seeed-studio / seeed_arduino_ultrathinledmatrix

an Ultrathin 32x16 LED matrix Arduino library

Ultrathin LED Matrix Library

This is an Arduino library for Ultrathin 32x16 LED Matrix.

Several panels can be combined together as a large screen.

Coordinate & Connection (Arduino -> panel 0 -> panel 1 -> ...)
  (0, 0)                                     (0, 0)
    +--------+--------+--------+               +--------+--------+
    |   5    |    4   |    3   |               |    1   |    0   |
    |        |        |        |               |        |        |<----- Arduino
    +--------+--------+--------+               +--------+--------+
    |   2    |    1   |    0   |                              (64, 16)
    |        |        |        |<----- Arduino
    +--------+--------+--------+
                            (96, 32)

Pins

• A, B, C, D - line select for two 74HC138
• OE - Ouput Enable(active low) for 74HC595
• STB - data latch for 74HC595
• CLK - shift register clock input for 74HC595

If you use the LED matrix with mbed platform, another library is for you.

Usage

#include "LEDMatrix.h"

#define WIDTH   32
#define HEIGHT  16

LEDMatrix matrix(4, 5, 6, 7, 8, 9, 10, 11);		// LEDMatrix(a, b, c, d, oe, r1, stb, clk);
uint8_t displaybuf[WIDTH *HEIGHT / 8]; 			// Display Buffer

void setup() {
    matrix.begin(displaybuf, WIDTH, HEIGHT);
}

void loop() {
    static uint32_t lastCountTime = 0;
    static uint8_t count = 0;

    matrix.scan();

    if ((millis() - lastCountTime) > 3000) {
        lastCountTime = millis();
        matrix.drawRect(count + 4, count, 28 - count, 16 - count, 1 - (count & 1));
        count = (count + 1) & 0x0F;
    }
}

---

This library is written by Yihui Xiong for seeed studio
and is licensed under The MIT License.

Contributing to this software is warmly welcomed. You can do this basically by
forking, committing modifications and then pulling requests (follow the links above
for operating guide). Adding change log and your contact into file header is encouraged.
Thanks for your contribution.

Seeed Studio is an open hardware facilitation company based in Shenzhen, China.
Benefiting from local manufacture power and convenient global logistic system,
we integrate resources to serve new era of innovation. Seeed also works with
global distributors and partners to push open hardware movement.

seeed_arduino_ultrathinledmatrix's Issues

64x16 HUB08 LED Matrix

Are these examples suitable for a 64x16 HUB08 LED Matrix?

Possible bug in scan() method

Hi,
I only have one matrix, so I mot able to test this, but reading the code of the scan() method I think there is a small bug.
This method first assigns ptr and then updates the head pointer:

    uint8_t *ptr = head;
    head += line * width * 2;

Looking at the code I think that head should be computed before assigning it to ptr:

    head += line * width * 2;
    uint8_t *ptr = head;

Sorry if I am wrong, but I cannot test it (with just one matrix, the order does not matter since this loop/code is only executed once.

Does it support esp32?

Which models of Arduino does this library support?

drawImage not working

Hi!

I have been trying to get the drawImage working and have yet to get it to do anything. The examples that come with the library don't actually seem to use anything from the library (other than to setup the screen). Is there any chance of some demo code that uses all of the commands?

Just as a thought, are there any plans to include printing characters? I was thinking 5x3, 7x5, 6x16 etc?

Many thanks and thank you for your time reading this 😁

Document LEDMatrix(a, b, c, d, oe, r1, stb, clk);

Hi,

can you add comments to what each of the parameters are in LEDMatrix, please?

LEDMatrix(a, b, c, d, oe, r1, stb, clk)

That is fairly cryptic on what each parameter (and associated pin) function is.
The only less cryptic is clk. But, still I'd like to know to what are the requirements for each pin & associated parameter.

Thx for contributing this library.