Using 8x8 Dot Matrix LED with Raspberry Pi & Cascade Connection

MAX7219 Arduino用ドットマトリクスモジュール4-in-1ディスプレイ5pinライン 

てのを衝動買いしてしまったので、Raspberry Piで試してみました。

3.3Vで動きましたね

配線
MAX7219 Pin Name Remarks RPi Pin RPi Function
1 VCC +5V Power 　　　　　1 3.3V
2 GND Ground         　　　　6 GND
3 DIN Data In        　　　　19 GPIO 10 (MOSI)
4 CS Chip Select    　　　　24 GPIO 8 (SPI CE0)
5 CLK Clock        　　　　　23 GPIO 11 (SPI CLK)

ライブラリは以下のを使用させて頂きました。

https://github.com/rm-hull/luma.led_matrix

# git clone https://github.com/rm-hull/max7219.git

# cd max7219

# python3 setup.py install

[sample script]

#!/usr/bin/env python3

# -*- coding: utf-8 -*-

import time

import argparse

from luma.led_matrix.device import max7219

from luma.core.interface.serial import spi, noop

from PIL import ImageFont

font  = ImageFont.truetype("/home/pi/font/misakifont/misaki_gothic.ttf", 8, encoding='unic')

from PIL import Image

from PIL import ImageDraw

from PIL import ImageFont

_WIDTH=8

def horizontal_scroll(n, image, padding=True):

        image_list = list()

        width = image.size[0]

        w, hight = image.size

        # Scroll into the blank image.

        if padding:

            for x in range(n*_WIDTH):

                section = image.crop((0, 0, x, hight))

                display_section = create_blank_image(n, hight)

                display_section.paste(section, (_WIDTH*n - x, 0, _WIDTH*n, hight))

                image_list.append(display_section)

        #Scroll across the input image.

        for x in range(8*n, width + 1):

            section = image.crop((x - _WIDTH*n, 0, x, hight))

            display_section = create_blank_image(n, hight)

            display_section.paste(section, (0, 0, _WIDTH*n, hight))

            image_list.append(display_section)

        #Scroll out, leaving the blank image.

        if padding:

            for x in range(width - (_WIDTH*n-1), width + 1):

                section = image.crop((x, 0, width, hight))

                display_section = create_blank_image(n, hight)

                display_section.paste(section, (0, 0, ((8*n)-1) - (x - (width - ((8*n)-1))), hight))

                image_list.append(display_section)

        #Return the list of images created

        return image_list

def create_blank_image(n, hight):

      return Image.new("RGB", (_WIDTH*n, hight))

def main(n, block_orientation, rotate, inreverse):

    # create matrix device

    serial = spi(port=0, device=0, gpio=noop())

    device = max7219(serial, cascaded=n or 1, block_orientation=block_orientation,

                     rotate=rotate or 0, blocks_arranged_in_reverse_order=inreverse)

    text = "春はあけぼの やうやう白くなり行く、山ぎはすこしあかりて、むらさきだちたる雲のほそくたび きたる 夏は夜 夏は夜月のころはさらなり やみもなほ、ほたるの多く飛びちがひたる また、ただ一つ二つなど、ほのかにうち光りて行くもをかし 雨など降るもをかし"

    text_len = len(text)

    image = Image.new('1', (text_len*8, 8))

    draw  = ImageDraw.Draw(image)

    font  = ImageFont.truetype("/home/shin/font/misakifont/misaki_gothic.ttf", 8, encoding='unic')

    draw.text((0,0), text, font=font, fill=255)

    image_list = horizontal_scroll(n, image)

    max_images = len(image_list)

    while True:

      for i in range(0, max_images):

      #   device.display(image_list[i].convert(device.mode))
         device.display(image_list[i].convert('1'))

#         time.sleep(0.1)

         time.sleep(0.5)

if __name__ == "__main__":

    parser = argparse.ArgumentParser(description='matrix_demo arguments',

        formatter_class=argparse.ArgumentDefaultsHelpFormatter)

    parser.add_argument('--cascaded', '-n', type=int, default=4, help='Number of cascaded MAX7219 LED matrices')

    parser.add_argument('--block-orientation', type=int, default=-90, choices=[0, 90, -90], help='Corrects block orientation when wired vertically')

    parser.add_argument('--rotate', type=int, default=0, choices=[0, 1, 2, 3], help='Rotate display 0=0°, 1=90°, 2=180°, 3=270°')

    parser.add_argument('--reverse-order', type=bool, default=False, help='Set to true if blocks are in reverse order')

    args = parser.parse_args()

    try:

        main(args.cascaded, args.block_orientation, args.rotate, args.reverse_order)

    except KeyboardInterrupt:

        pass