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

const char* WIFI_NAME = "Wokwi-GUEST"; // WiFi ssid
const char* WIFI_PWD = ""; // password
#define WIFI_CHANNEL 1

const int myChannelID = 2409976; // cloud channel ID
const char* myApiKey = "RS9MRXAQBNYQ1WDW"; // Cloud Api key
const char* server = "api.thingspeak.com"; // connect to ThingSpeak server

// get wifi 
WiFiClient client; // Wifi client class

OneWire oneWire(10);
DallasTemperature sensor(&oneWire);

//declaring lcd
LiquidCrystal_I2C lcd(0x27, 30, 4);


const int ledPin = 8;
const int ledPin1 = 4;
const int sensorPin = 2;

int sensorMin = 0;  // minimum sensor value
int sensorMax = 30; // maximum temperature value
int sensorValue = 0; // sensor value

void setup() {
  Serial.begin(115200);
  lcd.init();
  lcd.backlight();
  lcd.setCursor(1, 0);

  lcd.println("Env Temperature!");
  delay(5000);

  // sensor.begin();
  pinMode(ledPin, OUTPUT);
  pinMode(ledPin1, OUTPUT);
  delay(2);
  sensor.begin();
  delay(20);

  ThingSpeak.begin(client);
}

void loop() {
// lcd.print(sensorMax);
  sensor.requestTemperatures(); // Send the command to get temperatures
  float temperatureC = sensor.getTempCByIndex(0);
  float temperatureF = sensor.getTempFByIndex(0);
  
  lcd.clear();
   if(temperatureC == -127.00){
    lcd.println("Failed to read from DS18B20 sensor");
    } else {
      lcd.setCursor(0,0);
      lcd.println("Temperature is:");
      lcd.setCursor(0, 1);
      lcd.print("... ");
      lcd.print(temperatureC);
      lcd.print("\xDF");
      lcd.print("C");
      lcd.print(" ...");
      delay(1000);
    }
 
  if(temperatureC > sensorMax){
    // when temperature is above 30 degrees celcius blink red led
    digitalWrite(ledPin, HIGH);   // turn the LED on (HIGH is the voltage level)
    delay(10);                       // wait for a second
    digitalWrite(ledPin, LOW);    // turn the LED off by making the voltage LOW
    delay(10);                       // wait for a second
    }else{
    // when temperature is moderate blink green led
    digitalWrite(ledPin1, HIGH);   // turn the LED on (HIGH is the voltage level)
    delay(500);                       // wait for a second
    digitalWrite(ledPin1, LOW);    // turn the LED off by making the voltage LOW
    delay(500);                       // wait for a second
    }

  Serial.print("Temperature is: ");
  delay(10);
  Serial.println(sensor.getTempCByIndex(0));

  ThingSpeak.setField(1,temperatureC); //send data to ThingSpeak
    int x = ThingSpeak.writeFields( myChannelID, myApiKey);
    if(x == 200){
      Serial.println("Channel update successful. ");
      Serial.println("Temperature " + String(temperatureC));
    }
    else{
      Serial.println("Problem updating channel. HTTP error code " + String(x));
    }
  delay(10);
}

void setup_wifi() { 
  delay(10);
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(WIFI_NAME);

  WiFi.mode(WIFI_STA); 
  WiFi.begin(WIFI_NAME, WIFI_PWD, WIFI_CHANNEL);

  while (WiFi.status() != WL_CONNECTED) { 
    delay(500);
    Serial.print(".");
  }

  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}