Cascading Matrices #37
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Thanks @FlantasticDan for all of your work on this. I have hardware on the way to test this out hopefully within a week or two. |
FoamyGuy
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Dec 15, 2021
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Thanks for working on this @FlantasticDan
multi_max7219.mp4
These changes look good to me. Tested successfully on
Adafruit CircuitPython 7.2.0-alpha.0 on 2021-12-03; Adafruit Feather RP2040 with rp2040
Board ID:adafruit_feather_rp2040
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Updating https://github.com/adafruit/Adafruit_CircuitPython_MAX7219 to 1.5.0 from 1.4.1: > Merge pull request adafruit/Adafruit_CircuitPython_MAX7219#37 from FlantasticDan/chainable-matrices > update rtd py version Updating https://github.com/adafruit/Adafruit_CircuitPython_PyBadger to 3.6.1 from 3.6.0: > Merge pull request adafruit/Adafruit_CircuitPython_PyBadger#56 from FoamyGuy/rename_mag_tag > Merge pull request adafruit/Adafruit_CircuitPython_PyBadger#54 from FoamyGuy/pybadge_lc_compatibility > update rtd py version
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The MAX7219 supports chaining multiple chips in series, this pull request adds support for that functionality and implements a class for a chain of 8x8 LED matrices.
adafruit_max7219.max7219.ChainableMAX7219Adds chainable support by modifying this RPi Pico MicroPython implementation to work as a subclass of
max7219in the CircuitPython ecosystem.adafruit_max7219.matrices.CustomMatrixA feature matched
adafruit_max7219.matrices.Matrix8x8that allows for displays of any rectangular configuration of 8x8 LED matrices by implementingChainableMAX7219and modifying relevant parts of the underlyingadafruit_framebufdependency.Hardware
I don't believe Adafruit carries any multi-panel 8x8 LED Matrices (yet...), but they are abundant and affordable on Amazon. I've been using this one.
Wiring
All LED Matrices need to be oriented the same way, and their driving MAX7219 chips should be chained left to right, top to bottom. So if there are multiple rows, the last chip of the first row is chained to the first chip of the second row.
Coordinate System
The top left pixel of the display is
(0, 0). Thexvalue increases from left to right while theyvalue increases from top to bottom.Demos
examples/max7219_custommatrixtest.pyis a modified version ofexamples/max7219_simpletest.pyfor a set of 4 8x8 LED Matrices arranged as a single 32x8 display:It's also possible to create displays with multiple rows of matrices:
