Small LED Matrix Numbers

Something I did a few (8) years ago on the Arduino to display two-digit numbers on a 8x8 LED matrix like one controlled my a max7219, this is an update to do the same in Micropython.

Numbers have been defined to 3x5 pixels, so for a two-digit number it fits into a 8x5 LED grid with spacing, saving some LED Matrix space.

Smaller numbers.

The code for this can be found here on GitHub numbers.py

import max7219
import time
from machine import Pin, SPI
from framebuf import MONO_HLSB, MONO_HMSB, MONO_VLSB


def compact_number(display, number, offx=0, offy=0, rotate=0):
    """
    Display compact numbers so two digits fit in 8x5 LED grid
    display = instance of max7219 display
    number  = number to display
    offx    = x offest position
    offy    = y offest position
    rotate  = number of times to rotate 90 degress clockwize
    """

    digits = [
        [0x2, 0x5, 0x5, 0x5, 0x2],
        [0x2, 0x6, 0x2, 0x2, 0x7],
        [0x6, 0x1, 0x2, 0x4, 0x7],
        [0x6, 0x1, 0x2, 0x1, 0x6],
        [0x1, 0x5, 0x7, 0x1, 0x1],
        [0x7, 0x4, 0x6, 0x1, 0x6],
        [0x3, 0x4, 0x6, 0x5, 0x2],
        [0x7, 0x1, 0x2, 0x2, 0x2],
        [0x2, 0x5, 0x2, 0x5, 0x2],
        [0x2, 0x5, 0x3, 0x1, 0x6],
    ]
    num = [] 
    for row in range(0, len(digits[0])):
        num.append(
            "{0:08b}".format(digits[number // 10][row] << 4 | digits[number % 10][row])
        )
    if rotate > 0:
        for i in range(0,rotate):
            num = list(zip(*num[::-1]))
    display.fill(0)
    for y in range(0, len(num)):
        for x in range(0, len(num[y])):
            if num[y][x] == "1":
                display.pixel(x + offx, y + offy, 1)
    display.show()

if __name__ == "__main__":
    spi = SPI(0, baudrate=10000000, polarity=1, phase=0, sck=Pin(2), mosi=Pin(3))
    ss = Pin(5, Pin.OUT)
    display = max7219.Matrix8x8(spi, ss, 1)

    display.brightness(1)
    display.fill(0)
    display.show()

    for number in range(0, 100):
        compact_number(display, number,rotate=3)
        time.sleep(0.1)
    for number in range(0, 100):
        compact_number(display, 99-number,rotate=3)
        time.sleep(0.1)

This original Arduino code is here.