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

// --- Network Settings ---
const char* WIFI_NAME = "Wokwi-GUEST";
const char* WIFI_PASSWORD = "";
WiFiClient client;

// --- ThingSpeak Settings ---
unsigned long myChannelNumber =  3238516; // Put your Channel ID here
const char * myWriteAPIKey = "EM5TJ1UYA9NQVALU"; 
// Put your Write API Key here

// --- Hardware Pins ---
#define DHTPIN 21
#define DHTTYPE DHT22
#define RELAY_PIN 26
LiquidCrystal lcd(19, 23, 18, 17, 16, 15);
DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(115200);
  dht.begin();
  pinMode(RELAY_PIN, OUTPUT);
  lcd.begin(16, 2);

  WiFi.begin(WIFI_NAME, WIFI_PASSWORD);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("WiFi Connected!");
  ThingSpeak.begin(client);
}

void loop() {
  float h = dht.readHumidity();
  float t = dht.readTemperature();
  int relayStatus = (t > 30.0) ? 1 : 0;

  digitalWrite(RELAY_PIN, relayStatus);

  // Update LCD
  lcd.setCursor(0, 0);
  lcd.print("T:"); lcd.print(t, 1);
  lcd.print(" H:"); lcd.print(h, 0);

  // Send to ThingSpeak
  ThingSpeak.setField(1, t);
  ThingSpeak.setField(2, h);
  ThingSpeak.setField(3, relayStatus);
  
  int x = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);

  if(x == 200){
    Serial.println("Channel update successful.");
  } else {
    Serial.println("Problem updating channel. HTTP error code " + String(x));
  }

  delay(20000); // ThingSpeak free tier requires 15+ seconds between updates
}