void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
}

void loop() {
  // put your main code here, to run repeatedly:
  delay(10); // this speeds up the simulation
}
#define BLYNK_PRINT Serial
#include <WiFi.h>
#include <BlynkSimpleEsp32.h>
#include <NewPing.h>

// Blynk auth token
char auth[] = "YourAuthToken";

// WiFi credentials
char ssid[] = "YourSSID";
char pass[] = "YourPassword";

// Ultrasonic Sensor Pins
#define TRIG_PIN1 18
#define ECHO_PIN1 19
#define TRIG_PIN2 21
#define ECHO_PIN2 22

// Traffic Light Pins
#define RED_LIGHT 15
#define GREEN_LIGHT 4
#define YELLOW_LIGHT 2

NewPing sonar1(TRIG_PIN1, ECHO_PIN1, 200);
NewPing sonar2(TRIG_PIN2, ECHO_PIN2, 200);

void setup() {
  Serial.begin(115200);
  Blynk.begin(auth, ssid, pass);

  pinMode(RED_LIGHT, OUTPUT);
  pinMode(GREEN_LIGHT, OUTPUT);
  pinMode(YELLOW_LIGHT, OUTPUT);
}

void loop() {
  Blynk.run();

  // Measure distance from sensors
  int distance1 = sonar1.ping_cm();
  int distance2 = sonar2.ping_cm();

  // Logic to control traffic lights based on traffic density
  if (distance1 < 50 || distance2 < 50) {
    // High traffic density
    digitalWrite(RED_LIGHT, HIGH);
    digitalWrite(GREEN_LIGHT, LOW);
    digitalWrite(YELLOW_LIGHT, LOW);
  } else if ((distance1 >= 50 && distance1 < 100) || (distance2 >= 50 && distance2 < 100)) {
    // Medium traffic density
    digitalWrite(RED_LIGHT, LOW);
    digitalWrite(GREEN_LIGHT, LOW);
    digitalWrite(YELLOW_LIGHT, HIGH);
  } else {
    // Low traffic density
    digitalWrite(RED_LIGHT, LOW);
    digitalWrite(GREEN_LIGHT, HIGH);
    digitalWrite(YELLOW_LIGHT, LOW);
  }

  // Send traffic data to Blynk app
  Blynk.virtualWrite(V1, distance1);
  Blynk.virtualWrite(V2, distance2);

  delay(1000); // Delay between readings
}