#include <WiFi.h>
#include "ThingSpeak.h"
#include <OneWire.h>
#include <DallasTemperature.h>
#include <LiquidCrystal_I2C.h>

// GPIO where the DS18B20 is connected to
const int oneWireBus = 4;     

// Setup a oneWire instance to communicate with any OneWire devices
OneWire oneWire(oneWireBus);

// Pass our oneWire reference to Dallas Temperature sensor 
DallasTemperature sensors(&oneWire);

LiquidCrystal_I2C LCD = LiquidCrystal_I2C(0x27, 16, 2);

const char* ssid = "Wokwi-GUEST";   // your network SSID (name) 
const char* password = "";

WiFiClient  client;

unsigned long myChannelNumber = 2220214;
const char * myWriteAPIKey = "RLSTSZ06GBSF03I9";

// Timer variables
unsigned long lastTime = 0;
unsigned long timerDelay = 30000;

void setup() {
  Serial.begin(115200);
  // Start the DS18B20 sensor
  sensors.begin();

  WiFi.mode(WIFI_STA);
  ThingSpeak.begin(Client);

  //initialize the LCD
  LCD.init();
  LCD.backlight();
  LCD.clear();
}

void loop() {
  sensors.requestTemperatures(); 
  float tempC = sensors.getTempCByIndex(0);
  float tempF = sensors.getTempFByIndex(0);

  if(tempC != DEVICE_DISCONNECTED_C || tempF != DEVICE_DISCONNECTED_F) 
  {
    Serial.print(tempC);
    Serial.println("ºC");
    Serial.print(tempF);
    Serial.println("ºF");

    LCD.clear();
    LCD.setCursor(0, 0);
    LCD.print("Temperature:");
    LCD.setCursor(0, 1);
    LCD.print(tempC);
    LCD.print("C ");
    LCD.print(tempF);
    LCD.print("F");
  } 
  else
  {
    Serial.println("Error: Could not read temperature data");

    LCD.clear();
    LCD.setCursor(0, 0);
    LCD.print("Read Error!");

  }
  
  delay(5000);

  if ((millis() - lastTime) > timerDelay) {
    
    // Connect or reconnect to WiFi
    if(WiFi.status() != WL_CONNECTED){
      Serial.print("Attempting to connect");
      while(WiFi.status() != WL_CONNECTED){
        WiFi.begin(ssid, password); 
        delay(5000);     
      } 
      Serial.println("\nConnected.");
    }
}