/*
  LED bar graph for K.I.T.T. (Knight Rider)
  20231116 by Luis Mateo

  https://wokwi.com/arduino/projects/30982948935901570

  This example code is in the public domain.
  References:
  https://playground.arduino.cc/Code/BitMath/

*/


// Constants
const int lampCount = 10;
int lampPin[] = {2, 3, 4, 5, 6, 7, 8, 9, 10, 11};

// Lamp lighting table
// Caveat: #elements = sizeof(myarray)/sizeof(int);
const int barLength = 12; 
int barStatus[] = {
0b0000000000,
0b0000000001,
0b0000000011,
0b0000000111,
0b0000001110,
0b0000011100,
0b0000111000,
0b0001110000,
0b0011100000,
0b0111000000,
0b1100000000,
0b1000000000
};

bool goingup
; //true means go up
int count;

void setup() {
  goingup = true;
  for (int i = 0; i < lampCount; i++) {
    pinMode(lampPin[i], OUTPUT);
  }
}

void loop() {
  Show(count);
  if (goingup) count++; else count--; // next step
  if (goingup) 
    if (barLength == count) {
      goingup = false;
      count--; // avoid matrix limits
    }

  else
    if (0 == count) 
      goingup = true;
  delay(1000);
}

void Show(int cnt) {
  for (int p = 0; p < lampCount; p++) {
    digitalWrite(lampPin[p], bitRead(barStatus[cnt], p));
  }
}