// simple project using Arduino UNO and 128x64 SSD1306 IIC OLED Display, created by upir, 2023
// youtube channel: https://www.youtube.com/upir_upir

// YOUTUBE VIDEO: https://youtu.be/Eyvzw_ujcS0
// More videos with Arduino UNO and OLED screens: https://www.youtube.com/playlist?list=PLjQRaMdk7pBZ1UV3IL5ol8Qc7R9k-kwXA

#include <Arduino.h>
#include <U8g2lib.h>

#include <Wire.h> // library requires for IIC communication

int ledblue = 3;
int ledRed = 5;
int button  = 0;      // variable to store the read value
int button2  = 0;      // variable to store the read value
int speedINT  = 0;
char buffer[4];      // variable to store the read value
int DMG1 = 0;

U8G2_SSD1306_128X64_NONAME_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE); // initialization for the used OLED display

static const unsigned char image_Down_hvr_bits[] U8X8_PROGMEM = {0xf8,0xff,0x3f,0x00,0xfc,0xff,0x7f,0x00,0xfe,0xff,0xff,0x00,0xff,0xff,0xff,0x01,0xff,0xff,0xff,0x01,0xff,0xff,0xff,0x01,0xff,0xff,0xff,0x01,0xff,0xff,0xff,0x01,0xff,0xff,0xff,0x01,0x0f,0x00,0xe0,0x01,0x0f,0x00,0xe0,0x01,0x1f,0x00,0xf0,0x01,0x3f,0x00,0xf8,0x01,0x7f,0x00,0xfc,0x01,0xff,0x00,0xfe,0x01,0xff,0x01,0xff,0x01,0xff,0x83,0xff,0x01,0xff,0xc7,0xff,0x01,0xff,0xef,0xff,0x01,0xff,0xff,0xff,0x01,0xff,0xff,0xff,0x01,0xff,0xff,0xff,0x01,0xff,0xff,0xff,0x01,0xff,0xff,0xff,0x01,0xfe,0xff,0xff,0x00,0xfc,0xff,0x7f,0x00,0xf8,0xff,0x3f,0x00};
static const unsigned char image_Up_hvr_bits[] U8X8_PROGMEM = {0xf8,0xff,0x3f,0x00,0xfc,0xff,0x7f,0x00,0xfe,0xff,0xff,0x00,0xff,0xff,0xff,0x01,0xff,0xff,0xff,0x01,0xff,0xff,0xff,0x01,0xff,0xff,0xff,0x01,0xff,0xef,0xff,0x01,0xff,0xc7,0xff,0x01,0xff,0x83,0xff,0x01,0xff,0x01,0xff,0x01,0xff,0x00,0xfe,0x01,0x7f,0x00,0xfc,0x01,0x3f,0x00,0xf8,0x01,0x1f,0x00,0xf0,0x01,0x0f,0x00,0xe0,0x01,0x0f,0x00,0xe0,0x01,0xff,0xff,0xff,0x01,0xff,0xff,0xff,0x01,0xff,0xff,0xff,0x01,0xff,0xff,0xff,0x01,0xff,0xff,0xff,0x01,0xff,0xff,0xff,0x01,0xff,0xff,0xff,0x01,0xfe,0xff,0xff,0x00,0xfc,0xff,0x7f,0x00,0xf8,0xff,0x3f,0x00};

void setup(void) {
  u8g2.begin(); // start the u8g2 library
  pinMode(2, INPUT_PULLUP);
  pinMode(3, OUTPUT);
  pinMode(4, INPUT_PULLUP);
  pinMode(5, OUTPUT);
   pinMode(7, INPUT_PULLUP);
}

void loop(void) {
  u8g2.clearBuffer();					// clear the internal memory

u8g2.setBitmapMode(1);
u8g2.setFontMode(1);
u8g2.drawXBMP(2, 21, 25, 27, image_Down_hvr_bits);
u8g2.drawXBMP(2, -1, 25, 27, image_Up_hvr_bits);
u8g2.setFont(u8g2_font_logisoso42_tr);
sprintf(buffer, "%d", speedINT); 
u8g2.drawStr(44, 46, buffer);

u8g2.sendBuffer();					// transfer internal memory to the display

button  = digitalRead(2);   // read the input pin
button2  = digitalRead(4);   // read the input pin
DMG1  = digitalRead(7);

if (button ==  LOW )
 if (speedINT < 6) speedINT = speedINT + 1;
if (button2 ==  LOW )
 if (speedINT > 0) speedINT = speedINT - 1;

    if (button ==  LOW )
    {
      digitalWrite(ledblue, HIGH);
    } else
    {
      digitalWrite(ledblue, LOW);
    }
 if (button2 ==  LOW )
    {
      digitalWrite(ledRed, HIGH);
    } else
    {
      digitalWrite(ledRed, LOW);
    }
    
}