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.

Lets Make it

Working and Making Video

Time needed: 4 hours.

Steps to Build the 8 x 8 LED Matrix FreeForm Display

  1. Extracting the Copper Wires

    I extracted the Copper Wires from an old Ethernet Cable. Usually Cat 5 / 6 will have Copper Wires of 24AWG to 28AWG. You can also buy from local electrical store but as these are non insulated it is difficult to find. 24AWG Non-Insulated Copper Wire

  2. Soldering Setup

    The wires need to be soldered to the ICs and for a good shiny solder, the ICs need to properly hold in place. I was not having a third helping hand so I made my own. I Used a C-Clamp with a Twizzer to hold the IC in Place.DIY Third Hand for Electronics Soldering

  3. Plan the Routing of Wires

    Start with one Component and keep adding the other Components to it you will naturally get ideas how to route the wires and will end up into a beautiful design. [ Schematic is provided below ]FreeForm Circuit Design Circuit Sculpture

  4. Flash the Code in the Arduino

    The last component I added to the circuit was the Arduino Nano. I used Arduino Nano as it kept the form factor small and it is cheap. [ Code is Provided Below ]Arduino Circuit Sculpture / FreeForm Circuit

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);
}


Schematics

Schematics Arduino 8x8 LED Matrix ULN2803APG 74HC595N
Schematics Arduino 8×8 LED Matrix ULN2803APG 74HC595N

Download Project


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