/*
 * This ESP32 code is created by esp32io.com
 *
 * This ESP32 code is released in the public domain
 *
 * For more detail (instruction and wiring diagram), visit https://esp32io.com/tutorials/esp32-oled
 */

#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

// create an OLED display object connected to I2C
Adafruit_SSD1306 oled(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);


void setup() {
  Serial.begin(9600);

  float t,h;
  t=25;
  h=80;
  pinMode(15, OUTPUT);

  // initialize OLED display with I2C address 0x3C
  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() 
{
   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.display(); 
  delay(1000);

  if (Min>=1,Min<4){
    digitalWrite(15, HIGH);
  }else{
    digitalWrite(15, LOW);
  }
}