In this article we will look at the wemos matrix shield, we will have numerous examples using the Arduino IDE
The shield is an 8×8 LED matrix, this matrix is controlled by a TM1640. The TM1640 is a LED (Light Emitting Diode Display) drive control circuit integrating MCU digital interface, digital latch, LED high voltage drive circuit, etc
You can control the intensity of the LEDs quite easily
This is what the shield looks like
matrix led shield
Pins
The following pins are used by the shield so will be unavailable for other devices
| D1 mini | Shield |
|---|---|
| D5 | CLK |
| D7 | DIN |
Code Examples
You need to install the Matrix LED Shield Arduino Library
Example 1
[codesyntax lang=”cpp”]
//breathing matrix ???
#include <WEMOS_Matrix_LED.h>
MLED mled(0); //set intensity=0
void setup()
{
Serial.begin(115200);
for(int i=0; i<8; i++)
{
mled.disBuffer[i]=0xff; //full screen
}
}
void loop()
{
for(int i=0;i<8;i++)
{
mled.intensity=i;//change intensity
mled.display();
delay(100);
}
}
[/codesyntax]
Example 2
[codesyntax lang=”cpp”]
//draw and clear dot
#include <WEMOS_Matrix_LED.h>
MLED mled(5); //set intensity=5
void setup()
{
}
void loop()
{
for(int y=0;y<8;y++)
{
for(int x=0;x<8;x++)
{
mled.dot(x,y); // draw dot
mled.display();
delay(200);
mled.dot(x,y,0);//clear dot
mled.display();
delay(200);
}
}
}
[/codesyntax]
Example 3
[codesyntax lang=”cpp”]
//random dot
#include <WEMOS_Matrix_LED.h>
MLED mled(5); //set intensity=5
long randX;
long randY;
void setup()
{
Serial.begin(9600);
randomSeed(analogRead(A0));
}
void loop()
{
randX = random(0, 8);
randY = random(0, 8);
mled.dot(randX,randY); // draw dot
mled.display();
delay(200);
mled.dot(randX,randY,0);//clear dot
mled.display();
delay(200);
}
[/codesyntax]
Example 4
[codesyntax lang=”cpp”]
#include <WEMOS_Matrix_LED.h>
MLED mled(5); //set intensity=5
void setup()
{
}
void loop()
{
for(int y=0;y<8;y++)
{
mled.dot(3,y); // draw dot
mled.dot(4,y); // draw dot
mled.display();
}
}
[/codesyntax]
Example 5
[codesyntax lang=”cpp”]
#include <WEMOS_Matrix_LED.h>
MLED mled(5); //set intensity=5
void setup()
{
}
void loop()
{
for(int x=0;x<8;x++)
{
mled.dot(x,3); // draw dot
mled.dot(x,4); // draw dot
mled.display();
}
}
[/codesyntax]
Example 6
[codesyntax lang=”cpp”]
//box
#include <WEMOS_Matrix_LED.h>
MLED mled(5); //set intensity=5
void setup()
{
}
void loop()
{
for(int x=0;x<8;x++)
{
mled.dot(x,0); // draw dot
mled.dot(x,7); // draw dot
mled.display();
}
for(int y=0;y<8;y++)
{
mled.dot(0,y); // draw dot
mled.dot(7,y); // draw dot
mled.display();
}
}
[/codesyntax]
Example 7
[codesyntax lang=”cpp”]
#include <WEMOS_Matrix_LED.h>
MLED mled(5); //set intensity=5
void setup()
{
}
void loop()
{
for(int x=0;x<8;x++)
{
mled.dot(x,0); // draw dot
mled.dot(x,7); // draw dot
mled.display();
}
for(int y=0;y<8;y++)
{
mled.dot(0,y); // draw dot
mled.dot(7,y); // draw dot
mled.display();
}
//lets draw a dot in the middle easy way
mled.dot(3,3); // draw dot
mled.dot(3,4); // draw dot
mled.dot(4,3); // draw dot
mled.dot(4,4); // draw dot
}
[/codesyntax]
Example 8
[codesyntax lang=”cpp”]
#include <WEMOS_Matrix_LED.h>
MLED mled(5); //set intensity=5
void setup()
{
}
void loop()
{
//outside lines
for(int x=0;x<8;x++)
{
mled.dot(x,0); // draw dot
mled.dot(x,7); // draw dot
mled.display();
}
for(int y=0;y<8;y++)
{
mled.dot(0,y); // draw dot
mled.dot(7,y); // draw dot
mled.display();
}
//inside lines
delay(500);
for(int x=1;x<7;x++)
{
mled.dot(x,1); // draw dot
mled.dot(x,6); // draw dot
mled.display();
}
for(int y=1;y<7;y++)
{
mled.dot(1,y); // draw dot
mled.dot(6,y); // draw dot
mled.display();
}
//inside lines 2
delay(500);
for(int x=2;x<6;x++)
{
mled.dot(x,2); // draw dot
mled.dot(x,5); // draw dot
mled.display();
}
for(int y=2;y<6;y++)
{
mled.dot(2,y); // draw dot
mled.dot(5,y); // draw dot
mled.display();
}
delay(500);
//lets draw a dot in the middle easy way
mled.dot(3,3); // draw dot
mled.dot(3,4); // draw dot
mled.dot(4,3); // draw dot
mled.dot(4,4); // draw dot
mled.display();
delay(2000);
for(int y=0;y<8;y++)
{
for(int x=0;x<8;x++)
{
mled.dot(x,y,0);//clear dot
mled.display();
}
}
}
[/codesyntax]
Video
This is a video of the examples above
Links
Matrix LED Shield V1.0.0 8 Step Adjustable Intensity for WEMOS D1 mini V1.0 8×8