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Middager

Displaying a google-kalender on a 8x8 diode matrix display Using the library to drive the dot matrix led display cascaded: https://pypi.org/project/luma.led_matrix/

working-calendar-display.mov

Requirements:

pip3 install --upgrade luma.led_matrix
pip3 install --upgrade google-api-python-client google-auth-httplib2 google-auth-oauthlib
pip3 install --upgrade python-dateutil
pip3 install backports-datetime-fromisoformat

In case of error message on installing the libraries, this might work:

sudo apt-get install libjpeg-dev zlib1g-dev
pip install Pillow

Installation

Make sure the SPI is enabled.

  • Go to https://developers.google.com/calendar/quickstart/python
  • run the "Enable the Google Calendar API".
  • Give the project a name and hit "Next"
  • Select "Desktop app" and hit "Create"
  • Press Download Client Configuration and save in root directory (/home/pi/) as ".creds.json". Full pat should be /home/pi/.creds.json

Connect the display to the serial ports pins with Raspi IO pins

Run the program using command:

python3 Middager/middag.py

When powering up, have the led display disconnected from power as the load might make starting up the Pi a strain on the input voltage.

In case of error message from the dot-matrix driver, try chaning line 69 of middag.py to

        serial = spi(port=0, device=0, cs_high=True, gpio=noop())

Command line arguments

The program iterprets some command line arguments. Tese are:

Argument Description
-h, --help The help instructions
-m, --mode Repeat mode. Specify 'loop' as argument if the program should enter an eternal loop

Specifying nothing will keep the program running for 10 minutes approximately, suitable for a cron based run schedule

Setting up continuous running from boot

CRON run

To run the display continuously, enter a crontab line like this:

*/10 * * * * python3 /home/pi/Middager/middag.py

Service

Alternatively, install as service by copying the service file /lib/systemd/system using root:

sudo cp  middager-sync.service /lib/systemd/system/middager-sync.service

When service file is in place, run the following commands to verify and start the service:

sudo chmod 644 /lib/systemd/system/middager-sync.service
chmod +x /home/pi/Middager/middager-sync.service
sudo systemctl daemon-reload
sudo systemctl enable middager-sync.service
sudo systemctl start middager-sync.service