Sense the flame.
Trigger response.

ESP8266 code

Replace the template values with your Blynk credentials, then connect your Wi-Fi details before uploading the code.

#define BLYNK_TEMPLATE_ID "Enter Your Template ID"
#define BLYNK_TEMPLATE_NAME "Enter Your Template Name"
#define BLYNK_AUTH_TOKEN "Enter Your Blynk Auth Token"
#define BLYNK_PRINT Serial

#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>

char ssid[] = "Your WiFi Name";
char pass[] = "Your WiFi Password";

#define FLAME_PIN D5
#define RELAY_PIN D1
#define ISD_PLAY  D2
#define LIGHT_PIN D6

bool fireNotified = false;
unsigned long lastBlinkTime = 0;
bool lightState = false;

void setup() {
  Serial.begin(9600);
  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);

  pinMode(FLAME_PIN, INPUT);
  pinMode(RELAY_PIN, OUTPUT);
  pinMode(ISD_PLAY, OUTPUT);
  pinMode(LIGHT_PIN, OUTPUT);

  digitalWrite(RELAY_PIN, LOW);
  digitalWrite(ISD_PLAY, LOW);
  digitalWrite(LIGHT_PIN, LOW);
}

void loop() {
  Blynk.run();

  int flameState = digitalRead(FLAME_PIN);
  unsigned long currentTime = millis();

  if (flameState == LOW) {
    digitalWrite(RELAY_PIN, HIGH);
    digitalWrite(ISD_PLAY, HIGH);

    if (currentTime - lastBlinkTime >= 250) {
      lastBlinkTime = currentTime;
      lightState = !lightState;
      digitalWrite(LIGHT_PIN, lightState);
    }

    if (!fireNotified) {
      Blynk.logEvent("fire_alert", "Fire Alert! Fire Detected!");
      fireNotified = true;
    }
  } else {
    digitalWrite(RELAY_PIN, LOW);
    digitalWrite(ISD_PLAY, LOW);
    digitalWrite(LIGHT_PIN, LOW);
    fireNotified = false;
  }
}