Multidimensional Array Charlieplexing 90 LEDs (10 pins)

knight100 · January 17, 2021, 8:08am

Hi,

I would like to make a multidimensional array of 10 rows * 9 columns for Charlieplexing 90 LEDs. The array represents the positions of the LEDs.

LED00 LED01 LED02 LED03 LED04 LED05 LED06 LED07 LED08

LED10 LED11 LED12 LED13 LED14 LED15 LED16 LED17 LED18

LED20 LED21 LED22 LED23 LED24 LED25 LED26 LED27 LED28

LED30 LED31 LED32 LED33 LED34 LED35 LED36 LED37 LED38

LED40 LED41 LED42 LED43 LED44 LED45 LED46 LED47 LED48

LED50 LED51 LED52 LED53 LED54 LED55 LED56 LED57 LED58

LED60 LED61 LED62 LED63 LED64 LED65 LED66 LED67 LED68

LED70 LED71 LED72 LED73 LED74 LED75 LED76 LED77 LED78

LED80 LED81 LED82 LED83 LED84 LED85 LED86 LED87 LED88

LED90 LED91 LED92 LED93 LED94 LED95 LED96 LED97 LED98

Below is my code.

int Pin1 = 2;
int Pin2= 3;
int Pin3 = 4;
int Pin4 = 5;
int Pin5 = 6;
int Pin6 = 7;
int Pin7 = 8;
int Pin8 = 9;
int Pin9 = 10;
int Pin10 = 11;
int a = 0;
int b = 0;
int LEDNumber [10][10];


void setup() 
{
  
}


void OnLED (LEDNumber[a][b])
{
  if (a == 0)
  {
    pinMode(Pin1, OUTPUT);
    digitalWrite (Pin1, LOW);
    if (b == 0)
    {
      pinMode(Pin2, OUTPUT);
      pinMode(Pin3, INPUT);
      pinMode(Pin4, INPUT);
      pinMode(Pin5, INPUT);
      pinMode(Pin6, INPUT);
      pinMode(Pin7, INPUT);
      pinMode(Pin8, INPUT);
      pinMode(Pin9, INPUT);
      pinMode(Pin10, INPUT);
      digitalWrite (Pin2, HIGH);
    }
  }
}


void loop() 
{
  OnLED ([0][0]);
  delay(50);
}

The compiler stuck at void OnLED (LEDNumber[a]), it says error: variable or field 'OnLED' declared void
I have made Instructables.com for the project, may have a look.
Thanks for your help in advance.
https://www.instructables.com/Charlieplexing-90-LEDs-10-Pins/

UKHeliBob · January 17, 2021, 8:27am

Try this
Untested beyond compiling

int Pin1 = 2;
int Pin2 = 3;
int Pin3 = 4;
int Pin4 = 5;
int Pin5 = 6;
int Pin6 = 7;
int Pin7 = 8;
int Pin8 = 9;
int Pin9 = 10;
int Pin10 = 11;
int a = 0;
int b = 0;
int LEDNumber [10][10];


void setup()
{
}

void OnLED (byte a, byte b)
{
  if (a == 0)
  {
    pinMode(Pin1, OUTPUT);
    digitalWrite (Pin1, LOW);
    if (b == 0)
    {
      pinMode(Pin2, OUTPUT);
      pinMode(Pin3, INPUT);
      pinMode(Pin4, INPUT);
      pinMode(Pin5, INPUT);
      pinMode(Pin6, INPUT);
      pinMode(Pin7, INPUT);
      pinMode(Pin8, INPUT);
      pinMode(Pin9, INPUT);
      pinMode(Pin10, INPUT);
      digitalWrite (Pin2, HIGH);
    }
  }
}


void loop()
{
  OnLED (0, 0);
  delay(50);
}

knight100 · January 17, 2021, 8:32am

Thank you
UKHeliBob

It managed to compile. The PCB boards have not come. Yet tested.

UKHeliBob · January 17, 2021, 8:45am

Do you understand what was wrong ?

gcjr · January 17, 2021, 10:43am

don't you want something like following? (compiles, untested)
not sure how you determine which LEDs are active

byte rowPins [] = { 3, 4, 5, 6 };
byte colPins [] = { 7, 8, 9, 10, 11 };
#define N_ROW      sizeof(rowPins)
#define N_COL      sizeof(colPins)

byte ledState [N_COL][N_ROW] = {};  // 0 == LOW == Off

// -----------------------------------------------------------------------------
void setup()
{
    for (unsigned i = 0; i < N_ROW; i++)
        pinMode (rowPins [i], OUTPUT);

    for (unsigned i = 0; i < N_COL; i++)
        pinMode (colPins [i], INPUT);
}

// -----------------------------------------------------------------------------
// LEDs are On when row pin is HIGH and
// col pin is configured as an OUTPUT and LOW
// allowing current to flow from row to col pin.
// LED is Off when col pin is configure as INPUT.

void refresh (void)
{
    for (unsigned col = 0; col < N_COL; col++)  {
        digitalWrite (colPins [col], LOW);      // set LOW to sink current
        pinMode (colPins [col], OUTPUT);

        for (unsigned row = 0; row < N_ROW; row++)
            digitalWrite (rowPins [row], ledState [row][col]);

        pinMode (colPins [col], INPUT);         // removes sink

#define REFRESH_DELAY   10
        delay (REFRESH_DELAY);
    } 
}

// -----------------------------------------------------------------------------
void setLed (
    byte    state,
    int     col,
    int     row )
{
    ledState [row][col] = state;
}

// -----------------------------------------------------------------------------
void
routineSettingLedsOnOff (void)
{
    // ???
}

// -----------------------------------------------------------------------------
void loop()
{
    refresh ();
    routineSettingLedsOnOff ();
}

MarkT · January 17, 2021, 12:36pm

Why not lose all the duplication of this:

int Pin1 = 2;
int Pin2= 3;
int Pin3 = 4;
int Pin4 = 5;
int Pin5 = 6;
int Pin6 = 7;
int Pin7 = 8;
int Pin8 = 9;
int Pin9 = 10;
int Pin10 = 11;

and make it nice and succinct with an array:

byte pins [10] = {2,3,4,5,6,7,8,9,10,11} ;

You only need a byte for a pin number. Similarly the array of LED states may only need to be
of type boolean.

knight100 · January 17, 2021, 1:30pm

Pin 1
Pin 2
Pin 3
Pin 4
Pin 5
Pin 6
Pin 7
Pin 8
Pin 9
Pin 10
LED No.

0	1	INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	LED00
0	INPUT	1	INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	LED01
0	INPUT	INPUT	1	INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	LED02
0	INPUT	INPUT	INPUT	1	INPUT	INPUT	INPUT	INPUT	INPUT	LED03
0	INPUT	INPUT	INPUT	INPUT	1	INPUT	INPUT	INPUT	INPUT	LED04
0	INPUT	INPUT	INPUT	INPUT	INPUT	1	INPUT	INPUT	INPUT	LED05
0	INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	1	INPUT	INPUT	LED06
0	INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	1	INPUT	LED07
0	INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	1	LED08
INPUT	0	1	INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	LED10
INPUT	0	INPUT	1	INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	LED11
INPUT	0	INPUT	INPUT	1	INPUT	INPUT	INPUT	INPUT	INPUT	LED12
INPUT	0	INPUT	INPUT	INPUT	1	INPUT	INPUT	INPUT	INPUT	LED13
INPUT	0	INPUT	INPUT	INPUT	INPUT	1	INPUT	INPUT	INPUT	LED14
INPUT	0	INPUT	INPUT	INPUT	INPUT	INPUT	1	INPUT	INPUT	LED15
INPUT	0	INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	1	INPUT	LED16
INPUT	0	INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	1	LED17
1	0	INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	LED18
INPUT	INPUT	0	1	INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	LED20
INPUT	INPUT	0	INPUT	1	INPUT	INPUT	INPUT	INPUT	INPUT	LED21
INPUT	INPUT	0	INPUT	INPUT	1	INPUT	INPUT	INPUT	INPUT	LED22
INPUT	INPUT	0	INPUT	INPUT	INPUT	1	INPUT	INPUT	INPUT	LED23
INPUT	INPUT	0	INPUT	INPUT	INPUT	INPUT	1	INPUT	INPUT	LED24
INPUT	INPUT	0	INPUT	INPUT	INPUT	INPUT	INPUT	1	INPUT	LED25
INPUT	INPUT	0	INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	1	LED26
1	INPUT	0	INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	LED27
INPUT	1	0	INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	LED28
INPUT	INPUT	INPUT	0	1	INPUT	INPUT	INPUT	INPUT	INPUT	LED30
INPUT	INPUT	INPUT	0	INPUT	1	INPUT	INPUT	INPUT	INPUT	LED31
INPUT	INPUT	INPUT	0	INPUT	INPUT	1	INPUT	INPUT	INPUT	LED32
INPUT	INPUT	INPUT	0	INPUT	INPUT	INPUT	1	INPUT	INPUT	LED33
INPUT	INPUT	INPUT	0	INPUT	INPUT	INPUT	INPUT	1	INPUT	LED34
INPUT	INPUT	INPUT	0	INPUT	INPUT	INPUT	INPUT	INPUT	1	LED35
1	INPUT	INPUT	0	INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	LED36
INPUT	1	INPUT	0	INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	LED37
INPUT	INPUT	1	0	INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	LED38
INPUT	INPUT	INPUT	INPUT	0	1	INPUT	INPUT	INPUT	INPUT	LED40
INPUT	INPUT	INPUT	INPUT	0	INPUT	1	INPUT	INPUT	INPUT	LED41
INPUT	INPUT	INPUT	INPUT	0	INPUT	INPUT	1	INPUT	INPUT	LED42
INPUT	INPUT	INPUT	INPUT	0	INPUT	INPUT	INPUT	1	INPUT	LED43
INPUT	INPUT	INPUT	INPUT	0	INPUT	INPUT	INPUT	INPUT	1	LED44
1	INPUT	INPUT	INPUT	0	INPUT	INPUT	INPUT	INPUT	INPUT	LED45
INPUT	1	INPUT	INPUT	0	INPUT	INPUT	INPUT	INPUT	INPUT	LED46
INPUT	INPUT	1	INPUT	0	INPUT	INPUT	INPUT	INPUT	INPUT	LED47
INPUT	INPUT	INPUT	1	0	INPUT	INPUT	INPUT	INPUT	INPUT	LED48

knight100 · January 17, 2021, 1:36pm

Pin 1
Pin 2
Pin 3
Pin 4
Pin 5
Pin 6
Pin 7
Pin 8
Pin 9
Pin 10
LED No.

INPUT	INPUT	INPUT	INPUT	INPUT	0	1	INPUT	INPUT	INPUT	LED50
INPUT	INPUT	INPUT	INPUT	INPUT	0	INPUT	1	INPUT	INPUT	LED51
INPUT	INPUT	INPUT	INPUT	INPUT	0	INPUT	INPUT	1	INPUT	LED52
INPUT	INPUT	INPUT	INPUT	INPUT	0	INPUT	INPUT	INPUT	1	LED53
1	INPUT	INPUT	INPUT	INPUT	0	INPUT	INPUT	INPUT	INPUT	LED54
INPUT	1	INPUT	INPUT	INPUT	0	INPUT	INPUT	INPUT	INPUT	LED55
INPUT	INPUT	1	INPUT	INPUT	0	INPUT	INPUT	INPUT	INPUT	LED56
INPUT	INPUT	INPUT	1	INPUT	0	INPUT	INPUT	INPUT	INPUT	LED57
INPUT	INPUT	INPUT	INPUT	1	0	INPUT	INPUT	INPUT	INPUT	LED58
INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	0	1	INPUT	INPUT	LED60
INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	0	INPUT	1	INPUT	LED61
INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	0	INPUT	INPUT	1	LED62
1	INPUT	INPUT	INPUT	INPUT	INPUT	0	INPUT	INPUT	INPUT	LED63
INPUT	1	INPUT	INPUT	INPUT	INPUT	0	INPUT	INPUT	INPUT	LED64
INPUT	INPUT	1	INPUT	INPUT	INPUT	0	INPUT	INPUT	INPUT	LED65
INPUT	INPUT	INPUT	1	INPUT	INPUT	0	INPUT	INPUT	INPUT	LED66
INPUT	INPUT	INPUT	INPUT	1	INPUT	0	INPUT	INPUT	INPUT	LED67
INPUT	INPUT	INPUT	INPUT	INPUT	1	0	INPUT	INPUT	INPUT	LED68
INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	0	1	INPUT	LED70
INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	0	INPUT	1	LED71
1	INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	0	INPUT	INPUT	LED72
INPUT	1	INPUT	INPUT	INPUT	INPUT	INPUT	0	INPUT	INPUT	LED73
INPUT	INPUT	1	INPUT	INPUT	INPUT	INPUT	0	INPUT	INPUT	LED74
INPUT	INPUT	INPUT	1	INPUT	INPUT	INPUT	0	INPUT	INPUT	LED75
INPUT	INPUT	INPUT	INPUT	1	INPUT	INPUT	0	INPUT	INPUT	LED76
INPUT	INPUT	INPUT	INPUT	INPUT	1	INPUT	0	INPUT	INPUT	LED77
INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	1	0	INPUT	INPUT	LED78
INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	0	1	LED80
1	INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	0	INPUT	LED81
INPUT	1	INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	0	INPUT	LED82
INPUT	INPUT	1	INPUT	INPUT	INPUT	INPUT	INPUT	0	INPUT	LED83
INPUT	INPUT	INPUT	1	INPUT	INPUT	INPUT	INPUT	0	INPUT	LED84
INPUT	INPUT	INPUT	INPUT	1	INPUT	INPUT	INPUT	0	INPUT	LED85
INPUT	INPUT	INPUT	INPUT	INPUT	1	INPUT	INPUT	0	INPUT	LED86
INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	1	INPUT	0	INPUT	LED87
INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	1	0	INPUT	LED88
1	INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	0	LED90
INPUT	1	INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	0	LED91
INPUT	INPUT	1	INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	0	LED92
INPUT	INPUT	INPUT	1	INPUT	INPUT	INPUT	INPUT	INPUT	0	LED93
INPUT	INPUT	INPUT	INPUT	1	INPUT	INPUT	INPUT	INPUT	0	LED94
INPUT	INPUT	INPUT	INPUT	INPUT	1	INPUT	INPUT	INPUT	0	LED95
INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	1	INPUT	INPUT	0	LED96
INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	1	INPUT	0	LED97
INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	INPUT	1	0	LED98

knight100 · January 17, 2021, 1:46pm

Hey all,

I would like to blink every single LED and create patterns.
Please have a look at the truth table.

For example. LED 00 to LED 08, the common ground pin is 1.
LED 10 to LED 18, the common ground pin is 2.
LED 20 to LED 28, the common ground pin is 3.

LED 30 to LED 38, the common ground pin is 4.

LED 40 to LED 48, the common ground pin is 5.

LED 50 to LED 58, the common ground pin is 6.

LED 60 to LED 68, the common ground pin is 7.

LED 70 to LED 78, the common ground pin is 8.

LED 80 to LED 88, the common ground pin is 9.

LED 90 to LED 98, the common ground pin is 10.

The high pins vary with the LED number.
Attached is the truth table.

Thanks in advance.

knight100 · January 17, 2021, 1:52pm

Hey,

Attached is the truth table.

Charlieplexing 90 LEDs.pdf (156 KB)

knight100 · January 21, 2021, 9:50am

Hey,

Just an update. Here is my sample code, can you please suggest to me how to simplify this code, especially the pins? Thanks in advance.

int Pin0 = 2;
int Pin1 = 3;
int Pin2 = 4;
int Pin3 = 5;
int Pin4 = 6;
int Pin5 = 7;
int Pin6 = 8;
int Pin7 = 9;
int Pin8 = 10;
int Pin9 = 11;

void setup()
{
}

void OnLED (int a, int b)
{
  if (a == 0)
  {
    pinMode(Pin0, OUTPUT);
    digitalWrite (Pin0, HIGH);
    if (b == 0)
    {
      pinMode(Pin0, OUTPUT);
      pinMode(Pin1, OUTPUT);
      pinMode(Pin2, INPUT);
      pinMode(Pin3, INPUT);
      pinMode(Pin4, INPUT);
      pinMode(Pin5, INPUT);
      pinMode(Pin6, INPUT);
      pinMode(Pin7, INPUT);
      pinMode(Pin8, INPUT);
      pinMode(Pin9, INPUT);
      digitalWrite (Pin1, LOW);
    }
    if (b == 1)
    {
      pinMode(Pin0, OUTPUT);
      pinMode(Pin1, INPUT);
      pinMode(Pin2, OUTPUT);
      pinMode(Pin3, INPUT);
      pinMode(Pin4, INPUT);
      pinMode(Pin5, INPUT);
      pinMode(Pin6, INPUT);
      pinMode(Pin7, INPUT);
      pinMode(Pin8, INPUT);
      pinMode(Pin9, INPUT);
      digitalWrite (Pin2, LOW);
    }
    if (b == 2)
    {
      pinMode(Pin0, OUTPUT);
      pinMode(Pin1, INPUT);
      pinMode(Pin2, INPUT);
      pinMode(Pin3, OUTPUT);
      pinMode(Pin4, INPUT);
      pinMode(Pin5, INPUT);
      pinMode(Pin6, INPUT);
      pinMode(Pin7, INPUT);
      pinMode(Pin8, INPUT);
      pinMode(Pin9, INPUT);
      digitalWrite (Pin3, LOW);
    }
    if (b == 3)
    {
      pinMode(Pin0, OUTPUT);
      pinMode(Pin1, INPUT);
      pinMode(Pin2, INPUT);
      pinMode(Pin3, INPUT);
      pinMode(Pin4, OUTPUT);
      pinMode(Pin5, INPUT);
      pinMode(Pin6, INPUT);
      pinMode(Pin7, INPUT);
      pinMode(Pin8, INPUT);
      pinMode(Pin9, INPUT);
      digitalWrite (Pin4, LOW);
    }
    if (b == 4)
    {
      pinMode(Pin0, OUTPUT);
      pinMode(Pin1, INPUT);
      pinMode(Pin2, INPUT);
      pinMode(Pin3, INPUT);
      pinMode(Pin4, INPUT);
      pinMode(Pin5, OUTPUT);
      pinMode(Pin6, INPUT);
      pinMode(Pin7, INPUT);
      pinMode(Pin8, INPUT);
      pinMode(Pin9, INPUT);
      digitalWrite (Pin5, LOW);
    }
    if (b == 5)
    {
      pinMode(Pin0, OUTPUT);
      pinMode(Pin1, INPUT);
      pinMode(Pin2, INPUT);
      pinMode(Pin3, INPUT);
      pinMode(Pin4, INPUT);
      pinMode(Pin5, INPUT);
      pinMode(Pin6, OUTPUT);
      pinMode(Pin7, INPUT);
      pinMode(Pin8, INPUT);
      pinMode(Pin9, INPUT);
      digitalWrite (Pin6, LOW);
    }
    if (b == 6)
    {
      pinMode(Pin0, OUTPUT);
      pinMode(Pin1, INPUT);
      pinMode(Pin2, INPUT);
      pinMode(Pin3, INPUT);
      pinMode(Pin4, INPUT);
      pinMode(Pin5, INPUT);
      pinMode(Pin6, INPUT);
      pinMode(Pin7, OUTPUT);
      pinMode(Pin8, INPUT);
      pinMode(Pin9, INPUT);
      digitalWrite (Pin7, LOW);
    }
    if (b == 7)
    {
      pinMode(Pin0, OUTPUT);
      pinMode(Pin1, INPUT);
      pinMode(Pin2, INPUT);
      pinMode(Pin3, INPUT);
      pinMode(Pin4, INPUT);
      pinMode(Pin5, INPUT);
      pinMode(Pin6, INPUT);
      pinMode(Pin7, INPUT);
      pinMode(Pin8, OUTPUT);
      pinMode(Pin9, INPUT);
      digitalWrite (Pin8, LOW);
    }
    if (b == 8)
    {
      pinMode(Pin0, OUTPUT);
      pinMode(Pin1, INPUT);
      pinMode(Pin2, INPUT);
      pinMode(Pin3, INPUT);
      pinMode(Pin4, INPUT);
      pinMode(Pin5, INPUT);
      pinMode(Pin6, INPUT);
      pinMode(Pin7, INPUT);
      pinMode(Pin8, INPUT);
      pinMode(Pin9, OUTPUT);
      digitalWrite (Pin9, LOW);
    }
  }
}

void loop()
{
  for (a = 0; a < 9; a++)
  {
    for (b = 0; b < 8; b++)
    {
      OnLED (a, b);
      delay(100); 
    }
    for (b = 0; b < 8; b++)
    {
      OnLED (a, b);
      delay(100); 
    }
    for (b = 0; b < 8; b++)
    {
      OnLED (a, b);
      delay(100); 
    }
    for (b = 0; b < 8; b++)
    {
      OnLED (a, b);
      delay(100); 
    }
    for (b = 0; b < 8; b++)
    {
      OnLED (a, b);
      delay(100); 
    }
    for (b = 0; b < 8; b++)
    {
      OnLED (a, b);
      delay(100); 
    }
    for (b = 0; b < 8; b++)
    {
      OnLED (a, b);
      delay(100); 
    }
    for (b = 0; b < 8; b++)
    {
      OnLED (a, b);
      delay(100); 
    }
    for (b = 0; b < 8; b++)
    {
      OnLED (a, b);
      delay(100); 
    }
    for (b = 0; b < 8; b++)
    {
      OnLED (a, b);
      delay(100); 
    }
  }
}

Charlieplexing_90_LEDs_inverted.ino (33.2 KB)

knight100 · January 21, 2021, 9:58am

Here is my updated truth table. The pins start from pin 0.

Charlieplexing 90 LEDs.pdf (156 KB)

UKHeliBob · January 21, 2021, 10:18am

Start by putting the pin numbers in an array. Then create a 2 dimensional array with the row being the value of a and the columns being the required value (HIGH, or LOW) for the pins associated with the value of a

Then, given the value of a you can select a row in the array and iterate through the values in that row setting the LED states as appropriate

A further refinement would be not to store HIGH/LOW in the second array but to use the bit values in an int variable in a simple array indexed by the value of a, but I suggest that you do it the other way first

system · May 21, 2021, 10:18am

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Multidimensional Array Charlieplexing 90 LEDs (10 pins)

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