#include <WiFi.h>
#include <DHT.h>
#include <Wire.h> // Required for STM32
#include "ThingSpeak.h"

#define DHTPIN PA0    // Define the GPIO pin connected to DHT22 (for STM32)
#define DHTTYPE DHT22 // DHT type is DHT22

#define LED_PIN PB1   // Define the LED pin (for STM32)

const char* WIFI_NAME = "Wokwi-GUEST";
const char* WIFI_PASSWORD = "";
const int myChannelNumber = 1914951;
const char* myApiKey = "Q35JGHUROYYFOJSL";
const char* server = "api.thingspeak.com";

DHT dht(DHTPIN, DHTTYPE);
WiFiClient client;

void setup() {
  Serial.begin(115200);
  dht.begin();
  pinMode(LED_PIN, OUTPUT);

  WiFi.begin((char*)WIFI_NAME, WIFI_PASSWORD);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi..");
  }
  Serial.println("WiFi connected !");
  
  // Print local IP address
  Serial.print("Local IP: ");
  Serial.println(WiFi.localIP());

  ThingSpeak.begin(client);
}

void loop() {
  delay(2000); // Allow some time for sensor to stabilize

  float temperature = dht.readTemperature(); // Read temperature in Celsius
  float humidity = dht.readHumidity();       // Read humidity in %

  if (isnan(temperature) || isnan(humidity)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  // Update ThingSpeak fields
  ThingSpeak.writeField(myChannelNumber, 1, temperature, myApiKey);
  ThingSpeak.writeField(myChannelNumber, 2, humidity, myApiKey);

  // Control LED based on conditions
  if (temperature > 35 || temperature < 12 || humidity > 70 || humidity < 40) {
    digitalWrite(LED_PIN, HIGH); // Turn on LED if conditions met
  } else {
    digitalWrite(LED_PIN, LOW); // Turn off LED
  }

  // Output temperature and humidity to serial monitor
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println("°C");
  Serial.print("Humidity: ");
  Serial.print(humidity);
  Serial.println("%");

  // Check ThingSpeak write status
  int status = ThingSpeak.writeFields(myChannelNumber, myApiKey);
  if (status == 200) {
    Serial.println("Data sent successfully to ThingSpeak!");
  } else {
    Serial.print("Failed to send data. Error code: ");
    Serial.println(status);
  }

  Serial.println("---");
  delay(10000); // Delay between updates (in ms)
}