ledmatrix-max7219-max7221 (community library)


Name Value
Name ledmatrix-max7219-max7221
Version 0.0.10
Installs 15678
License BSD
Author Digital Wizards Group kavik@dwgroup.cz
URL https://github.com/digitalwizards/sparkcore-ledmatrix-max7219-max7221
Repository https://github.com/digitalwizards/sparkcore-ledmatrix-max7219-max7221.git
Download .tar.gz

Library for control 8x8 LED matrices using MAX7219 / MAX7221. Uses Adafruit GFX library.

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Library Read Me

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Spark Core library for control 8x8 LED matrices using MAX7219 / MAX7221.


  • uses Adafruit_GFX library which provides basic graphics methods
    (draw/fill circles, triangles, chars, etc.)
  • allows to set transformations (rotating, mirroring) and position for each display
  • provides direct access to the whole bitmap, independent on display transformations
  • transformation buffers and flushing whole bitmap at once avoid flickering
  • possible to choose pins for CLK, CS, D_OUT (= CLK, SS, MOSI)
  • bitmaps are implemented as bit arrays for minimalizing memory usage
    (some memory has been sacrificed for trans. buffers and direct access to the unchanged bitmap)
Using with Spark WEB IDE
  1. Include library LEDMATRIX-MAX7219-MAX7221
Using with Spark Dev
  1. Create a project folder.
  2. The folder must contains ledmatrix-max7219-max7221.cpp, ledmatrix-max7219-max7221.h
    and Adafruit_GFX.cpp, Adafruit_GFX.h, glcdfont.cpp from SparkCore-Adafruit-GFX-Library
    (everything included in firmware folder).
  3. Include license.txt and text required by Adafruit GFX library.

1) Include header file:

#include "LEDMatrix.h"

2) Create instance:

// 1 display per row, 1 display per column
// optional pin settings - default: CLK = A0, CS = A1, D_OUT = A2
// (pin settings is independent on HW SPI)
LEDMatrix *led = new LEDMatrix(1, 1, A0, A1, A2);

3) Setup matrices:

// > add every matrix in the order in which they have been connected <
// the first matrix in a row, the first matrix in a column
// vertical orientation (270°) and no mirroring (x, y axes) - last three args optional
led->addMatrix(0, 0, 270, false, false);

It is possible to use almost all inhereted methods from Adafruit_GFX library:

led->fillCircle(5, 3, 2, true);

Use built-in methods:

// set intensity of the third display (0-15)
led->setIntensity(7, 2);
// invert displays
// shutdown all displays

Direct access to the bitmap:

// turn off pixel
led->bitmap->setPixel(3, 1, false);
bool val = led->bitmap->getPixel(3, 1);
led->bitmap->togglePixel(3, 1);
Bitmap changes

Pixel changes do not take effect immediately. Update displays:


You can shutdown display(s):


And free memory:

delete led;

heart.ino contains the implementation of a simple scrolling text and function for drawing a heart symbol.



Suggestions for new features, reporting bugs and other contributions will be very much appreciated!

Text required by Adafruit GFX library:
This is the core graphics library for all our displays, providing a common set of graphics primitives (points, lines, circles, etc.).  It needs to be paired with a hardware-specific library for each display device we carry (to handle the lower-level functions).

Adafruit invests time and resources providing this open source code, please support Adafruit and open-source hardware by purchasing products from Adafruit!

Written by Limor Fried/Ladyada for Adafruit Industries.
BSD license, check license.txt for more information.

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