Interface LED Dot Matrix (8x8) With NodeMCU

These are the required things to do this.

Hardware Requirement

• LED Dot Matrix (8x8)
• NodeMCU
• Jumper wires / Connecting wires ( Optional )
• BreadBoard
• Micro USB Cable

Software Requirements

• Arduino IDE ( with ESP8266 library installed )

Step 2: Description

An LED Dot Matrix or LED Display is a large, low-resolution form of dot-matrix display.

It is useful for both industrial and commercial purpose, to display information as well as for hobbyist human–machine interfaces.

It consists of a 2-D diode matrix with their cathodes joined in rows and their anodes joined in columns (or vice versa).

By controlling the flow of electricity through each row and column pair it is possible to control each LED individually.

Step 3: Circuit Wiring

The Dot Matrix has 5 pins i.e.,

VCC - To be connected to NodeMCU Vin.

GND - To be connected to Ground Pin (GND) of the NodeMCU.

Din - To be connected to Digital Pin D0 of the NodeMCU.

CS - To be connected to Digital Pin D1 of the NodeMCU.

CLK - To be connected to Digital Pin D2 of the NodeMCU.

Step 4: Library Setup

Before you get started with coding you need Arduino IDE.

To download Arduino IDE and for NodeMCU setup, you can check my previous instructable. And for this Instructable you need LedControl Matrix LIbrary, you can download it from the link below.

LED Control Library

Ok, let's begin with coding.

DownloaDownload

men

Step 5: Source Code

CODE :

#include <LedControl.h>
int DIN = 16; // D0

int CS =  5;  // D1

int CLK = 4;  // D2
LedControl lc=LedControl(DIN,CLK,CS,0);
void setup(){

	lc.shutdown(0,false);     //The MAX72XX is in power-saving mode on startup

	lc.setIntensity(0,15);     // Set the brightness to maximum value

	lc.clearDisplay(0);        // and clear the display

}
void loop() {

    byte a[8] = {0xC0,0xC0,0xC0,0xC0,0xC0,0xC0,0xFF,0xFF};  // L
    byte b[8] = {0xFF,0xFF,0x18,0x18,0x18,0x18,0xFF,0xFF};     // I
    byte c[8] = {0x7F,0xFF,0xC0,0xDF,0xDF,0xC3,0x7F,0x3F};   // G
    byte d[8] = {0xC3,0xC3,0xC3,0xFF,0xFF,0xC3,0xC3,0xC3}; // H
    byte e[8] = {0xFF,0xFF,0x18,0x18,0x18,0x18,0x18,0x18};    // T
    
    byte f[8] = {0xC3,0xC3,0xC3,0xFF,0xFF,0xC3,0xC3,0xC3};  // H
    byte g[8] = {0x3C,0x7E,0xC3,0xC3,0xC3,0xC3,0x7E,0x3C}; // O
    byte h[8] = {0xC3,0xC3,0xC3,0xC3,0xC3,0xC3,0xFF,0xFF};  // U
    byte i[8] = {0x7F,0xFE,0xC0,0xFE,0x7F,0x03,0x7F,0xFE};     // S
    byte j[8] = {0xFF,0xFF,0xC0,0xF8,0xF8,0xC0,0xFF,0xFF};     // E
    printByte(a);
    delay(1000);
    printByte(b);
    delay(1000);
    printByte(c);
    delay(1000);
    printByte(d);
    delay(1000);
    printByte(e);
    delay(1000);
    printByte(f);
    delay(1000);
    printByte(g);
    delay(1000);
    printByte(h);
    delay(1000);
    printByte(i);
    delay(1000);
    printByte(j);
    delay(1000);
}
void printByte(byte character []){
  int i = 0;
  for(i=0;i<8;i++)
  {
    lc.setRow(0,i,character[i]);
  }
}

LED_DotMatrix_NodeMCU.ino" attached below.

You can tinker with the code as you wish, or use it as it is

High Quality PCBs From NEXTPCB

Nextpcb Is one of the best Online PCB manufacturing Company from where you can order PCBs online without any hassle. The company fast lead time : as fast as 24 hours. With their high tech machinery and automated work stream, they can manufacture huge quantities of high-class PCBs within hours.

Nextpcb can Develop PCBs of various complexity . They Develop simple and cheap PCBs with single layer Board For hobbyists and enthusiasts as well as complex multi layer board for high standard industrial applications NextPcb work with Large product Manufacturers And may Be the PCB of devices you are using such as laptop or smartphone were made at this factory.