Arduino 8×8 LED Matrix FreeForm Circuit Design | ULN2803APG | 74HC595N

Introduction : Arduino 8×8 LED Matrix FreeForm Circuit Design | ULN2803APG | 74HC595N

This Project is a different and unique as it uses FreeForm Circuit Design / Circuit Sculpturing i.e. Circuit Design without the use of any PCB. The LED Matrix Displays patterns/frames saved in the memory of Arduino UNO. [ You can download the complete Project at the end ]

Project BOM

Click on Each Product Below and You will be Taken to the Product Page that I trust and have used in my Project. I Highly Recommend You Buy Directly from the Link Below or Add to Cart.

• Arduino Nano as the Microcontroller
• ULN2803APG as the Darlington Pair Current Sink
• 74HC595N as the Shift Register
• 8 X 8 LED Matrix [ Common Cathode ]
• Non-Insulated Copper / Brass Wire of 22AWG

Lets Make it

Arduino IDE Source Code

//
// Code is Provided by www.ArnabKumarDas.com
// Code should not be used for System Crticial Application which may lead to loss of life
// Code is for Demostraction or POC Purpose Not for Production
//
const byte IMAGES[][8] = {
  {
    B11111111,
    B10000001,
    B10000001,
    B10000001,
    B10000001,
    B10000001,
    B10000001,
    B11111111
  }, {
    B11111111,
    B10000001,
    B10000001,
    B10000001,
    B10000001,
    B10000001,
    B10000001,
    B11111111
  }
};
const int IMAGES_LEN = sizeof(IMAGES) / 8;

uint8_t colPins[8] = { 2, 3, 4, 5, 6, 7, 8, 9};

#define SCK_PIN 10
#define RCK_PIN 11
#define SER_PIN 12

void setup() {
  // Turn everything to low
  for (int i = 0; i < 8; i++) {
    pinMode(colPins[i], OUTPUT);
  }
  pinMode(SER_PIN, OUTPUT);
  pinMode(SCK_PIN, OUTPUT);
  pinMode(RCK_PIN, OUTPUT);
  Serial.begin(9600);
}

void loop()
{
  for ( int i = 0; i < IMAGES_LEN; i++)
  {
    for (int j = 0; j < 20 ; j++)
    {
      for (int column = 0; column < 8; column++)
      {
        digitalWrite(colPins[column], HIGH);  //columnbits & (1 << column) ? HIGH : LOW);
        write595(IMAGES[i][column] << 4 | IMAGES[i][column] >> 4 ); // prepare to write the row
        delay(1);
        write595(0);
        for (int k = 0; k < 8; k++)
          digitalWrite(colPins[k], LOW); // Cleanup cols
      }
    }
  }
}

void write595(byte data)
{
  digitalWrite(RCK_PIN, LOW);
  shiftOut(SER_PIN, SCK_PIN, MSBFIRST, data);
  digitalWrite(RCK_PIN, HIGH);
}

 

Schematic

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Download Project