Raspberry Piに8x8 Matrix LED 2個を繋げてみた
制御chip HT16K33
matrix 8x8 led 788ASY *2
(昔 aitendoで入手した奴かな?!)
ブレッドボードに横並びで16x8に見えるように配置
(pinは上下8pinづつになりますな)
配線
LED pin HT16K33
16 C7 (左led, 右led 共通)
15 C6
11 C5
6 C4
10 C3
4 C2
3 C1
13 C0
5 A0, A8 (左led, 右led)
2 A1, A9
7 A2, A10
1 A3, A11
12 A4, A12
8 A5, A13
14 A6, A14
9 A7, A15
試しに、circuitpythonを使って動作確認
# apt install python3-pip
# pip3 install --upgrade setuptools
# pip3 install RPI.GPIO
# pip3 install adafruit-blinka
# apt install python3-pil
# pip3 install adafruit-circuitpython-ht16k33
ValueError: No I2C device at address: 70 となる
/boot/config.txt でi2c bus 追加してた場合
# 4 i2c add
### dtoverlay=i2c-gpio,i2c_gpio_sda=0,i2c_gpio_scl=1,i2c_gpio_delay_us=2,bus=3
で、OK!!(コメント化)
busの指定が無いのが問題だけどね。CircuitPythonだからね。
sample code get
# git clone https://github.com/adafruit/Adafruit_CircuitPython_HT16K33.git
動作確認 code
[matrix16x8_heike_scroll.py]
#!/usr/bin/env python3
import time
import board
import busio
from PIL import Image
from PIL import ImageDraw
from PIL import ImageFont
from adafruit_ht16k33 import matrix
def horizontal_scroll(image, padding=True):
image_list = list()
width = image.size[0]
# Scroll into the blank image.
if padding:
for x in range(16):
section = image.crop((0, 0, x, 8))
display_section = create_blank_image()
display_section.paste(section, (16 - x, 0, 16, 8))
image_list.append(display_section)
#Scroll across the input image.
for x in range(16, width + 1):
section = image.crop((x - 16, 0, x, 8))
display_section = create_blank_image()
display_section.paste(section, (0, 0, 16, 8))
image_list.append(display_section)
#Scroll out, leaving the blank image.
if padding:
for x in range(width - 15, width + 1):
section = image.crop((x, 0, width, 8))
display_section = create_blank_image()
display_section.paste(section, (0, 0, 15 - (x - (width - 15)), 8))
image_list.append(display_section)
#Return the list of images created
return image_list
def create_blank_image():
return Image.new("RGB", (16, 8))
# Create the I2C interface.
i2c = busio.I2C(board.SCL, board.SDA)
# Create the matrix class.
matrix = matrix.Matrix16x8(i2c, address=0x70)
text = "ぎおんしょうじゃのかねのこえ しょぎょうむじょうのひびきあり さらそうじゅのはなのいろ じょう しゃひっすいのことわりをあらわす おごれるひともひさしからず ただはるのよのゆめのごとし たけきもの もついにはほろびぬ ひとえにかぜのまえのちりにおなじ"
text_len = len(text)
image = Image.new('1', (text_len*8, 8))
draw = ImageDraw.Draw(image)
font = ImageFont.truetype("/home/pi/font/misakifont/misaki_gothic.ttf", 8, encoding='unic')
draw.text((0,1), text, font=font, fill=255)
new_image = image.transpose(Image.FLIP_TOP_BOTTOM)
image_list = horizontal_scroll(new_image)
max_images = len(image_list)
while True:
for i in range(0, max_images):
matrix.image(image_list[i])
