the-elevator-project/led_matrix.ino

#include "LedControl.h"
/*
 pin 12 is connected to the DataIn 
 pin 11 is connected to LOAD(CS)
 pin 10 is connected to the CLK 
 */
LedControl lc=LedControl(12,10,11,1);

// web url to make the matrices
// https://xantorohara.github.io/led-matrix-editor/#18181899db7e3c18|18181899db7e3c18|0018181899db7e3c|000018181899db7e|00000018181899db|0000000018181899|1800000000181818|3c18000000001818|7e3c180000000018|db7e3c1800000000|99db7e3c18000000|1899db7e3c180000|181899db7e3c1800|18181899db7e3c18

const uint64_t UPARROW[] = {
  0x18181899db7e3c18,0x0018181899db7e3c,0x000018181899db7e,0x00000018181899db,
  0x0000000018181899,0x1800000000181818,0x3c18000000001818,0x7e3c180000000018,
  0xdb7e3c1800000000,0x99db7e3c18000000,0x1899db7e3c180000,0x181899db7e3c1800
};

const uint64_t DOWNARROW[] = {
  0x183c7edb99181818,0x3c7edb9918181800,0x7edb991818180000,0xdb99181818000000,
  0x9918181800000000,0x1818180000000018,0x181800000000183c,0x1800000000183c7e,
  0x00000000183c7edb,0x000000183c7edb99,0x0000183c7edb9918,0x00183c7edb991818
};

const uint64_t ATTHETOP[] = {
  0x1899db7e3c1800ff
};

const uint64_t ATTHEBOTTOM[] = {
  0xff00183c7edb9918
};

const uint64_t HELPBUTTON[] = {
  0x18ff814242423c18
};

const int UPARROW_LEN = sizeof(UPARROW)/8;
const int DOWNARROW_LEN = sizeof(DOWNARROW)/8;
const int ATTHEBOTTOM_LEN = sizeof(ATTHEBOTTOM)/8;
const int ATTHETOP_LEN = sizeof(ATTHETOP)/8;
const int HELPBUTTON_LEN = sizeof(HELPBUTTON)/8;
int i = 0;
int RX_data=0;
bool goingup, goingdown, atthetop, atthebottom, helpbutton = false;
int topbottomtimer = 0;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  lc.shutdown(0,true);
  /* Set the brightness to a medium values */
  lc.setIntensity(0,0);
  /* and clear the display */
  lc.clearDisplay(0);
}

void loop() {
  // let's read the serial port first to see what action we need to take.
  if(Serial.available()) 
  {
    RX_data = Serial.read(); 
  }
 
  // now we take that data and make our decisions
  if(RX_data == '1') // elevator going down is 1
  {
    goingup = false;
    goingdown = true;    
  }
  else if(RX_data == '2') // elevator going up is 2
  {    
    goingdown = false;
    goingup = true;
  }
  else if(RX_data == '3') // elevator stopped is 3
  {
    goingup = false;
    goingdown = false;
    atthebottom = false;
    atthetop = false;  
  }
  else if(RX_data == '4') // elevator has reached the top
  {
    goingup = false;
    goingdown = false;
    atthebottom = false;
    atthetop = true;
  }
  else if(RX_data == '5') // elevator is at the bottom
  {
    goingup = false;
    goingdown = false;
    atthetop = false;
    atthebottom = true;
  }
  // for the help button, we only change its status, so when it is pressed/unpressed
  // whatever action was happening before will continue
  else if(RX_data == '6') // someone pressed the help button
  {
    helpbutton = true;
  }
  else if (RX_data == '7') // the help button is not pressed anymore
  {
    helpbutton = false;
  }

  if (atthetop || atthebottom)
  {    
    if (topbottomtimer <= 100)
    {
      topbottomtimer++;
    }
  }

  // now that we've set the application state based on the serial input, make the LEDs happen!
  if (helpbutton)
  {
    lc.shutdown(0,false);
    displayImage(HELPBUTTON[i]);
    if (++i >= HELPBUTTON_LEN ) 
    {
      i = 0;
    }
    delay(100);   
  }
  else if (goingup)
  {
    lc.shutdown(0,false);
    displayImage(UPARROW[i]);
    if (++i >= UPARROW_LEN ) 
    {
      i = 0;
    }
    delay(100);
    topbottomtimer = 0;
  }
  else if (goingdown)
  {
    lc.shutdown(0,false);
    displayImage(DOWNARROW[i]);
    if (++i >= DOWNARROW_LEN ) 
    {
      i = 0;
    }
    delay(100);
    topbottomtimer = 0; 
  }
  else if (atthetop && topbottomtimer < 100)
  {
    lc.shutdown(0,false);
    displayImage(ATTHETOP[i]);
    if (++i >= ATTHETOP_LEN ) 
    {
      i = 0;
    }
    delay(100);
  }
  else if (atthebottom && topbottomtimer < 100)
  {
    lc.shutdown(0,false);
    displayImage(ATTHEBOTTOM[i]);
    if (++i >= ATTHEBOTTOM_LEN ) 
    {
      i = 0;
    }
    delay(100);     
  }
  // otherwise, turn off the display to save energy
  else
  {
    lc.clearDisplay(0);
    lc.shutdown(0,true);
  }
}

void displayImage(uint64_t image) {
  for (int i = 0; i < 8; i++) {
    byte row = (image >> i * 8) & 0xFF;
    for (int j = 0; j < 8; j++) {
      lc.setLed(0, i, j, bitRead(row, j));
    }
  }
}