Making our program start automatically

As with our previous projects, we now need to make our program start as soon as we switch our Pi Zero on:

Now, we will create our service definition file; type this:

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

Now, type the definition into it:

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

[Service]
Type=idle
ExecStart=/home/pi/WearableTech/Chapter5/ledTshirt.py

[Install]
WantedBy=multi-user.target

Save and exit Nano by typing Ctrl + O, followed by Enter, and then Ctrl + X. Now, change the file permissions, reload the systemd daemon, and activate our service by typing this:

sudo chmod 644 /lib/systemd/system/twitterTshirt.service 
sudo systemctl daemon-reload
sudo systemctl enable twitterTshirt.service 

Now, we need to test if this is working, so reboot your Pi by typing sudo reboot, and then when your Pi Zero restarts, you should be able to send it a Tweet and see the LEDs light up. Once you are happy that it is all working correctly...