The adafruit_circuitpython_max7219's intro from mrmcwethy

adafruit_circuitpython_max7219's Introduction

Introduction

CircuitPython driver for the MAX7219 LED matrix driver chip.

.. seealso:: See `here <https://github.com/adafruit/micropython-adafruit-max7219>`_ for the equivalent MicroPython driver.

Dependencies

This driver depends on:

Adafruit CircuitPython

Please ensure all dependencies are available on the CircuitPython filesystem. This is easily achieved by downloading the Adafruit library and driver bundle.

Usage Example

Examples

adafruit_max7219.Matrix8x8 Example

from  adafruit_max7219 import matrices
from board import TX, RX, A2
import busio
import digitalio
import time

clk = RX
din = TX
cs = digitalio.DigitalInOut(A2)

spi = busio.SPI(clk, MOSI=din)
display = matrices.Matrix8x8(spi, cs)
while True:
    display.brightness(3)

    display.fill(1)
    display.pixel(3, 3)
    display.pixel(3, 4)
    display.pixel(4, 3)
    display.pixel(4, 4)
    display.show()
    time.sleep(3.0)

    display.clear_all()
    s = 'Hello, World!'
    for c in range(len(s)*8):
        display.fill(0)
        display.text(s,-c,0)
        display.show()
        time.sleep(0.25)

adafruit_max7219.BCDDigits Example

from  adafruit_max7219 import bcddigits
from board import TX, RX, A2
import bitbangio
import digitalio

clk = RX
din = TX
cs = digitalio.DigitalInOut(A2)

spi = bitbangio.SPI(clk, MOSI=din)
display = bcddigits.BCDDigits(spi, cs, nDigits=8)
display.clear_all()
display.show_str(0,'{:9.2f}'.format(-1234.56))
display.show()