#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <Keypad.h>

#define OLED_RESET 4
Adafruit_SSD1306 display(OLED_RESET);
#define FRAME_DELAY (42)
#define FRAME_WIDTH (48)
#define FRAME_HEIGHT (48)
#define FRAME_COUNT (sizeof(frames) / sizeof(frames[0]))
const byte PROGMEM frames[][288] = {
  {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,3,254,0,0,0,127,255,254,0,0,0,255,240,6,0,0,1,192,0,6,0,0,0,224,0,30,0,252,0,127,255,252,0,255,0,31,255,248,0,227,0,6,0,16,2,97,128,6,0,56,7,97,192,6,0,63,135,96,192,30,0,127,247,96,127,255,1,224,127,48,127,131,255,192,31,48,0,1,255,0,7,48,0,0,0,0,3,24,0,0,0,0,3,28,0,0,0,0,7,14,0,0,0,0,15,7,128,0,0,0,31,1,240,0,0,0,127,0,127,0,0,3,231,0,7,255,0,127,135,0,0,127,255,252,2,0,0,0,255,128,0,0,0,0,1,192,0,0,0,0,0,248,0,0,0,0,0,252,0,0,0,0,0,204,0,0,0,0,0,204,0,0,0,0,0,252,0,0,0,0,0,120,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
  {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,3,252,0,0,0,31,255,254,0,0,0,255,254,6,0,0,1,192,0,6,0,0,0,224,0,14,0,112,0,255,255,252,0,254,0,63,255,248,0,255,0,6,0,16,0,97,128,6,0,56,2,97,128,6,0,63,7,96,192,6,0,127,231,96,255,254,1,224,127,48,127,255,255,192,30,48,0,1,255,0,7,48,0,0,0,0,3,24,0,0,0,0,3,24,0,0,0,0,7,30,0,0,0,0,15,7,128,0,0,0,31,3,224,0,0,0,63,0,126,0,0,1,247,0,15,252,0,31,194,0,0,255,255,254,0,0,0,0,255,224,0,0,0,0,1,192,0,0,0,0,0,248,0,0,0,0,0,252,0,0,0,0,0,204,0,0,0,0,0,204,0,0,0,0,0,252,0,0,0,0,0,120,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
  {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,124,0,0,0,0,255,254,0,0,0,255,255,134,0,0,1,254,0,6,0,0,0,192,0,14,0,0,0,248,0,252,0,254,0,63,255,248,0,255,0,7,255,48,0,67,128,6,0,48,0,97,128,6,0,63,2,96,192,6,0,63,231,96,225,254,0,224,255,48,127,255,7,192,30,48,56,3,255,0,6,48,0,0,112,0,7,24,0,0,0,0,3,24,0,0,0,0,7,28,0,0,0,0,7,15,0,0,0,0,31,3,224,0,0,0,63,0,252,0,0,1,247,0,31,224,0,31,192,0,3,255,255,254,0,0,0,7,255,224,0,0,0,0,1,192,0,0,0,0,0,248,0,0,0,0,0,252,0,0,0,0,0,204,0,0,0,0,0,204,0,0,0,0,0,204,0,0,0,0,0,124,0,0,0,0,0,16,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
  {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,60,0,0,0,0,31,254,0,0,0,127,255,134,0,0,0,255,0,6,0,0,1,192,0,14,0,0,0,240,0,60,0,254,0,127,255,248,0,255,0,7,255,240,0,195,128,6,0,48,0,97,128,6,0,63,7,96,192,6,0,63,231,96,192,254,0,225,254,48,127,255,7,192,30,48,62,3,255,128,6,48,0,0,248,0,7,16,0,0,0,0,3,24,0,0,0,0,7,28,0,0,0,0,6,14,0,0,0,0,31,3,192,0,0,0,63,1,252,0,0,0,247,0,63,192,0,15,199,0,7,255,255,255,0,0,0,31,255,248,0,0,0,0,1,128,0,0,0,0,0,248,0,0,0,0,0,252,0,0,0,0,0,204,0,0,0,0,0,204,0,0,0,0,0,204,0,0,0,0,0,124,0,0,0,0,0,48,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
  {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,56,0,0,0,0,0,56,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,8,0,0,0,0,7,254,0,0,0,127,255,198,0,0,1,255,224,6,0,0,1,192,0,14,0,0,0,240,0,60,0,124,0,127,255,248,0,255,0,15,255,240,0,227,0,6,0,48,7,97,128,6,0,62,7,97,192,6,0,63,199,96,192,126,0,97,246,48,127,255,3,192,62,48,127,131,255,128,14,48,0,1,248,0,7,48,0,0,0,0,3,24,0,0,0,0,7,24,0,0,0,0,6,14,0,0,0,0,14,7,192,0,0,0,63,1,248,0,0,0,247,0,127,128,0,15,199,0,7,255,255,255,7,0,0,127,255,248,0,0,0,0,1,128,0,0,0,0,0,248,0,0,0,0,0,252,0,0,0,0,0,204,0,0,0,0,0,196,0,0,0,0,0,204,0,0,0,0,0,124,0,0,0,0,0,56,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
  {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,248,0,0,0,0,0,248,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,7,254,0,0,0,63,255,246,0,0,0,255,248,6,0,0,1,192,0,14,0,0,0,224,0,60,0,112,0,255,255,248,0,254,0,63,255,240,0,255,0,6,0,48,0,97,128,6,0,62,6,97,192,6,0,63,199,96,192,14,0,115,246,48,127,255,1,224,62,48,127,195,255,128,14,48,0,1,254,0,7,48,0,0,0,0,3,24,0,0,0,0,7,24,0,0,0,0,6,14,0,0,0,0,14,7,192,0,0,0,63,1,248,0,0,0,247,0,127,128,0,7,199,0,7,255,255,255,0,0,0,127,255,248,0,0,0,0,3,128,0,0,0,0,0,240,0,0,0,0,0,252,0,0,0,0,0,204,0,0,0,0,0,196,0,0,0,0,0,204,0,0,0,0,0,252,0,0,0,0,0,56,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
  {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,7,248,0,0,0,0,7,248,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,7,254,0,0,0,63,255,254,0,0,0,255,248,6,0,0,1,192,0,14,0,0,0,224,0,28,0,0,0,255,255,248,0,254,0,63,255,240,0,255,0,6,0,48,0,97,128,6,0,62,0,97,192,6,0,63,198,96,192,14,0,115,247,48,127,255,1,224,62,48,127,255,255,128,14,48,0,1,254,0,7,48,0,0,0,0,3,24,0,0,0,0,7,24,0,0,0,0,6,14,0,0,0,0,14,7,128,0,0,0,63,3,240,0,0,0,247,0,127,0,0,7,224,0,15,255,255,255,128,0,0,127,255,252,0,0,0,0,15,128,0,0,0,0,0,240,0,0,0,0,0,252,0,0,0,0,0,204,0,0,0,0,0,196,0,0,0,0,0,204,0,0,0,0,0,252,0,0,0,0,0,56,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
  {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,127,248,0,0,0,0,127,248,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,7,254,0,0,0,63,255,254,0,0,0,255,248,6,0,0,1,192,0,14,0,0,0,224,0,60,0,0,0,255,255,248,0,254,0,63,255,240,0,255,0,6,0,48,0,97,128,6,0,62,6,97,192,6,0,63,199,96,192,14,0,115,246,48,127,255,1,224,62,48,127,195,255,128,14,48,0,1,254,0,7,48,0,0,0,0,3,24,0,0,0,0,7,28,0,0,0,0,6,14,0,0,0,0,14,7,192,0,0,0,63,3,248,0,0,0,247,0,127,128,0,7,199,0,15,255,255,255,0,0,0,255,255,248,0,0,0,0,15,128,0,0,0,0,0,240,0,0,0,0,0,252,0,0,0,0,0,204,0,0,0,0,0,196,0,0,0,0,0,204,0,0,0,0,0,252,0,0,0,0,0,56,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
  {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,255,248,0,0,0,1,255,248,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,7,254,0,0,0,63,255,246,0,0,0,255,248,6,0,0,1,192,0,14,0,0,0,224,0,60,0,112,0,255,255,248,0,254,0,63,255,240,0,255,0,6,0,48,6,97,128,6,0,62,7,97,192,6,0,63,198,96,192,14,0,115,246,48,127,255,1,224,62,48,127,195,255,128,14,48,0,1,254,0,6,48,0,0,0,0,3,24,0,0,0,0,7,28,0,0,0,0,6,14,0,0,0,0,14,7,192,0,0,0,62,3,248,0,0,0,247,0,127,128,0,7,199,0,7,255,255,255,7,0,0,127,255,248,0,0,0,0,3,128,0,0,0,0,0,240,0,0,0,0,0,252,0,0,0,0,128,204,0,0,0,1,192,196,0,0,0,0,0,204,0,0,0,0,0,252,0,0,0,0,0,56,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
  {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,3,255,248,0,0,0,3,255,248,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,7,254,0,0,0,63,255,198,0,0,0,255,224,6,0,0,1,192,0,14,0,0,0,224,0,60,0,112,0,255,255,248,0,254,0,63,255,240,0,227,0,6,0,48,0,97,128,6,0,62,7,97,192,6,0,63,199,96,192,14,0,99,246,48,127,255,3,192,62,48,127,131,255,128,14,48,0,1,248,0,7,16,0,0,0,0,3,24,0,0,0,0,7,28,0,0,0,0,6,14,0,0,0,0,14,7,192,0,0,0,63,1,248,0,0,0,247,0,127,128,0,7,199,0,7,255,255,255,0,0,0,127,255,248,0,0,0,0,3,128,0,0,0,0,0,248,0,0,0,0,0,252,0,0,0,3,128,204,0,0,0,7,192,196,0,0,0,0,0,204,0,0,0,0,0,124,0,0,0,0,0,56,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
  {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,3,255,240,0,0,0,3,255,240,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,8,0,0,0,0,7,254,0,0,0,127,255,198,0,0,0,255,224,6,0,0,1,192,0,14,0,0,0,240,0,60,0,124,0,127,255,248,0,255,0,15,255,176,0,227,0,6,0,48,0,97,128,6,0,62,0,97,192,6,0,63,199,96,192,126,0,97,247,48,127,255,3,192,62,48,127,131,255,128,14,48,0,1,248,0,6,16,0,0,0,0,3,24,0,0,0,0,7,24,0,0,0,0,6,14,0,0,0,0,14,7,192,0,0,0,63,1,248,0,0,0,247,0,127,128,0,15,192,0,7,255,255,255,0,0,0,127,255,248,0,0,0,0,1,128,0,0,0,0,0,248,0,0,0,0,0,252,0,0,0,31,128,204,0,0,0,31,192,196,0,0,0,0,0,204,0,0,0,0,0,124,0,0,0,0,0,48,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
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  {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,15,254,0,0,0,255,255,198,0,0,0,254,0,6,0,0,0,192,0,6,0,56,0,252,0,60,0,254,0,63,255,248,0,127,0,7,255,248,0,97,128,6,0,24,0,97,192,6,0,62,2,96,192,6,0,63,199,48,103,254,0,115,247,48,127,255,7,192,127,48,0,1,255,128,14,48,0,0,124,0,7,24,0,0,0,0,3,24,0,0,0,0,3,14,0,0,0,0,6,7,128,0,0,0,14,1,224,0,0,0,62,0,126,0,0,0,255,0,15,224,0,15,231,0,1,255,255,255,0,0,0,7,255,248,0,0,0,0,3,128,0,0,0,0,1,240,0,0,0,0,0,248,0,0,0,0,0,204,0,0,0,0,1,140,0,0,0,0,0,204,0,0,0,0,0,248,0,0,0,0,0,112,0,0,0,0,0,0,0,0,0,0,0,0,0,12,0,0,0,0,0,12,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
  {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,15,254,0,0,0,255,255,254,0,0,0,255,240,6,0,0,0,192,0,6,0,0,0,248,0,28,0,254,0,127,255,248,0,255,0,7,255,248,0,97,128,6,0,16,0,97,128,6,0,62,0,96,192,6,0,63,194,96,225,254,0,115,247,48,127,255,1,224,127,48,56,3,255,128,15,48,0,0,252,0,7,24,0,0,0,0,3,24,0,0,0,0,3,28,0,0,0,0,7,7,0,0,0,0,14,3,224,0,0,0,31,0,252,0,0,0,255,0,31,192,0,7,226,0,3,255,255,255,128,0,0,31,255,252,0,0,0,0,3,128,0,0,0,0,1,240,0,0,0,0,0,248,0,0,0,0,0,204,0,0,0,0,0,140,0,0,0,0,0,204,0,0,0,0,0,252,0,0,0,0,0,120,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
  {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,31,254,0,0,0,127,255,254,0,0,0,255,240,6,0,0,0,192,0,6,0,0,0,240,0,30,0,254,0,127,255,252,0,255,0,15,255,248,0,195,128,6,0,16,0,97,128,6,0,56,2,96,192,6,0,63,135,96,192,126,0,115,247,48,127,255,1,224,127,48,127,3,255,128,14,48,0,1,254,0,7,16,0,0,0,0,3,24,0,0,0,0,3,28,0,0,0,0,7,15,0,0,0,0,15,3,192,0,0,0,31,0,248,0,0,0,127,0,63,192,0,3,231,0,7,255,255,255,130,0,0,63,255,252,0,0,0,0,3,128,0,0,0,0,1,192,0,0,0,0,0,248,0,0,0,0,0,220,0,0,0,0,0,204,0,0,0,0,0,204,0,0,0,0,0,252,0,0,0,0,0,120,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}
};
const byte ROWS = 4; 
const byte COLS = 4; 
char keys[ROWS][COLS] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'M', '0', '=', 'D'}
};
byte rowPins[ROWS] = {5, 6, 7, 8}; 
byte colPins[COLS] = {9, 10, 11, 12};
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

String input = "";
float num1 = 0, num2 = 0, num3 = 0;
char operation;
bool isFirstSet = true;
int frame = 0;
int starttime;

void setup() {
 display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
 display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0,0);
  display.println("Welcome to our");
  display.display();
  display.setCursor(0,10);
  display.println("UAM Calculator");
  display.display();
  display.setCursor(0,20);
  display.println("by Group Manese");
  display.display();
  delay(2000);
  display.clearDisplay();
  display.setCursor(0,0);
  display.println("Choose:");
  display.display();
  display.setCursor(0,10);
  display.println("Velocity (A)");
  display.display();
  display.setCursor(0,20);
  display.println("Distance (B)");
  display.display();
  display.setCursor(0,30);
  display.println("Time (C)");
  display.display();

}

void loop() {
  char key = keypad.getKey();
  if (key) {
    input += key;
    display.setCursor(90,0);
    display.println(key);
    display.display();
    if (isFirstSet == true) {
      if (key == 'A') { 
        display.clearDisplay();
        display.display();
        velocity();
      }
      if (key == 'B') { 
        display.clearDisplay();
        display.display();
        distance();
      }
      if (key == 'C') { 
        display.clearDisplay();
        display.display();
        time();
      }
    } else { 
      if (key == 'A') { 
        display.clearDisplay();
        display.display();
        initial();
      }
      if (key == 'B') { 
        display.clearDisplay();
        display.display();
        finalv();
      }
      if (key == 'C') { 
        display.clearDisplay();
        display.display();
        accelerate();
      }
    }
    
    if (key == 'D') {
      isFirstSet = false;
      display.clearDisplay();
      display.display();
      display.setCursor(0,0);
      display.println("Initial V. (A)");
      display.display();
      display.setCursor(0,10);
      display.println("Final V. (B)");
      display.display();
      display.setCursor(0,20);
      display.println("Accelaration (C)");
      display.display(); 
    }
  }
}

void velocity(){
  String distanceInput = ""; 
  String timeInput = ""; 
  
  display.clearDisplay(); 
  
  display.setCursor(0,0);
  display.print("Enter distance:");
  display.display();
  
  bool distanceEntered = false;
  bool timeEntered = false;

  while (!distanceEntered || !timeEntered) {
    char key1 = keypad.getKey();
    if (key1) {
      if (key1 >= '0' && key1 <= '9') {
        if (!distanceEntered) {
          distanceInput += key1;
          display.clearDisplay(); 
          display.setCursor(0,0);
          display.print("Enter distance:");
          display.setCursor(0,10);
          display.print(distanceInput); 
          display.display();
        } else if (!timeEntered) {
          timeInput += key1;
          display.clearDisplay(); 
          display.setCursor(0,0);
          display.print("Enter time:");
          display.setCursor(0,10);
          display.print(timeInput); 
          display.display();
        }
      }
      else if (key1 == 'M') {
        if (!distanceEntered && distanceInput.length() > 0) {
          distanceInput.remove(distanceInput.length() - 1);
          display.clearDisplay(); 
          display.setCursor(0,0);
          display.print("Enter distance:");
          display.setCursor(0,10);
          display.print(distanceInput); 
          display.display();
        } else if (distanceEntered && timeInput.length() > 0) {
          timeInput.remove(timeInput.length() - 1);
          display.clearDisplay(); 
          display.setCursor(0,0);
          display.print("Enter time:");
          display.setCursor(0,10);
          display.print(timeInput); 
          display.display();
        }
      }
      else if (key1 == '=') {
        if (!distanceEntered) {
          
          num1 = distanceInput.toFloat(); 
          distanceEntered = true;
          distanceInput = ""; // Reset input for distance
          display.clearDisplay(); 
          display.setCursor(0,0);
          display.print("Enter time:");
          display.display();
        } else if (!timeEntered) {
          playairplane();
          num2 = timeInput.toFloat(); 
          timeEntered = true;
          timeInput = ""; // Reset input for time
          display.clearDisplay(); 
          display.setCursor(0,0);
          float velocity = num1 / num2; // Calculate velocity (distance / time)
          display.print("Velocity:");
          display.setCursor(0,10);
          display.print(velocity); // Display the calculated velocity
          display.display();
          break; // Exit the loop after calculating velocity
        }
      }
    }
  }
}

void distance(){
  String velocityInput = ""; // Input for velocity
  String timeInput = ""; // Input for time
  
  display.clearDisplay(); // Clear the display before starting
  
  display.setCursor(0,0);
  display.print("Enter velocity:");
  display.display();
  
  bool velocityEntered = false;
  bool timeEntered = false;

  while (!velocityEntered || !timeEntered) {
    char key1 = keypad.getKey();
    if (key1) {
      if (key1 >= '0' && key1 <= '9') {
        if (!velocityEntered) {
          velocityInput += key1;
          display.clearDisplay(); 
          display.setCursor(0,0);
          display.print("Enter velocity:");
          display.setCursor(0,10);
          display.print(velocityInput); 
          display.display();
        } else if (!timeEntered) {
          timeInput += key1;
          display.clearDisplay(); 
          display.setCursor(0,0);
          display.print("Enter time:");
          display.setCursor(0,10);
          display.print(timeInput); 
          display.display();
        }
      }
      else if (key1 == 'M') {
        if (!velocityEntered && velocityInput.length() > 0) {
          velocityInput.remove(velocityInput.length() - 1);
          display.clearDisplay(); 
          display.setCursor(0,0);
          display.print("Enter velocity:");
          display.setCursor(0,10);
          display.print(velocityInput); 
          display.display();
        } else if (velocityEntered && timeInput.length() > 0) {
          timeInput.remove(timeInput.length() - 1);
          display.clearDisplay(); 
          display.setCursor(0,0);
          display.print("Enter time:");
          display.setCursor(0,10);
          display.print(timeInput); 
          display.display();
        }
      }
      else if (key1 == '=') {
        if (!velocityEntered) {
          num1 = velocityInput.toFloat(); 
          velocityEntered = true;
          velocityInput = ""; // Reset input for velocity
          display.clearDisplay(); 
          display.setCursor(0,0);
          display.print("Enter time:");
          display.display();
        } else if (!timeEntered) {
          playairplane();
          num2 = timeInput.toFloat(); 
          timeEntered = true;
          timeInput = ""; // Reset input for time
          display.clearDisplay(); 
          display.setCursor(0,0);
          float distance = num1 * num2; // Calculate distance (velocity * time)
          display.print("Distance:");
          display.setCursor(0,10);
          display.print(distance); // Display the calculated distance
          display.display();
          break; // Exit the loop after calculating distance
        }
      }
    }
  }
}

void time(){
  String distanceInput = ""; // Input for distance
  String velocityInput = ""; // Input for velocity
  
  display.clearDisplay(); // Clear the display before starting
  
  display.setCursor(0,0);
  display.print("Enter distance:");
  display.display();
  
  bool distanceEntered = false;
  bool velocityEntered = false;

  while (!distanceEntered || !velocityEntered) {
    char key1 = keypad.getKey();
    if (key1) {
      if (key1 >= '0' && key1 <= '9') {
        if (!distanceEntered) {
          distanceInput += key1;
          display.clearDisplay(); 
          display.setCursor(0,0);
          display.print("Enter distance:");
          display.setCursor(0,10);
          display.print(distanceInput); 
          display.display();
        } else if (!velocityEntered) {
          velocityInput += key1;
          display.clearDisplay(); 
          display.setCursor(0,0);
          display.print("Enter velocity:");
          display.setCursor(0,10);
          display.print(velocityInput); 
          display.display();
        }
      }
      else if (key1 == 'M') {
        if (!distanceEntered && distanceInput.length() > 0) {
          distanceInput.remove(distanceInput.length() - 1);
          display.clearDisplay(); 
          display.setCursor(0,0);
          display.print("Enter distance:");
          display.setCursor(0,10);
          display.print(distanceInput); 
          display.display();
        } else if (distanceEntered && velocityInput.length() > 0) {
          velocityInput.remove(velocityInput.length() - 1);
          display.clearDisplay(); 
          display.setCursor(0,0);
          display.print("Enter velocity:");
          display.setCursor(0,10);
          display.print(velocityInput); 
          display.display();
        }
      }
      else if (key1 == '=') {
        if (!distanceEntered) {
          num1 = distanceInput.toFloat(); 
          distanceEntered = true;
          distanceInput = ""; // Reset input for distance
          display.clearDisplay(); 
          display.setCursor(0,0);
          display.print("Enter velocity:");
          display.display();
        } else if (!velocityEntered) {
          playairplane();
          num2 = velocityInput.toFloat(); 
          velocityEntered = true;
          velocityInput = ""; // Reset input for velocity
          display.clearDisplay(); 
          display.setCursor(0,0);
          float time = num1 / num2; // Calculate time (distance / velocity)
          display.print("Time:");
          display.setCursor(0,10);
          display.print(time); // Display the calculated time
          display.display();
          break; // Exit the loop after calculating time
        }
      }
    }
  }
}

void initial(){
  String finalVelocityInput = ""; // Input for final velocity
  String accelerationInput = ""; // Input for acceleration
  String timeInput = ""; // Input for time
  
  display.clearDisplay(); // Clear the display before starting
  
  display.setCursor(0,0);
  display.print("Enter final velocity:");
  display.display();
  
  bool finalVelocityEntered = false;
  bool accelerationEntered = false;
  bool timeEntered = false;

  while (!finalVelocityEntered || !accelerationEntered || !timeEntered) {
    char key1 = keypad.getKey();
    if (key1) {
      if (key1 >= '0' && key1 <= '9') {
        if (!finalVelocityEntered) {
          finalVelocityInput += key1;
          display.clearDisplay(); 
          display.setCursor(0,0);
          display.print("Enter final velocity:");
          display.setCursor(0,10);
          display.print(finalVelocityInput); 
          display.display();
        } else if (!accelerationEntered) {
          accelerationInput += key1;
          display.clearDisplay(); 
          display.setCursor(0,0);
          display.print("Enter acceleration:");
          display.setCursor(0,10);
          display.print(accelerationInput); 
          display.display();
        } else if (!timeEntered) {
          timeInput += key1;
          display.clearDisplay(); 
          display.setCursor(0,0);
          display.print("Enter time:");
          display.setCursor(0,10);
          display.print(timeInput); 
          display.display();
        }
      }
      else if (key1 == 'M') {
        if (!finalVelocityEntered && finalVelocityInput.length() > 0) {
          finalVelocityInput.remove(finalVelocityInput.length() - 1);
          display.clearDisplay(); 
          display.setCursor(0,0);
          display.print("Enter final velocity:");
          display.setCursor(0,10);
          display.print(finalVelocityInput); 
          display.display();
        } else if (finalVelocityEntered && accelerationInput.length() > 0) {
          accelerationInput.remove(accelerationInput.length() - 1);
          display.clearDisplay(); 
          display.setCursor(0,0);
          display.print("Enter acceleration:");
          display.setCursor(0,10);
          display.print(accelerationInput); 
          display.display();
        } else if (accelerationEntered && timeInput.length() > 0) {
          timeInput.remove(timeInput.length() - 1);
          display.clearDisplay(); 
          display.setCursor(0,0);
          display.print("Enter time:");
          display.setCursor(0,10);
          display.print(timeInput); 
          display.display();
        }
      }
      else if (key1 == '=') {
        if (!finalVelocityEntered) {
          num1 = finalVelocityInput.toFloat(); 
          finalVelocityEntered = true;
          finalVelocityInput = ""; // Reset input for final velocity
          display.clearDisplay(); 
          display.setCursor(0,0);
          display.print("Enter acceleration:");
          display.display();
        } else if (!accelerationEntered) {
          num2 = accelerationInput.toFloat(); 
          accelerationEntered = true;
          accelerationInput = ""; // Reset input for acceleration
          display.clearDisplay(); 
          display.setCursor(0,0);
          display.print("Enter time:");
          display.display();
        } else if (!timeEntered) {
          playairplane();
          num3 = timeInput.toFloat(); 
          timeEntered = true;
          timeInput = ""; // Reset input for time
          display.clearDisplay(); 
          display.setCursor(0,0);
          float initialVelocity = num1 - (num2 * num3); // Calculate initial velocity (final velocity - acceleration * time)
          display.print("Initial Velocity:");
          display.setCursor(0,10);
          display.print(initialVelocity); // Display the calculated initial velocity
          display.display();
          break; // Exit the loop after calculating initial velocity
        }
      }
    }
  }
}

void finalv(){
  String initialVelocityInput = ""; // Input for initial velocity
  String accelerationInput = ""; // Input for acceleration
  String timeInput = ""; // Input for time
  
  display.clearDisplay(); // Clear the display before starting
  
  display.setCursor(0,0);
  display.print("Enter initial velocity:");
  display.display();
  
  bool initialVelocityEntered = false;
  bool accelerationEntered = false;
  bool timeEntered = false;

  while (!initialVelocityEntered || !accelerationEntered || !timeEntered) {
    char key1 = keypad.getKey();
    if (key1) {
      if (key1 >= '0' && key1 <= '9') {
        if (!initialVelocityEntered) {
          initialVelocityInput += key1;
          display.clearDisplay(); 
          display.setCursor(0,0);
          display.print("Enter initial velocity:");
          display.setCursor(0,10);
          display.print(initialVelocityInput); 
          display.display();
        } else if (!accelerationEntered) {
          accelerationInput += key1;
          display.clearDisplay(); 
          display.setCursor(0,0);
          display.print("Enter acceleration:");
          display.setCursor(0,10);
          display.print(accelerationInput); 
          display.display();
        } else if (!timeEntered) {
          timeInput += key1;
          display.clearDisplay(); 
          display.setCursor(0,0);
          display.print("Enter time:");
          display.setCursor(0,10);
          display.print(timeInput); 
          display.display();
        }
      }
      else if (key1 == 'M') {
        if (!initialVelocityEntered && initialVelocityInput.length() > 0) {
          initialVelocityInput.remove(initialVelocityInput.length() - 1);
          display.clearDisplay(); 
          display.setCursor(0,0);
          display.print("Enter initial velocity:");
          display.setCursor(0,10);
          display.print(initialVelocityInput); 
          display.display();
        } else if (initialVelocityEntered && accelerationInput.length() > 0) {
          accelerationInput.remove(accelerationInput.length() - 1);
          display.clearDisplay(); 
          display.setCursor(0,0);
          display.print("Enter acceleration:");
          display.setCursor(0,10);
          display.print(accelerationInput); 
          display.display();
        } else if (accelerationEntered && timeInput.length() > 0) {
          timeInput.remove(timeInput.length() - 1);
          display.clearDisplay(); 
          display.setCursor(0,0);
          display.print("Enter time:");
          display.setCursor(0,10);
          display.print(timeInput); 
          display.display();
        }
      }
      else if (key1 == '=') {
        if (!initialVelocityEntered) {
          num1 = initialVelocityInput.toFloat(); 
          initialVelocityEntered = true;
          initialVelocityInput = ""; // Reset input for initial velocity
          display.clearDisplay(); 
          display.setCursor(0,0);
          display.print("Enter acceleration:");
          display.display();
        } else if (!accelerationEntered) {
          num2 = accelerationInput.toFloat(); 
          accelerationEntered = true;
          accelerationInput = ""; // Reset input for acceleration
          display.clearDisplay(); 
          display.setCursor(0,0);
          display.print("Enter time:");
          display.display();
        } else if (!timeEntered) {
          playairplane();
          num3 = timeInput.toFloat(); 
          timeEntered = true;
          timeInput = ""; // Reset input for time
          display.clearDisplay(); 
          display.setCursor(0,0);
          float finalVelocity = num1 + (num2 * num3); // Calculate final velocity (initial velocity + acceleration * time)
          display.print("Final Velocity:");
          display.setCursor(0,10);
          display.print(finalVelocity); // Display the calculated final velocity
          display.display();
          break; // Exit the loop after calculating final velocity
        }
      }
    }
  }
}

void accelerate(){
  String initialVelocityInput = ""; // Input for initial velocity
  String finalVelocityInput = ""; // Input for final velocity
  String timeInput = ""; // Input for time
  
  display.clearDisplay(); // Clear the display before starting
  
  display.setCursor(0,0);
  display.print("Enter initial velocity:");
  display.display();
  
  bool initialVelocityEntered = false;
  bool finalVelocityEntered = false;
  bool timeEntered = false;

  while (!initialVelocityEntered || !finalVelocityEntered || !timeEntered) {
    char key1 = keypad.getKey();
    if (key1) {
      if (key1 >= '0' && key1 <= '9') {
        if (!initialVelocityEntered) {
          initialVelocityInput += key1;
          display.clearDisplay(); 
          display.setCursor(0,0);
          display.print("Enter initial velocity:");
          display.setCursor(0,10);
          display.print(initialVelocityInput); 
          display.display();
        } else if (!finalVelocityEntered) {
          finalVelocityInput += key1;
          display.clearDisplay(); 
          display.setCursor(0,0);
          display.print("Enter final velocity:");
          display.setCursor(0,10);
          display.print(finalVelocityInput); 
          display.display();
        } else if (!timeEntered) {
          timeInput += key1;
          display.clearDisplay(); 
          display.setCursor(0,0);
          display.print("Enter time:");
          display.setCursor(0,10);
          display.print(timeInput); 
          display.display();
        }
      }
      else if (key1 == 'M') {
        if (!initialVelocityEntered && initialVelocityInput.length() > 0) {
          initialVelocityInput.remove(initialVelocityInput.length() - 1);
          display.clearDisplay(); 
          display.setCursor(0,0);
          display.print("Enter initial velocity:");
          display.setCursor(0,10);
          display.print(initialVelocityInput); 
          display.display();
        } else if (initialVelocityEntered && finalVelocityInput.length() > 0) {
          finalVelocityInput.remove(finalVelocityInput.length() - 1);
          display.clearDisplay(); 
          display.setCursor(0,0);
          display.print("Enter final velocity:");
          display.setCursor(0,10);
          display.print(finalVelocityInput); 
          display.display();
        } else if (finalVelocityEntered && timeInput.length() > 0) {
          timeInput.remove(timeInput.length() - 1);
          display.clearDisplay(); 
          display.setCursor(0,0);
          display.print("Enter time:");
          display.setCursor(0,10);
          display.print(timeInput); 
          display.display();
        }
      }
      else if (key1 == '=') {
        if (!initialVelocityEntered) {
          playairplane();
          num1 = initialVelocityInput.toFloat(); 
          initialVelocityEntered = true;
          initialVelocityInput = ""; // Reset input for initial velocity
          display.clearDisplay(); 
          display.setCursor(0,0);
          display.print("Enter final velocity:");
          display.display();
        } else if (!finalVelocityEntered) {
          num2 = finalVelocityInput.toFloat(); 
          finalVelocityEntered = true;
          finalVelocityInput = ""; // Reset input for final velocity
          display.clearDisplay(); 
          display.setCursor(0,0);
          display.print("Enter time:");
          display.display();
        } else if (!timeEntered) {
          playairplane();
          num3 = timeInput.toFloat(); 
          timeEntered = true;
          timeInput = ""; // Reset input for time
          display.clearDisplay(); 
          display.setCursor(0,0);
          float acceleration = (num2 - num1) / num3; // Calculate acceleration ((final velocity - initial velocity) / time)
          display.print("Acceleration:");
          display.setCursor(0,10);
          display.print(acceleration); // Display the calculated acceleration
          display.display();
          break; // Exit the loop after calculating acceleration
        }
      }
    }
  }
}

void playairplane(){
  for(int cv; cv <= 100; cv++){
  display.clearDisplay();
  display.drawBitmap(40, 8, frames[frame], FRAME_WIDTH, FRAME_HEIGHT, 1);
  display.display();
  frame = (frame + 1) % FRAME_COUNT;
  delay(FRAME_DELAY);
  }
  return;
}