Electronics Hotspot: Programmable LED MATRIX [ARDUINO]

This led matrix can be programmed using arduino, various patterns can be made using functions and by specifying the LED's on the array.

components-

transistors- BC547
Resistances- 470 ohm and 1K ohm
Arduino Uno

hookup wires

breadboard

Circuit Schematic-

Sketch-

int x [4] = {13,12,11,4}; //Pins of x axis in numerical order

int y [4] = {10,7,8,2}; //Pins of y axis in numerical order

void setup ()

{

for (int a=0; a<4; a++) { //Output pins

pinMode(x[a], OUTPUT);

}

for (int b=0; b<4; b++) { //Output pins

pinMode(y[b], OUTPUT);

}

void flash (int x1,int y1) { //Function to flash leds

x1-=1; //-1 because arrays starts with 0 so the 4 is 3 and 3 is 2...

y1-=1;

for (int c=0; c<4;c++) {

if(c!=x_){ //This will turn off every single x led except the led you wanna flash

digitalWrite(x[c], LOW);

}

for (int d=0; d<4;d++) {

if(d!=y_){ //This will turn off every single y led except the led you wanna flash

digitalWrite(y[d], LOW);

}

digitalWrite(x[(x1)],HIGH);

delay(80);

//Flashes the x led you want to

digitalWrite(y[(y1)],HIGH);

delay(80);

}

void loop () {

flash(1,1);

flash(1,2);

flash(1,3);

flash(1,4);

flash(2,1);

flash(2,2);

flash(2,3);

flash(2,4);

flash(3,1);

flash(3,2);

flash(3,3);

flash(3,4);

flash(4,1);

flash(4,2);

flash(4,3);

flash(4,4);