring system"
#define BLYNK_AUTH_TOKEN "Re68YtpePJcWtbhAit4t7XAOIPr4g15R"

#include <WiFi.h>
#include <BlynkSimpleEsp32.h>
#include <DHT.h>

char ssid[] = "Wokwi-GUEST";
char pass[] = "";

#define DHTPIN 15
#define DHTTYPE DHT22
#define MQ2_PIN 34
#define LED_PIN 13
#define BUZZER_PIN 27

#define TEMP_HIGH 70
#define TEMP_LOW  60     
#define GAS_HIGH  2000
#define GAS_LOW   1200   

DHT dht(DHTPIN, DHTTYPE);
BlynkTimer timer;

bool alertState = false;   

void sendData() {
  float temp = dht.readTemperature();
  float hum  = dht.readHumidity();
  int gas    = analogRead(MQ2_PIN);

  Serial.print("Temp: ");
  Serial.print(temp);
  Serial.print(" °C | Hum: ");
  Serial.print(hum);
  Serial.print(" % | Gas: ");
  Serial.println(gas);

  Blynk.virtualWrite(V0, temp);
  Blynk.virtualWrite(V1, hum);
  Blynk.virtualWrite(V2, gas);

  if (!alertState && (temp > TEMP_HIGH || gas > GAS_HIGH)) {
    alertState = true;
    digitalWrite(LED_PIN, HIGH);
    digitalWrite(BUZZER_PIN, HIGH);
    Blynk.logEvent("safety_alert", "⚠ Machine Risk Detected");
    Serial.println("ALERT ON");
  }

  if (alertState && (temp < TEMP_LOW && gas < GAS_LOW)) {
    alertState = false;
    digitalWrite(LED_PIN, LOW);
    digitalWrite(BUZZER_PIN, LOW);
    Serial.println("ALERT OFF");
  }
}

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

  pinMode(LED_PIN, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);

  digitalWrite(LED_PIN, LOW);
  digitalWrite(BUZZER_PIN, LOW);

  dht.begin();
  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);

  timer.setInterval(2000L, sendData);
}

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