e-paper hat

Raspberry pi 用の e-paper hat

2.13inch e-Paper HAT (D) - Waveshare Wiki

(D)が何なのかイマイチわかりませんが、たぶんこれです。

接続

Zero に 40pin をはんだ付けして、HAT を差し込む。

f:id:pongsuke:20190813122505j:plain

SPI

raspi-config から、SPI を有効化する。

SPIDEV, pil も入れる。

$ sudo apt install python-spidev python-pil

動作テスト

テスコードの取得と展開

7zipで圧縮されているようなので、

$ sudo apt-get install p7zip-full

しておく。

$ wget https://www.waveshare.com/w/upload/c/c7/2.13inch_e-paper_d_code.7z

$ mkdir 2.13inch_e-paper_d_code
$ cd 2.13inch_e-paper_d_code
$ 7za x ../2.13inch_e-paper_d_code.7z

実行する。

$ python main.py 
e-Paper busy
e-Paper busy release
e-Paper busy
e-Paper busy release
traceback.format_exc():
Traceback (most recent call last):
  File "main.py", line 28, in <module>
    font15 = ImageFont.truetype('/usr/share/fonts/truetype/wqy/wqy-microhei.ttc', 15)
  File "/usr/lib/python2.7/dist-packages/PIL/ImageFont.py", line 280, in truetype
    return FreeTypeFont(font, size, index, encoding, layout_engine)
  File "/usr/lib/python2.7/dist-packages/PIL/ImageFont.py", line 145, in __init__
    layout_engine=layout_engine)
IOError: cannot open resource

フォントが無いだと・・・？！

フォントの設定

font15 = ImageFont.truetype('/opt/vc/src/hello_pi/hello_font/Vera.ttf', 15) などとする。

んで、実行

$ python main.py 
e-Paper busy
e-Paper busy release
e-Paper busy
e-Paper busy release
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      1 #!/usr/bin/python
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・・・ループ

画像だけを表示する

#!/usr/bin/python
# -*- coding:utf-8 -*-

import epd2in13d
import time
from PIL import Image,ImageDraw,ImageFont
import traceback

try:
    epd = epd2in13d.EPD()
    epd.init()
    epd.Clear(0xFF)
    
    # read bmp file 
    # epd.Clear(0xFF)
    image = Image.open('2in13d.bmp')
    epd.display(epd.getbuffer(image))
    time.sleep(2)

except Exception, e:
    print 'traceback.format_exc():\n%s' % traceback.format_exc()
    exit()

日本語を表示する

font は /usr/share/fonts/opentype/noto/NotoSansCJK-Bold.ttc にしました。

#!/usr/bin/python
# -*- coding:utf-8 -*-

import epd2in13d
import time
from PIL import Image,ImageDraw,ImageFont
import traceback

try:
        epd = epd2in13d.EPD()
        epd.init()
        epd.Clear(0xFF)

        # Drawing on the image
        image = Image.new('1', (epd2in13d.EPD_HEIGHT, epd2in13d.EPD_WIDTH), 255)  # 255: clear the frame

        draw = ImageDraw.Draw(image)
        font15 = ImageFont.truetype('/usr/share/fonts/opentype/noto/NotoSansCJK-Bold.ttc', 15)
        draw.text((40, 20), u'ようこそ！', font = font15, fill = 0)
        draw.text((40, 60), 'e-Paper demo', font = font15, fill = 0)
        draw.text((40, 80), 'Hello world', font = font15, fill = 0)
        epd.display(epd.getbuffer(image))
        time.sleep(2)

except Exception, e:
        print 'traceback.format_exc():\n%s' % traceback.format_exc()
        exit()

クリアするだけ

#!/usr/bin/python
# -*- coding:utf-8 -*-

import epd2in13d
import time
from PIL import Image,ImageDraw,ImageFont
import traceback

try:
        epd = epd2in13d.EPD()
        epd.init()
        epd.Clear(0xFF)
except Exception, e:
        print 'traceback.format_exc():\n%s' % traceback.format_exc()
        exit()