We want to run our python data acquisition and logger on powerup of the Pi without the need to attach a keyboard or screen:

in the example below, we assume that your python logger is named "logger.py"
credits to Matt from raspberrypi-spy

1. create a service file using the command line editor:

sudo nano /lib/systemd/system/logger.service

2. configure the service file:

[Unit]
Description=Logger Service
After=multi-user.target

[Service]
Type=idle
ExecStart=/usr/bin/python3 /home/pi/logger.py

[Install]
WantedBy=multi-user.target

3. exit the command line editor by:

[CTRL-X], [Y] then [ENTER]

4. Set permissions:

sudo chmod 644 /lib/systemd/system/logger.service

5. Configure systemd during startup:

sudo systemctl daemon-reload
sudo systemctl enable logger.service

6. Reboot the Pi and your custom service should run :

sudo reboot

7. check the status of your service using :

sudo systemctl status logger.service

if needed: stop the service

sudo logger.service ssh stop