#define BLYNK_TEMPLATE_ID "TMPL3Km-KhYaI"
#define BLYNK_TEMPLATE_NAME "smart traffic diversion system for road congestion"
#define BLYNK_AUTH_TOKEN "YZsaZAV4G77kszvVrBLYRTz3AosqFdAh"

#define BLYNK_TEMPLATE_ID "TMPL3Km-KhYaI"
#define BLYNK_TEMPLATE_NAME "smart traffic diversion system for road congestion"

#include <WiFi.h>
#include <HTTPClient.h>
#include <Blynk.h>

const char* ssid = "Wokwi-GUEST"; // Wokwi provides a default SSID for simulations
const char* password = "";

const int trigPin = 5;
const int echoPin = 18;
const int redLED = 23;
const int yellowLED = 22;
const int greenLED = 21;
long duration;
int distance;

void setup() {
  Serial.begin(115200);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(redLED, OUTPUT);
  pinMode(yellowLED, OUTPUT);
  pinMode(greenLED, OUTPUT);

  // Connect to Wi-Fi
  WiFi.begin(ssid, password);
  Serial.print("Connecting to WiFi ..");
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.print('.');
  }
  Serial.println("\nConnected to WiFi");
}

void sendTrafficData(int distance) {
  if (WiFi.status() == WL_CONNECTED) {
    HTTPClient http;
    http.begin("https://eovuqitnlsdyxir.m.pipedream.net"); // Replace with your Pipedream RequestBin URL
    http.addHeader("Content-Type", "application/json");

    String postData = "{\"distance\":" + String(distance) + "}";
    int httpResponseCode = http.POST(postData);

    if (httpResponseCode > 0) {
      String response = http.getString();
      Serial.println(httpResponseCode);
      Serial.println(response);
    } else {
      Serial.print("Error on sending POST: ");
      Serial.println(httpResponseCode);
    }

    http.end();
  } else {
    Serial.println("WiFi Disconnected");
  }
}

void loop() {
  // Clear the trigPin by setting it LOW
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  // Set the trigPin HIGH for 10 microseconds
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  // Read the echoPin, returns the sound wave travel time in microseconds
  duration = pulseIn(echoPin, HIGH);

  // Calculate the distance
  distance = duration * 0.034 / 2;

  Serial.print("Distance: ");
  Serial.println(distance);

  // Traffic light logic based on distance
  if (distance < 100) {
    digitalWrite(redLED, HIGH);
    digitalWrite(yellowLED, LOW);
    digitalWrite(greenLED, LOW);
    Serial.println("Heavy Traffic Detected: Red Light ON");
  } else if (distance < 200) {
    digitalWrite(redLED, LOW);
    digitalWrite(yellowLED, HIGH);
    digitalWrite(greenLED, LOW);
    Serial.println("Moderate Traffic Detected: Yellow Light ON");
  } else {
    digitalWrite(redLED, LOW);
    digitalWrite(yellowLED, LOW);
    digitalWrite(greenLED, HIGH);
    Serial.println("Low Traffic Detected: Green Light ON");
  }

  sendTrafficData(distance);

  delay(10000);
}
{
  Blynk.run();
}
}