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

// Replace with your network credentials
const char* ssid = "your_SSID";
const char* password = "your_PASSWORD";

// Server URL
const char* serverName = "http://your-server.com/traffic-data";

// Ultrasonic Sensor Pins
const int trigPin = 5;
const int echoPin = 18;

// Variables for distance measurement
long duration;
int distance;

void setup() {
  // Initialize Serial Monitor
    Serial.begin(115200);

      // Initialize Ultrasonic Sensor Pins
        pinMode(trigPin, OUTPUT);
          pinMode(echoPin, INPUT);

            // Connect to Wi-Fi
              Serial.print("Connecting to ");
                Serial.println(ssid);
                  WiFi.begin(ssid, password);

                    while (WiFi.status() != WL_CONNECTED) {
                        delay(500);
                            Serial.print(".");
                              }

                                Serial.println("");
                                  Serial.println("WiFi connected.");
                                    Serial.println("IP address: ");
                                      Serial.println(WiFi.localIP());
                                      }

                                      void loop() {
                                        // Clear the trigPin by setting it LOW
                                          digitalWrite(trigPin, LOW);
                                            delayMicroseconds(2);

                                              // Trigger the sensor by setting 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;

                                                              // Print the distance on the Serial Monitor
                                                                Serial.print("Distance: ");
                                                                  Serial.print(distance);
                                                                    Serial.println(" cm");

                                                                      // If a vehicle is detected (distance < threshold)
                                                                        if (distance < 100) {
                                                                            sendTrafficData(distance);
                                                                              }

                                                                                delay(1000);
                                                                                }

                                                                                void sendTrafficData(int distance) {
                                                                                  if (WiFi.status() == WL_CONNECTED) {
                                                                                      HTTPClient http;

                                                                                          // Specify content-type header
                                                                                              http.begin(serverName);
                                                                                                  http.addHeader("Content-Type", "application/x-www-form-urlencoded");

                                                                                                      // Prepare data to be sent
                                                                                                          String httpRequestData = "distance=" + String(distance);

                                                                                                              // Send HTTP POST request
                                                                                                                  int httpResponseCode = http.POST(httpRequestData);

                                                                                                                      // If the response code is greater than 0, the request was successful
                                                                                                                          if (httpResponseCode > 0) {
                                                                                                                                String response = http.getString();
                                                                                                                                      Serial.println(httpResponseCode);
                                                                                                                                            Serial.println(response);
                                                                                                                                                } else {
                                                                                                                                                      Serial.print("Error on sending POST: ");
                                                                                                                                                            Serial.println(httpResponseCode);
                                                                                                                                                                }

                                                                                                                                                                    // Free resources
                                                                                                                                                                        http.end();
                                                                                                                                                                          } else {
                                                                                                                                                                              Serial.println("Error in WiFi connection");
                                                                                                                                                                                }
                                                                                                                                                                                }

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

// Replace with your network credentials
const char* ssid = "your_SSID";
const char* password = "your_PASSWORD";

// Server URL
const char* serverName = "http://your-server.com/traffic-data";

// Ultrasonic Sensor Pins
const int trigPin = 5;
const int echoPin = 18;

// Variables for distance measurement
long duration;
int distance;

void setup() {
  // Initialize Serial Monitor
    Serial.begin(115200);

      // Initialize Ultrasonic Sensor Pins
        pinMode(trigPin, OUTPUT);
          pinMode(echoPin, INPUT);

            // Connect to Wi-Fi
              Serial.print("Connecting to ");
                Serial.println(ssid);
                  WiFi.begin(ssid, password);

                    while (WiFi.status() != WL_CONNECTED) {
                        delay(500);
                            Serial.print(".");
                              }

                                Serial.println("");
                                  Serial.println("WiFi connected.");
                                    Serial.println("IP address: ");
                                      Serial.println(WiFi.localIP());
                                      }

                                      void loop() {
                                        // Clear the trigPin by setting it LOW
                                          digitalWrite(trigPin, LOW);
                                            delayMicroseconds(2);

                                              // Trigger the sensor by setting 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;

                                                              // Print the distance on the Serial Monitor
                                                                Serial.print("Distance: ");
                                                                  Serial.print(distance);
                                                                    Serial.println(" cm");

                                                                      // If a vehicle is detected (distance < threshold)
                                                                        if (distance < 100) {
                                                                            sendTrafficData(distance);
                                                                              }

                                                                                delay(1000);
                                                                                }

                                                                                void sendTrafficData(int distance) {
                                                                                  if (WiFi.status() == WL_CONNECTED) {
                                                                                      HTTPClient http;

                                                                                          // Specify content-type header
                                                                                              http.begin(serverName);
                                                                                                  http.addHeader("Content-Type", "application/x-www-form-urlencoded");

                                                                                                      // Prepare data to be sent
                                                                                                          String httpRequestData = "distance=" + String(distance);

                                                                                                              // Send HTTP POST request
                                                                                                                  int httpResponseCode = http.POST(httpRequestData);

                                                                                                                      // If the response code is greater than 0, the request was successful
                                                                                                                          if (httpResponseCode > 0) {
                                                                                                                                String response = http.getString();
                                                                                                                                      Serial.println(httpResponseCode);
                                                                                                                                            Serial.println(response);
                                                                                                                                                } else {
                                                                                                                                                      Serial.print("Error on sending POST: ");
                                                                                                                                                            Serial.println(httpResponseCode);
                                                                                                                                                                }

                                                                                                                                                                    // Free resources
                                                                                                                                                                        http.end();
                                                                                                                                                                          } else {
                                                                                                                                                                              Serial.println("Error in WiFi connection");
                                                                                                                                                                                }
                                                                                                                                                                                }