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

#define DHTPIN 15
#define DHTTYPE DHT11
#define PIRPIN 14
#define LDRPIN 13
#define TRIGPIN 12
#define ECHOPIN 27
#define SERVOPIN 26

const char* ssid = "Wokwi-GUEST";
const char* password = "";

const char* apiKey = "5NSOEEHW6WZHY042";
const char* channelID = "3023129";

DHT dht(DHTPIN, DHTTYPE);
Servo myServo;

void setup() {
  Serial.begin(115200);
    dht.begin();

      pinMode(PIRPIN, INPUT);
        pinMode(LDRPIN, INPUT);
          pinMode(TRIGPIN, OUTPUT);
            pinMode(ECHOPIN, INPUT);

              myServo.setPeriodHertz(50);
                myServo.attach(SERVOPIN, 500, 2400);
                  myServo.write(0);

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

                                      void loop() {
                                        // Read sensor values
                                          float temp = dht.readTemperature();
                                            float hum = dht.readHumidity();
                                              int motionDetected = digitalRead(PIRPIN);
                                                int light = digitalRead(LDRPIN);

                                                  // Ultrasonic distance
                                                    digitalWrite(TRIGPIN, LOW);
                                                      delayMicroseconds(2);
                                                        digitalWrite(TRIGPIN, HIGH);
                                                          delayMicroseconds(10);
                                                            digitalWrite(TRIGPIN, LOW);
                                                              long duration = pulseIn(ECHOPIN, HIGH);
                                                                float distance_cm = duration * 0.034 / 2;

                                                                  // Control Servo
                                                                    if (distance_cm > 100) {
                                                                        myServo.write(90);
                                                                          } else {
                                                                              myServo.write(0);
                                                                                }

                                                                                  // Send data to ThingSpeak
                                                                                    if (WiFi.status() == WL_CONNECTED) {
                                                                                        HTTPClient http;

                                                                                            String url = "http://api.thingspeak.com/update?api_key=";
                                                                                                url += apiKey;
                                                                                                    url += "&field1=" + String(temp);
                                                                                                        url += "&field2=" + String(hum);
                                                                                                            url += "&field3=" + String(distance_cm);
                                                                                                                url += "&field4=" + String(light);
                                                                                                                    url += "&field5=" + String(motionDetected);

                                                                                                                        http.begin(url);
                                                                                                                            int httpCode = http.GET();

                                                                                                                                if (httpCode > 0) {
                                                                                                                                      Serial.println("Data sent to ThingSpeak.");
                                                                                                                                          } else {
                                                                                                                                                Serial.print("Error sending data: ");
                                                                                                                                                      Serial.println(http.errorToString(httpCode));
                                                                                                                                                          }

                                                                                                                                                              http.end();
                                                                                                                                                                }

                                                                                                                                                                  // Print data locally
                                                                                                                                                                    Serial.println("----- Sensor Readings -----");
                                                                                                                                                                      Serial.print("Temp: "); Serial.println(temp);
                                                                                                                                                                        Serial.print("Humidity: "); Serial.println(hum);
                                                                                                                                                                          Serial.print("Distance: "); Serial.println(distance_cm);
                                                                                                                                                                            Serial.print("Light: "); Serial.println(light ? "Bright" : "Dark");
                                                                                                                                                                              Serial.print("Motion: "); Serial.println(motionDetected ? "YES" : "NO");
                                                                                                                                                                                Serial.println("---------------------------\n");

                                                                                                                                                                                  delay(20000); // ThingSpeak allows updates every 15s (minimum)
                                                                                                                                                                                  }