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

const int DHT_PIN = 15; // DHT22 sensor GPIO Pin
const char* WIFI_NAME = "Wokwi-GUEST"; // WiFi SSID
const char* WIFI_PASSWORD = ""; // WiFI Password
const int myChannelNumber = 2485437; // ThingSpeak channel number
const char* myApiKey = "Y1AW649A4WULA9NU"; // ThingSpeak API key
const char* server = "api.thingspeak.com"; // ThingSpeak server address

// NTC sensor and LED setup
const int NTC_PIN = 32; // ADC pin connected to the NTC sensor
const int LED_PIN = 2; // GPIO pin for the LED
const float beta = 3950.0; // Beta coefficient
const float seriesResistor = 10000.0; // Series resistor value
const float thermistorNominal = 10000.0; // Resistance at 25 degrees C
const float temperatureNominal = 25.0; // Nominal temperature

DHTesp dhtSensor;
WiFiClient client;


void setup() {
    Serial.begin(115200);
    dhtSensor.setup(DHT_PIN, DHTesp::DHT22);
    // WiFi.begin(WIFI_NAME, WIFI_PASSWORD);
    // while (WiFi.status() != WL_CONNECTED){
    //     delay(1000);
    //     Serial.println("Wifi not connected");
    // }
    // Serial.println("Wifi connected !");
    Serial.println("Local IP: " + String(WiFi.localIP()));
    WiFi.mode(WIFI_STA);
    ThingSpeak.begin(client);
}

void loop() {
    TempAndHumidity data = dhtSensor.getTempAndHumidity();

      // Read from the NTC sensor
      int analogValue = analogRead(NTC_PIN);
      float resistance = (4095.0 / analogValue) - 1;
      resistance = seriesResistor / resistance;
      float steinhart = resistance / thermistorNominal; // (R/Ro)
      steinhart = log(steinhart); // ln(R/Ro)
      steinhart /= beta; // 1/B * ln(R/Ro)
      steinhart += 1.0 / (temperatureNominal + 273.15); // + (1/To)
      steinhart = 1.0 / steinhart; // Invert
      steinhart -= 273.15; // Convert to Celsiu


    ThingSpeak.setField(1, data.temperature);
    ThingSpeak.setField(2, data.humidity);
    ThingSpeak.setField(3, steinhart); // NTC sensor temperature

    int status = ThingSpeak.writeFields(myChannelNumber, myApiKey);
  
    Serial.println("Temp: " + String(data.temperature, 2) + "°C");
    Serial.println("Humidity: " + String(data.humidity, 1) + "%");
    Serial.println("NTC Temp: " + String(steinhart, 2) + "°C");

    Serial.println(steinhart);
    if (steinhart > 20) {
      digitalWrite(LED_PIN, HIGH);
      Serial.println("High temperature detected! LED on.");
    } else {
      digitalWrite(LED_PIN, LOW);
  }

    if(status == 200){
        Serial.println("Data pushed successfully");
    } else {
        Serial.println("Push error" + String(status));
    }
    Serial.println("---");

    delay(1000);
}