#define BLYNK_TEMPLATE_ID "TMPL3Lfo1Ev1l"
#define BLYNK_TEMPLATE_NAME "Smart Traffic Management Project1"
#define BLYNK_AUTH_TOKEN "r1ivzNJJpxmsQ4QWvI6ObjqIO6SFISI6"
#include <Blynk.h>
#include <WiFi.h>
#include <NewPing.h>
char auth[]="r1ivzNJJpxmsQ4QWvI6ObjqIO6SFISI6";
char ssid[]="Wokwi-GUEST";
char pass[]="";
#define RED_LED_PIN 12
#define YELLOW_LED_PIN 14
#define GREEN_LED_PIN 27
#define BUZZER_PIN 25
#define POTENTIOMETER_PIN 35
#define TRIGGER_PIN 32
#define ECHO_PIN 34
#define MAX_DISTANCE 200
NewPing sonar(ECHO_PIN,POTENTIOMETER_PIN,MAX_DISTANCE);
void setup() {
  Serial.begin(115200);
  Blynk.begin(auth,ssid,pass);
  pinMode(RED_LED_PIN, OUTPUT);
  pinMode(YELLOW_LED_PIN, OUTPUT);
  pinMode(GREEN_LED_PIN, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);
  pinMode(TRIGGER_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  ledcsetup(0,1000,8);
  ledcAttachPin(BUZZER_PIN,0)
}

void loop() {
  Blynk.run(); 
  int distance = sonar.ping_cm();
  int potValue = analogRead(POTENTIOMETER_PIN);
  if (distance < 20 || potValue > 800) 
  {
    Blynk.virtualWrite(V1, HIGH); 
    Blynk.virtualWrite(V2, LOW); 
    Blynk.virtualWrite(V3, LOW); 
    tone(BUZZER_PIN, 1000); 
  } 
  else if (distance < 50 || potValue > 600) 
  {
    Blynk.virtualWrite(V1, LOW); 
    Blynk.virtualWrite(V2, HIGH); 
    Blynk.virtualWrite(V3, LOW); 
    noTone(BUZZER_PIN); 
  } 
  else 
  {
    Blynk.virtualWrite(V1, LOW); 
    Blynk.virtualWrite(V2, LOW); 
    Blynk.virtualWrite(V3, HIGH); 
    noTone(BUZZER_PIN); 
  }
  Blynk.virtualWrite(V4, distance);
  delay(10); 
}