#include <DHTesp.h>
#include <WiFi.h>
#include <ThingSpeak.h>

// DHT declaration
DHTesp dhtSensor;
TempAndHumidity data;
const int dhtpin = 15;

// Ultrasonic declaration
const int echo = 4;
const int trig = 2;
float distance;
float duration;

// PIR declaration
const int pirpin = 14;

// WiFi declaration
char ssid[] = "Wokwi-GUEST";
char pass[] = "";
WiFiClient client;

// Thingspeak declaration
unsigned long myChannelNumber = 2264423;
const char *myWriteAPIKey = "H4YOHLR8HLDIOR2Y";
int statusCode;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);

  // Ultrasonic setup
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);

  // DHT setup
  dhtSensor.setup(dhtpin, DHTesp::DHT22);

  // PIR setup
  pinMode(pirpin, INPUT_PULLUP);

  // WiFi setup
  WiFi.mode(WIFI_STA);

  // Thingspeak setup
  ThingSpeak.begin(client);
  delay(1000);
}

// Ultrasonic function
float getdistance() {
  digitalWrite(trig, LOW);
  delayMicroseconds(2);
  digitalWrite(trig, HIGH);
  delayMicroseconds(10);
  digitalWrite(trig, LOW);
  duration = pulseIn(echo, HIGH);
  return duration * 0.034 / 2;
}

void loop() {
  // Check PIR sensor
  int motion = digitalRead(pirpin);
  Serial.println(motion == HIGH ? "Motion detected!" : "Motion not detected!");

  // WiFi connection
  if (WiFi.status() != WL_CONNECTED) {
    Serial.print("Attempting to connect...");
    while (WiFi.status() != WL_CONNECTED) {
      WiFi.begin(ssid, pass);
      Serial.print(".");
      delay(5000);
    }
    Serial.println("\nConnected");
  }

  // Read DHT sensor
  data = dhtSensor.getTempAndHumidity();

  // Read distance
  distance = getdistance();

  Serial.println("Humi:" + String(data.temperature));
  Serial.println("Temp:" + String(data.humidity));
  Serial.println("Distance:" + String(distance));
  Serial.println("<-------------------->");

  // Data uploading to ThingSpeak
  ThingSpeak.setField(1, data.temperature);
  ThingSpeak.setField(2, data.humidity);
  ThingSpeak.setField(3, distance);
  ThingSpeak.setField(4, motion);
  statusCode = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);

  if (statusCode == 200) {
    Serial.println("Channel update successful");
  } else {
    Serial.println("Problem Writing data: HTTP error code:" + String(statusCode));
  }
  delay(15000);
}