#define BLYNK_TEMPLATE_ID "TMPL3hlpgNA_N"
#define BLYNK_TEMPLATE_NAME "Traffic Monitoring System"
#define BLYNK_AUTH_TOKEN "7WxX4li19oGfNeWLSqIU6pWCrsckjY-n"

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

char auth[] = BLYNK_AUTH_TOKEN;
char ssid[] = "Wokwi-GUEST"; // Use the Wokwi Guest network
char pass[] = "";
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, pass);
  Serial.print("Connecting to WiFi ..");
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.print('.');
  }
  Serial.println("\nConnected to WiFi");
  Blynk.begin(auth, ssid, pass);
  
 
}

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("\nError on sending POST: ");
      Serial.println(httpResponseCode);
    }

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

void loop() {
  Blynk.run();
  
  // 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("\nDistance: ");
  Serial.print(distance);
  
  // Send the distance to the Blynk app
  
  
  // Traffic light logic based on distance
  if (distance < 100) {
    digitalWrite(redLED, HIGH);
    digitalWrite(yellowLED, LOW);
    digitalWrite(greenLED, LOW);
    Serial.print("\nHeavy Traffic Detected: Red Light ON");
  } else if (distance < 200) {
    digitalWrite(redLED, LOW);
    digitalWrite(yellowLED, HIGH);
    digitalWrite(greenLED, LOW);
    Serial.print("\nModerate Traffic Detected: Yellow Light ON");
  } else {
    digitalWrite(redLED, LOW);
    digitalWrite(yellowLED, LOW);
    digitalWrite(greenLED, HIGH);
    Serial.print("\nLow Traffic Detected: Green Light ON");
  }

  // Send traffic data to the server
  sendTrafficData(distance);
  Blynk.virtualWrite(V3, distance);

  delay(10000); // Send data every 10 seconds
}