Vehicle Emission Monitoring System

#define BLYNK_TEMPLATE_ID "TMPL3XzrSSZbz"
#define BLYNK_TEMPLATE_NAME "Vehicle Emission Monitoring System"
#define BLYNK_AUTH_TOKEN "o-JQekJHjb-Su4GFbt-kZOSu_GIiutFS"

#define BLYNK_PRINT Serial
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>

char auth[] = BLYNK_AUTH_TOKEN;
char ssid[] = "****";  // Enter your WiFi name
char pass[] = "********";   // Enter your WiFi password

int smoke = A0;        // Sensor for detecting gas (vehicle emission)
int redLed = D1;       // Red LED to indicate emission beyond threshold
int greenLed = D2;     // Green LED to indicate safe emission levels
int sensorThres = 360; // Threshold for emission detection
BlynkTimer timer;

void sendSensor() {
  int data = analogRead(smoke);
  Blynk.virtualWrite(V0, data);  // Send data to Blynk app
  Serial.print("Pin A0: ");
  Serial.println(data);

  if (data > sensorThres) {  // If the emission exceeds the threshold
    digitalWrite(redLed, HIGH);  // Turn on the red LED (unsafe emission)
    digitalWrite(greenLed, LOW); // Turn off the green LED
    Blynk.logEvent("emission_alert", "Vehicle Emission Exceeds Threshold");
  } else {  // If the emission is below the threshold
    digitalWrite(redLed, LOW);    // Turn off the red LED
    digitalWrite(greenLed, HIGH); // Turn on the green LED (safe emission)
  }
}

void setup() {
  pinMode(smoke, INPUT);      // Smoke sensor
  pinMode(redLed, OUTPUT);    // Red LED
  pinMode(greenLed, OUTPUT);  // Green LED
  digitalWrite(redLed, LOW);  // Ensure red LED is off at startup
  digitalWrite(greenLed, HIGH);// Ensure green LED is off at startup
  Serial.begin(115200);
  Blynk.begin(auth, ssid, pass);
  timer.setInterval(2500L, sendSensor);  // Check sensor every 2.5 seconds
}

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