#include "DHT.h"
#include <WiFi.h>
#include <ThingSpeak.h>

#define DHTPIN 4      // Digital pin connected to the DHT sensor
#define DHTTYPE DHT22 // DHT 11

#define PIR_PIN 19    // GPIO19 pin connected to OUTPUT pin of the PIR sensor

DHT dht(DHTPIN, DHTTYPE);

int pinStateCurrent = LOW;   // current state of pin
int pinStatePrevious = LOW;  // previous state of pin

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char *thingSpeakApiKey = "APWMC9JZ10A3IKUV";
const unsigned long channelId = 1;

WiFiClient client;

void setup() {
  Serial.begin(9600);
  Serial.println(F("DHT11 and PIR test!"));

  dht.begin();
  pinMode(PIR_PIN, INPUT);

  connectToWiFi();
  ThingSpeak.begin(client);
}

void loop() {
  // DHT11 sensor readings
  float h = dht.readHumidity();
  float t = dht.readTemperature();

  if (isnan(h) || isnan(t)) {
    Serial.println(F("Failed to read from DHT11 sensor!"));
  } else {
    Serial.print(F("Humidity: "));
    Serial.print(h);
    Serial.print(F("%  Temperature: "));
    Serial.print(t);
    Serial.print(F("°C"));

    // PIR sensor readings
    pinStatePrevious = pinStateCurrent;
    pinStateCurrent = digitalRead(PIR_PIN);

    if (pinStatePrevious == LOW && pinStateCurrent == HIGH) {
      Serial.println(F("  Motion detected!"));
      sendDataToThingSpeak(t, h, 1);  // 1 indicates motion detected
    } else if (pinStatePrevious == HIGH && pinStateCurrent == LOW) {
      Serial.println(F("  Motion stopped!"));
      sendDataToThingSpeak(t, h, 0);  // 0 indicates no motion
    } else {
      Serial.println();  // Print a newline for better readability
    }
  }

  delay(2000);  // Adjust delay as needed
}

void sendDataToThingSpeak(float temperature, float humidity, int motionStatus) {
  ThingSpeak.setField(1, temperature);
  ThingSpeak.setField(2, humidity);
  ThingSpeak.setField(3, motionStatus);

  int status = ThingSpeak.writeFields(channelId, thingSpeakApiKey);

  if (status == 200) {
    Serial.println(F("Data sent to ThingSpeak successfully!"));
  } else {
    Serial.print(F("Error sending data to ThingSpeak. Status code: "));
    Serial.println(status);
  }
}

void connectToWiFi() {
  Serial.print(F("Connecting to WiFi..."));
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.print(F("."));
  }
  Serial.println(F("\nConnected to WiFi"));
}