#include <OneWire.h>
#include <DallasTemperature.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128 // OLED width,  in pixels
#define SCREEN_HEIGHT 64 // OLED height, in pixels
Adafruit_SSD1306 oled(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

const int SensorDataPin = 13;     

OneWire oneWire(SensorDataPin);
 
DallasTemperature sensors(&oneWire);
int LED=12;
void setup() {

  Serial.begin(115200);
  sensors.begin();

  pinMode(LED, OUTPUT);

  if (!oled.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("failed to start SSD1306 OLED"));
    while (1);
  }

  delay(1000);         // wait two seconds for initializing
  oled.clearDisplay(); // clear display

  oled.setTextSize(2);         // set text size
  oled.setTextColor(WHITE);    // set text color
  oled.setCursor(0, 10);       // set position to display
  oled.println("Hi~~~"); // set text
  oled.println("Count time");
  oled.println("3..2..1!");
  oled.display();              // display on OLED 
  delay(5000);

  oled.clearDisplay(); // clear display
  oled.setTextSize(2); 
  oled.setCursor(30, 30);
  oled.println("Go!!!!");
  oled.display();              // display on OLED
  delay(5000);

  oled.clearDisplay();
  oled.display(); 
}
int Hr,Min,Sec;

void loop() {

  sensors.requestTemperatures(); 
  float temperature_Celsius = sensors.getTempCByIndex(0);
  float temperature_Fahrenheit = sensors.getTempFByIndex(0);
  Serial.print("Temperature: ");
  Serial.print(temperature_Celsius);
  Serial.println(" ºC");
  Serial.print("Temperature: ");
  Serial.print(temperature_Fahrenheit);
  Serial.println(" ºF");
  Serial.println("");

   int time_now = millis()/1000;
  Sec = time_now%60;
  if(Sec==0)
  {
    Min++;
    if(Min>59)
    {
      Min=0;
      Hr++;
    }
  }
  oled.clearDisplay(); // clear display
  oled.setTextSize(1.5);         // set text size
  oled.setTextColor(WHITE);    // set text color
  oled.setCursor(0, 10);       // set position to display
  oled.println("Time Counter"); // set text
  oled.print("Sec  = ");
  oled.println(Sec);
  oled.print("Min  = ");
  oled.println(Min);
  oled.print("Hr  = ");
  oled.println(Hr);
  oled.print("Temper  = ");
  oled.print(temperature_Celsius);
  oled.println(" C");
  oled.display(); 
  
  delay(1000);

  if (temperature_Celsius <= 100){
    digitalWrite(LED, HIGH);
  }else{
    digitalWrite(LED, LOW);
  }
}