#include <ESP32Servo.h>
#include <WiFi.h>
#include <HTTPClient.h>

Servo myServo;            // Create a Servo object
const int trigPin = 12;  // GPIO for the Trigger pin of HC-SR04
const int echoPin = 14;  // GPIO for the Echo pin of HC-SR04

const char* ssid = "kishore";        // Replace with your WiFi SSID
const char* password = "kishore2006"; // Replace with your WiFi password
unsigned long myChannelNumber = 2628364;
const String thingSpeakServer = "http://api.thingspeak.com/update";
const String apiKey = "ZTCKD4XWEUTVLGCW"; // Replace with your ThingSpeak API key

void setup() {
  Serial.begin(115200);
  myServo.setPeriodHertz(50);  // Standard 50Hz servo
  myServo.attach(13);          // Attach the servo to GPIO 13

  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);

  // Connect to WiFi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("Connected to WiFi");
}

void loop() {
  // Send pulse
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  // Measure pulse duration
  long duration = pulseIn(echoPin, HIGH);

  // Convert duration to distance in cm
  float distance = (duration / 2.0) * 0.0344;

  if (distance <= 10) {
    myServo.write(90);  // Move servo to 90 degrees if distance <= 10 cm
  } else {
    myServo.write(0);   // Move servo to 0 degrees otherwise
  }

  // Send data to ThingSpeak
  if (WiFi.status() == WL_CONNECTED) {
    HTTPClient http;
    String url = thingSpeakServer + "?api_key=" + apiKey + "&field1=" + String(distance);
    http.begin(url);
    int httpCode = http.GET();
    
    if (httpCode > 0) {
      String payload = http.getString();
      Serial.println("ThingSpeak response: " + payload);
    } else {
      Serial.println("Error in HTTP request");
    }

    http.end();
  }

  delay(5000);  // Wait 5 seconds before the next measurement
}