#define BLYNK_TEMPLATE_ID "TMPL33-ygH834"
#define BLYNK_TEMPLATE_NAME "Smart Traffic"
#define BLYNK_AUTH_TOKEN "lhSWhde6isKGh-AvG99raRkwg7VEhm9D"

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

char ssid[] = "Wokwi-GUEST";  // WiFi SSID
char pass[] = "";  // WiFi password

#define RED_LED_PIN 12  // Pin for red LED
#define YELLOW_LED_PIN 14  // Pin for yellow LED
#define GREEN_LED_PIN 27  // Pin for green LED
#define BUZZER_PIN 23  // Pin for buzzer
#define TRIGGER_PIN 32  // Pin for ultrasonic sensor trigger
#define ECHO_PIN 33  // Pin for ultrasonic sensor echo
#define POTENTIOMETER_PIN 34  // Pin for potentiometer
#define MAX_DISTANCE 400  // Maximum distance for ultrasonic sensor

NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE);  // Ultrasonic sensor object
BlynkTimer timer;  // Timer object for periodic tasks

void setup() 
{
  Serial.begin(9600);  // Initialize serial communication
  Serial.println("Starting setup...");
  
  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);  // Initialize Blynk with authentication token and WiFi credentials
  Serial.println("Blynk started...");
  
  pinMode(RED_LED_PIN, OUTPUT);  // Set red LED pin as output
  pinMode(YELLOW_LED_PIN, OUTPUT);  // Set yellow LED pin as output
  pinMode(GREEN_LED_PIN, OUTPUT);  // Set green LED pin as output
  pinMode(BUZZER_PIN, OUTPUT);  // Set buzzer pin as output
  pinMode(TRIGGER_PIN, OUTPUT);  // Set ultrasonic sensor trigger pin as output
  pinMode(ECHO_PIN, INPUT);  // Set ultrasonic sensor echo pin as input
  ledcSetup(0, 1000, 8); 
  timer.setInterval(1000L,sendSensorData);
  Serial.println("Setup complete...");
}
void loop() 
{
  Blynk.run();  // Run Blynk communication
  timer.run();  // Run timer tasks
}

void sendSensorData() 
{
  Blynk.run(); // Run Blynk communication
  int distance = sonar.ping_cm(); // Read distance from ultrasonic sensor
  int potValue = analogRead(POTENTIOMETER_PIN); // Read potentiometer value
  
  Serial.print("Distance: ");
  Serial.println(distance);
  Serial.print("Potentiometer: ");
  Serial.println(potValue);
  Blynk.virtualWrite(V4, distance);

  if (distance < 20 || potValue > 800) 
  {
      // Heavy traffic condition
    digitalWrite(RED_LED_PIN, HIGH);  // Turn on red LED
    delay(50); 
    digitalWrite(RED_LED_PIN, LOW);  // Turn off red LED
    delay(50);
    Blynk.virtualWrite(V1, HIGH);  // Turn on LED widget in Blynk app for red LED
    Blynk.virtualWrite(V2, LOW);  // Turn off LED widget in Blynk app for yellow LED
    Blynk.virtualWrite(V3, LOW);  // Turn off LED widget in Blynk app for green LED
    tone(BUZZER_PIN, 1000);  // Activate buzzer
    Serial.println("Heavy traffic");
  } 
  else if (distance < 50 || potValue > 600) 
  {
     // Moderate traffic condition
    digitalWrite(YELLOW_LED_PIN, HIGH);  // Turn on yellow LED
    delay(50); 
    digitalWrite(YELLOW_LED_PIN, LOW);  // Turn off yellow LED
    delay(50); 
    Blynk.virtualWrite(V1, LOW);  // Turn off LED widget in Blynk app for red LED
    Blynk.virtualWrite(V2, HIGH);  // Turn on LED widget in Blynk app for yellow LED
    Blynk.virtualWrite(V3, LOW);  // Turn off LED widget in Blynk app for green LED
    noTone(BUZZER_PIN);  // Deactivate buzzer
    Serial.println("Moderate traffic");
  } 
  else 
  {
    // Low traffic condition
    digitalWrite(GREEN_LED_PIN, HIGH);  // Turn on green LED
    delay(50); 
    digitalWrite(GREEN_LED_PIN, LOW);  // Turn off green LED
    delay(50); 
    Blynk.virtualWrite(V1, LOW);  // Turn off LED widget in Blynk app for red LED
    Blynk.virtualWrite(V2, LOW);  // Turn off LED widget in Blynk app for yellow LED
    Blynk.virtualWrite(V3, HIGH);  // Turn on LED widget in Blynk app for green LED
    noTone(BUZZER_PIN);
    Serial.println("Low traffic");
  }
    delay(100);
}