This is a micropython library for MAX7219 + 8 x 7digit display boards.

I have tested it with both an ESP8266 and a ESP32, running micropython version 1.19.1.

Requires a minimum of three spare GPIO lines to run SPI.

Example of use:

.. code:: python

Connections:

SCK (CLK) -> GPIO4 (D2)

MOSI (DIN) -> GPIO2 (D4)

SS (CS) -> GPIO5 (D1)

from machine import Pin, SPI import max7219_8digit

the max7219 doesn't use the MISO, but unfortunately SoftSPI requires that

we specify it anyway

spi = SoftSPI(baudrate=100000, polarity=1, phase=0, sck=Pin(4), mosi=Pin(2), miso=Pin(0))

ss = Pin(5, Pin.OUT)

display = max7219_8digit.Display(spi, ss) display.write_to_buffer('12345678') display.display()

There is also a write_to_buffer_with_dots method, which attempts to use the display decimal points properly. Note that there are some rather big bugs in this at the moment, do not put dots at the start of the string, or put two of them in a row.

.. code:: python

Connections:

SCK (CLK) -> GPIO4 (D2)

MOSI (DIN) -> GPIO2 (D4)

SS (CS) -> GPIO5 (D1)

from machine import Pin, SPI import max7219_8digit

spi = SoftSPI(baudrate=100000, polarity=1, phase=0, sck=Pin(4), mosi=Pin(2), miso=Pin(0))

ss = Pin(5, Pin.OUT)

display = max7219_8digit.Display(spi, ss) display.write_to_buffer_with_dots('1234.56.78') display.display()