Instructions on setting up a Raspberry Pi Zero WH with a Waveshare ePaper 7.5 Inch HAT. The screen will display date, time, weather icon with high and low, and calendar entries.
- Shopping list
- Setup the PI
- Setup dependencies
- Using this application
- Pick a Weather provider
- Pick a Calendar provider
- Run it
- Troubleshooting
- Waveshare documentation and sample code
Waveshare 7.5 inch epaper display HAT 640x384
Raspberry Pi Zero WH (presoldered header)
microSDHC card
I've got a separate post for this, prepare the Raspberry Pi with WiFi and SSH. Once the Pi is set up, and you can access it, come back here.
Turn the Pi off, then put the HAT on top of the Pi's GPIO pins.
Connect the ribbon from the epaper display to the extension. To do this you will need to lift the black latch at the back of the connector, insert the ribbon slowly, then push the latch down. Now turn the Pi back on.
sudo apt install git ttf-wqy-zenhei ttf-wqy-microhei python3 python3-pip python-imaging libopenjp2-7-dev libjpeg8-dev inkscape figlet wiringpi
sudo pip3 install python-dateutil astral spidev RPi.GPIO Pillow # Pillow took multiple attempts to install as it's always missing dependencies
sudo pip3 install --upgrade google-api-python-client google-auth-httplib2 google-auth-oauthlib msal
sudo sed -i s/#dtparam=spi=on/dtparam=spi=on/ /boot/config.txt #This enables SPI
sudo reboot
wget http://www.airspayce.com/mikem/bcm2835/bcm2835-1.58.tar.gz
sudo tar zxvf bcm2835-1.58.tar.gz
cd bcm2835-1.58/
sudo ./configure
sudo make
sudo make check
sudo make install
git clone this repository in the /home/pi directory.
cd /home/pi
git clone --recursive https://github.com/mendhak/waveshare-epaper-display.git
This should create a /home/pi/waveshare-epaper-display directory.
Copy env.sh.sample (example environment variables) to env.sh
Modify the env.sh file and set the version of your Waveshare 7.5" e-Paper Module (newer ones are version 2)
export WAVESHARE_EPD75_VERSION=2
You can pick between OpenWeatherMap, Met Office, AccuWeather, Met.no and Climacell to provide temperature and weather forecasts.
You can switch between them too, by providing the keys and commenting out other ones, but remember to delete the weather-cache.json if you switch weather providers.
Register on the OpenWeathermap website, and go to the API Keys page, that's the key you'll need. Add it to the env.sh file.
export OPENWEATHERMAP_APIKEY=xxxxxx
Create an account on the Met Office Weather DataHub site.
Next, register an application - just call it Raspberry Pi or Home Project.
You'll be shown a Client Secret, and a Client ID. Copy both of these somewhere, you'll need it later.
After registering an application, you then "subscribe" to an API by going to the API Usage Plans.
Pick "Global spot data bundle" which includes the "Global daily spot data" API.
Choose the Basic (free) plan and when prompted, pick that application you previously registered.
Finally, add the Met Office Client ID and Secret to the env.sh file.
export METOFFICEDATAHUB_CLIENT_ID=xxxxxx-xxxxxx-....
export METOFFICEDATAHUB_CLIENT_SECRET=xxxxxx
Register on the AccuWeather site.
Next, register a new application.
I just named it Personal, marked it as Limited Trial, Internal App, Business to Consumer.
Once you do this you'll get an API Key, save it.
You'll also need an AccuWeather Location Key.
Do a normal AccuWeather search for your location.
The last number in the URL is the Location Key. In the example of London, it's 328328.
Add the API Key and Location Key to the env.sh.
export ACCUWEATHER_APIKEY=xxxxxx
export ACCUWEATHER_LOCATIONKEY=328328
Met.no's Terms of Service requires you to identify yourself. The purpose is to ensure they can contact you in case you overload or abuse their servers. For this reason, you just need to set your email address in env.sh like so:
export [email protected]
Note that the Met.no API provides 6 hours of forecast, rather than a full day.
Register on the Climacell site, and when you do you should be given an API Key.
Modify the env.sh file and put your Climacell API key in there.
export CLIMACELL_APIKEY=xxxxxx
Whichever weather provider you've picked, you'll need to provide the location and units to display in.
Modify the env.sh file and update with the latitude and longitude of your location.
As needed, change the temperature format (CELSIUS or FAHRENHEIT).
export WEATHER_LATITUDE=51.3656
export WEATHER_LONGITUDE=0.1963
export WEATHER_FORMAT=CELSIUS
You can use Google Calendar or Outlook Calendar to display events.
The script will by default get its info from your primary Google Calendar. If you need to pick a specific calendar you will need its ID. To get its ID, open up Google Calendar and go to the settings for your preferred calendar. Under the 'Integrate Calendar' section you will see a Calendar ID which looks like [email protected]. Set that value in env.sh
export [email protected]The Oauth process needs to complete once manually in order to allow the Python code to then continuously query Google Calendar for information.
Go to the Python Quickstart page and enable Google Calendar API. When presented, download or copy the credentials.json file and add it to this directory.
Next, SSH to the Raspberry Pi and run
python3 screen-calendar-get.py
The script will prompt you to visit a URL in your browser and then wait. Copy the URL, open it in a browser and you will go through the login process. When the OAuth workflow tries to redirect back (and fails), copy the URL it was trying to go to (eg: http://localhost:8080/...) and in another SSH session with the Raspberry Pi,
curl "http://localhost:8080/..."
On the first screen you should see the auth flow complete, and a new token.pickle file appears. The Python script should now be able to run in the future without prompting required.
I also have a post here with screenshots walking through the process.
The setup is much simpler, just run this script which will give instructions on how to login:
python3 outlook_util.py
Login with the Microsoft account you want to get the calendar from, and accept the consent screen.
After a moment, the script will then display a set of Calendar IDs and some sample events from those Calendars.
Copy the ID of the calendar you want, and add it to env.sh like so:
export OUTLOOK_CALENDAR_ID=AQMkAxyz...
Note that if you set an Outlook Calendar ID, the Google Calendar will be ignored.
Run ./run.sh which should query the weather provider and Google/Outlook Calendar. It will then create a png, convert to a 1-bit black and white bmp, then display the bmp on screen.
Using a 1-bit, low grade BMP is what allows the screen to refresh relatively quickly. Calling the BCM code to do it takes about 6 seconds. Rendering a high quality PNG or JPG and rendering to screen with Python takes about 35 seconds.
Once you've proven that the run works, and an image is sent to your epaper display, you can automate it by setting up a cronjob.
crontab -e
Add this entry so it runs every minute:
* * * * * cd /home/pi/waveshare-epaper-display && bash run.sh > run.log 2>&1
This will cause the script to run every minute, and write the output as well as errors to the run.log file.
If the scripts don't work at all, try going through the Waveshare sample code linked below - if you can get those working, this script should work for you too.
You may want to further troubleshoot if you're seeing or not seeing something expected.
If you've set up the cron job as shown above, a run.log file will appear which contains some info and errors.
If there isn't enough information in there, you can set export LOG_LEVEL=DEBUG in the env.sh and the run.log will contain even more information.
The scripts cache the calendar and weather information, to avoid hitting weather API rate limits.
If you want to force a weather update, you can delete the weather-cache.json.
If you want to force a calendar update, you can delete the calendar.pickle or outlookcalendar.pickle.
If you want to force a re-login to Google or Outlook, delete the token.pickle or outlooktoken.bin.
Waveshare have a user manual which you can get to from their Wiki
The Waveshare demo repo is here. Assuming all dependencies are installed, these demos should work.
git clone https://github.com/waveshare/e-Paper
cd e-Paper
This is the best place to start for troubleshooting - try to make sure the examples given in their repo works for you.
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