树莓派4B加微雪2.13寸墨水屏，监测pm2.5信息

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获取pm2.5信息的教程参照我的博客https://my.oschina.net/wangandi/blog/901648
微雪2.13寸墨水屏的资料参照http://www.waveshare.net/wiki/2.13inch_e-Paper_HAT 缺什么软件包也请参照这里

打开spi
vim /boot/config.txt
添加
dtparam=spi=on

pip镜像源
pip config set global.index-url https://pypi.tuna.tsinghua.edu.cn/simple

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pacman -S gcc python-numpy make wiringpi freetype2 python-pillow
pip install spidev RPi.GPIO requests
pip install --upgrade setuptools 
pip install wiringpi
pip install --no-cache-dir pillow
pip install --upgrade pip

如果rpi.gpio安装出错，下载https://sourceforge.net/code-snapshots/hg/r/ra/raspberry-gpio-python/code/raspberry-gpio-python-code-08048dd1894a6b09a104557b6eaa6bb68b6baac5.zip
解压后运行python setup.py install

载样例包https://github.com/waveshare/e-Paper
下面的python文件要放在e-paper/RaspberryPi&JetsonNano/python/examples/里面
代中的url参照第一个网址的getData.php，格式如下{“pm”:”(23,32,35,23,32,35,3669,1042,136,13,1,1,10.0,19.9,64.4)”,”date”:”2020-02-24 13:40:01”}，我代码中另一个树莓派的地址，你也可以在同一个树莓派中使用
python代码如下：

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#!/usr/bin/python
# -*- coding:utf-8 -*-
import sys
import os
import datetime
import requests
picdir = os.path.join(os.path.dirname(os.path.dirname(os.path.realpath(__file__))), 'pic')
libdir = os.path.join(os.path.dirname(os.path.dirname(os.path.realpath(__file__))), 'lib')
if os.path.exists(libdir):
    sys.path.append(libdir)
import logging
from waveshare_epd import epd2in13_V2
import time
from PIL import Image,ImageDraw,ImageFont
import traceback
logging.basicConfig(level=logging.DEBUG)
try:
    logging.info("epd2in13_V2 Demo")
    epd = epd2in13_V2.EPD()
    logging.info("init and Clear")
    epd.init(epd.FULL_UPDATE)
    #epd.Clear(0xFF)
# Drawing on the image
    font15 = ImageFont.truetype(os.path.join(picdir, 'Font.ttc'), 15)
    font24 = ImageFont.truetype(os.path.join(picdir, 'Font.ttc'), 24)
logging.info("1.Drawing on the image...")
    image = Image.new('1', (epd.height, epd.width), 255)  # 255: clear the frame
    draw = ImageDraw.Draw(image)
#GetTime
    #time = (datetime.datetime.now() + datetime.timedelta(hours=8)).strftime('%Y.%m.%d %H:%M:%S')
    #PrintWord
    #draw.text((20, 40), '呵呵', font = font15, fill = 0)
    #PrintTime
    #draw.text((20, 80), time, font = font15, fill = 0)
    #Your PM2.5 data url
    #Content for example:
    #{"pm":"(25,37,46,25,37,46,3519,982,166,30,5,3,10.0,19.8,64.8)","date":"2020-02-24 13:30:03"}
    url = "http://192.168.1.196/pm25/getData.php"
#Format pm2.5 data
    alldata = requests.get(url)
    pmdata = alldata.json()["pm"]
    pmdata = pmdata[1:-1]
    pmdata = pmdata.split(",")
#Get time
    time = alldata.json()["date"]
#Get pm2.5,temperature,humidity
    pm25 = pmdata[4]
    temperature = pmdata[13]
    humidity = pmdata[14]
#Draw all data
    draw.text((20, 10), '空气质量:' + pm25 + 'μg/m³', font = font15, fill = 0)
    draw.text((20, 30), '温度:' + temperature + '°C', font = font15, fill = 0)
    draw.text((20, 50), '湿度:' + humidity + '%', font = font15, fill = 0)
    draw.text((20, 70), time, font = font15, fill = 0)
    draw.text((20, 90), 'By Andy', font = font15, fill = 0)
#ScreenRotate180
    image = image.transpose(Image.ROTATE_180)
    epd.display(epd.getbuffer(image))
logging.info("Goto Sleep...")
    epd.sleep()
except IOError as e:
    logging.info(e)
except KeyboardInterrupt:
    logging.info("ctrl + c:")
    epd2in13_V2.epdconfig.module_exit()
    exit()