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
| PyBoard | max7219 8x8 LED Matrix |
|---|---|
| VIN | VCC |
| GND | GND |
| X8 MOSI | DIN |
| X5 CS | CS |
| X6 SCK | CLK |
| Wemos D1 Mini | max7219 8x8 LED Matrix |
|---|---|
| 5V | VCC |
| GND | GND |
| D7 MOSI (GPIO13) | DIN |
| D8 CS (GPIO15) | CS |
| D5 SCK (GPIO14) | CLK |
| ESP32 | max7219 8x8 LED Matrix |
|---|---|
| 5V | VCC |
| GND | GND |
| D2 MOSI | DIN |
| D5 CS | CS |
| D4 SCK | CLK |
Links
License
Licensed under the MIT License.