// simple project using Arduino UNO and 128x128 SD1107 OLED Display to show static image of compass 
// created by upir, 2023
// youtube channel: https://www.youtube.com/upir_upir

// YOUTUBE VIDEO: https://youtu.be/G1C09eoJ07c
// YOUTUBE VIDEO CLOCK: https://youtu.be/srgsBWHSNSQ

// links from the video:
// 128x128 SH1107 OLED Display: https://s.click.aliexpress.com/e/_DdOCQHj
// 128x64 SSD1306 OLED Display: https://s.click.aliexpress.com/e/_DCKdvnh
// Arduino UNO: https://s.click.aliexpress.com/e/_AXDw1h
// Arduino breadboard prototyping shield: https://s.click.aliexpress.com/e/_ApbCwx
// Photopea (online Photoshop-like tool): https://www.photopea.com/
// u8g2 documentation: https://github.com/olikraus/u8g2/wiki/u8gvsu8g2
// Image2cpp (convert array to image): https://javl.github.io/image2cpp/


// Related videos:
// Arduino OLED Clock Project: https://youtu.be/srgsBWHSNSQ
// Arduino Parking Sensor - https://youtu.be/sEWw087KOj0
// Turbo pressure gauge with Arduino and OLED display - https://youtu.be/JXmw1xOlBdk
// Arduino Car Cluster with OLED Display - https://youtu.be/El5SJelwV_0
// Knob over OLED Display - https://youtu.be/SmbcNx7tbX8
// Arduino + OLED = 3D ? - https://youtu.be/kBAcaA7NAlA
// Arduino OLED Gauge - https://youtu.be/xI6dXTA02UQ
// Smaller & Faster Arduino - https://youtu.be/4GfPQoIRqW8


#include <Arduino.h>
#include <U8g2lib.h> // u8g2 library for drawing on OLED display - needs to be installed in Arduino IDE first
#include <Wire.h> // wire library for IIC communication with the OLED display
#include "compass_image.h" // image generated using the image2cpp tool is stored in a separate header file

// if you see the image offset on the display, try uncommenting the "PIMORONI" version of the display, see video for more details
//U8G2_SH1107_128X128_1_HW_I2C u8g2(U8G2_R0); // final display, 128x128px [page buffer, size = 128 bytes], HW IIC connection
U8G2_SH1107_128X128_2_HW_I2C u8g2(U8G2_R0); // final display, 128x128px [page buffer, size = 256 bytes], HW IIC connection
//U8G2_SH1107_PIMORONI_128X128_2_HW_I2C u8g2(U8G2_R0); //[page buffer, size = 256 bytes], HW IIC connection

// IIC connection of the OLED display and Arduino UNO
// +5V > +5V
// GND > GND
// SCL (serial clock) > A5 or SCL
// SDA (serial data) > A4 or SDA

int speed = 0;
char speed_string[10];

int needle_angle_deg;
int needle_start_x;
int needle_start_y;
int needle2_start_x;
int needle2_start_y;
int needle_end_x;
int needle_end_y;
int needle_center_x = 63;
int needle_center_y = 72;
int needle_radius_white = 57;
int needle_radius_black = 23;
int needle_offset_x;
int needle_offset_y;

int oldValue = LOW;

void setup(void) { // Arduino setup
  u8g2.begin();  // begin the u8g2 library
  u8g2.setContrast(255); // set display contrast/brightness
}

void loop(void) { // main Arduino loop

  start = millis();
  speed = speed + 1;
  delay(500);
  needle_angle_deg = map(speed,0,50,45,315);

  int ones_place = speed % 10;
  int tens_place  = ((speed  - ones_place)/10) % 10;

  needle_start_x = needle_radius_white * -sin(radians(needle_angle_deg)) + needle_center_x;
  needle_start_y = needle_radius_white * cos(radians(needle_angle_deg)) + needle_center_y;

  needle2_start_x = needle_radius_black * -sin(radians(needle_angle_deg)) + needle_center_x;
  needle2_start_y = needle_radius_black * cos(radians(needle_angle_deg)) + needle_center_y;

  if((needle_angle_deg > 45 && needle_angle_deg < 135) || (needle_angle_deg > 225 && needle_angle_deg < 315)){
    needle_offset_x = 0;
    needle_offset_y = 1;
  } else {
    needle_offset_x = 1;
    needle_offset_y = 0;
  }

  u8g2.firstPage(); // select the first page of the display (page is 128x8px or 128x16px), since we are using the page drawing method of the u8g2 library
  do { // draw

    u8g2.drawXBMP(0, 0, 128, 128, epd_bitmap__gauge_bg); // draw fullscreen 128x128px image (drawn in Photopea, generated using image2cpp)
    
    u8g2.drawLine(needle_center_x,needle_center_y,needle_start_x,needle_start_y);
    u8g2.drawLine(needle_center_x + needle_offset_x,needle_center_y + needle_offset_y,needle_start_x + needle_offset_x,needle_start_y + needle_offset_y);
    
    u8g2.setDrawColor(0);
    u8g2.drawDisc(needle_center_x, needle_center_y, 23, U8G2_DRAW_ALL);       //mask needle in speed circle
    u8g2.drawDisc(needle_center_x + 1, needle_center_y, 23, U8G2_DRAW_ALL);
    u8g2.setDrawColor(1);

    u8g2.drawXBMP(64, 60, 16, 21, epd_bitmap_allArray[ones_place]); //draw ones place
    u8g2.drawXBMP(47, 60, 16, 21, epd_bitmap_allArray[tens_place]); //draw tens place
    u8g2.drawXBMP(52, 85, 24, 9, epd_bitmap__mph); // draw mph label

  } while ( u8g2.nextPage() ); // go over all the pages until the whole display is updated
}