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MicroPython MAX7219 8x8 LED Matrix

A MicroPython library for the MAX7219 8x8 LED matrix driver, SPI interface, supports cascading and uses framebuf

PyBoard Examples

Single 8x8 LED Matrix

import max7219
from machine import Pin, SPI
spi = SPI(1)
display = max7219.Matrix8x8(spi, Pin('X5'), 1)
display.text('1',0,0,1)
display.show()

Chain of 4x 8x8 LED Matrices Where the 4 is drawn on the DIN matrix.

import max7219
from machine import Pin, SPI
spi = SPI(1)
display = max7219.Matrix8x8(spi, Pin('X5'), 4)
display.text('1234',0,0,1)
display.show()

Chain of 8x 8x8 LED Matrices Where the 8 is drawn on the DIN matrix

import max7219
from machine import Pin, SPI
spi = SPI(1)
display = max7219.Matrix8x8(spi, Pin('X5'), 8)
display.text('12345678',0,0,1)
display.show()

Framebuf shapes and text

display.fill(0)
display.show()

display.pixel(0,0,1)
display.pixel(1,1,1)
display.hline(0,4,8,1)
display.vline(4,0,8,1)
display.line(8, 0, 16, 8, 1)
display.rect(17,1,6,6,1)
display.fill_rect(25,1,6,6,1)
display.show()

display.fill(0)
display.text('dead',0,0,1)
display.text('beef',32,0,1)
display.show()

display.fill(0)
display.text('12345678',0,0,1)
display.show()
display.scroll(-8,0) # 23456788
display.scroll(-8,0) # 34567888
display.show()

ESP8266 Examples

Default baud rate of 80Mhz was introducing errors, dropped from 10Mhz and it works consistently.

import max7219
from machine import Pin, SPI
spi = SPI(1, baudrate=10000000, polarity=0, phase=0)
display = max7219.Matrix8x8(spi, Pin(15), 4)
display.brightness(0)
display.fill(0)
display.text('1234',0,0,1)
display.show()

ESP32 Examples

Default baud rate of 80Mhz was introducing errors, dropped from 10Mhz and it works consistently.

import max7219
from machine import Pin, SPI
spi = SPI(1, baudrate=10000000, polarity=1, phase=0, sck=Pin(4), mosi=Pin(2))
ss = Pin(5, Pin.OUT)
display = max7219.Matrix8x8(spi, ss, 4)
display.text('1234',0,0,1)
display.show()

Connections

Links

• Based on deshipu's max7219.py
• micropython.org
• Docs on framebuf

License

Licensed under the MIT License.