我拥有的树莓派型号是 3b。
树莓派默认用户名 pi ，默认密码 raspberry 。
微雪墨水屏控制代码仓库（GitHub）。
微雪2.7inch e-Paper HAT（2.7英寸电子墨水屏）文档（Wiki）。
以下操作需提前配置网络。
运行程序
运行的测试程序： examples/epd_2in7_test.py 。
git clone https://github.com/waveshareteam/e-Paper.git
vim e-Paper/RaspberryPi_JetsonNano/python/app.py### e-Paper/RaspberryPi_JetsonNano/python/app.py
#!/usr/bin/python
# -*- coding:utf-8 -*-
import sys
import os
picdir = os.path.join(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 epd2in7
import time
from PIL import Image,ImageDraw,ImageFont
import traceback
# custom
from datetime import datetime
import requests
import RPi.GPIO
button1 = 5
button2 = 6
button3 = 13
button4 = 19
RPi.GPIO.setmode(RPi.GPIO.BCM)
RPi.GPIO.setup(button1, RPi.GPIO.IN, pull_up_down=RPi.GPIO.PUD_UP)
RPi.GPIO.setup(button2, RPi.GPIO.IN, pull_up_down=RPi.GPIO.PUD_UP)
RPi.GPIO.setup(button3, RPi.GPIO.IN, pull_up_down=RPi.GPIO.PUD_UP)
RPi.GPIO.setup(button4, RPi.GPIO.IN, pull_up_down=RPi.GPIO.PUD_UP)
epd = epd2in7.EPD()
epd.init()
epd.Clear(0xFF)
font24 = ImageFont.truetype(os.path.join(picdir, 'Font.ttc'), 24)
font16 = ImageFont.truetype(os.path.join(picdir, 'Font.ttc'), 16)
font36 = ImageFont.truetype(os.path.join(picdir, 'Font.ttc'), 36)
font84 = ImageFont.truetype(os.path.join(picdir, 'Font.ttc'), 84)
# Location
Lct = ['hangzhou','beijing','tianjin','shanghai']
lct = Lct[0]
c = 0
def refreshWeather():
Himage = Image.new('1', (epd.height, epd.width), 255) # 255: clear the frame
draw = ImageDraw.Draw(Himage)
key = "YOUR_KEY"
url = "https://api.seniverse.com/v3/weather/now.json?key=" + key + "&location=" + lct + "&language=zh-Hans&unit=c"
weaData = requests.get(url)
cityName = weaData.json()['results'][0]['location']['name'] # city
cityWea = weaData.json()['results'][0]['now']['text'] # weather
cityTemp = weaData.json()['results'][0]['now']['temperature'] + '°C' # temp
draw.text((10, 10), cityName, font = font36, fill = 0)
draw.text((90, 10), cityWea, font = font36, fill = 0)
draw.text((10, 50), cityTemp, font = font84, fill = 0)
# show the refresh date
dayTime = datetime.now().strftime('%Y-%m-%d %H:%M:%S')
draw.text((10, 150), u'更新时间：', font = font16, fill = 0)
draw.text((100, 150), dayTime, font = font16, fill = 0)
epd.display(epd.getbuffer(Himage))
try:
refreshWeather()
while True:
if RPi.GPIO.input(button1) == 0:
time.sleep(0.1)
if RPi.GPIO.input(button1) == 0:
c = c - 1
if c < 0:
c = 3
lct = Lct[c]
refreshWeather()
if RPi.GPIO.input(button2) == 0:
time.sleep(0.1)
if RPi.GPIO.input(button2) == 0:
c = c + 1
if c >= 4:
c = 0
lct = Lct[c]
refreshWeather()
if RPi.GPIO.input(button3) == 0:
epd.Clear(0xFF)
if RPi.GPIO.input(button4) == 0:
time.sleep(0.1)
if RPi.GPIO.input(button4) == 0:
epd2in7.epdconfig.module_exit()
exit()
except IOError as e:
logging.info(e)
except KeyboardInterrupt:
logging.info("ctrl + c:")
epd2in7.epdconfig.module_exit()
exit()感谢 @guanqr 的《树莓派利用水墨屏显示实时天气状况》。
结合 systemd 实现打开树莓派自动运行
sudo vim /etc/systemd/system/e-paper.service# systemd unit file for the e-Paper
[Unit]
# Human readable name of the unit
Description=e-Paper
[Service]
# Command to execute when the service is started
ExecStart=/usr/bin/python /home/pi/e-Paper/RaspberryPi_JetsonNano/python/app.py
# Disable Python's buffering of STDOUT and STDERR, so that output from the
# service shows up immediately in systemd's logs
Environment=PYTHONUNBUFFERED=1
# Automatically restart the service if it crashes
Restart=on-failure
# Our service will notify systemd once it is up and running
Type=notify
User=pi
[Install]
# Tell systemd to automatically start this service when the system boots
# (assuming the service is enabled)
WantedBy=default.target