Hardware Setup:
Shutdown Button Setup:
In this tutorial, I will share my workaround to configure the proper shutdown button with the Raspberry Pi-4
Just open the terminal window and follow the instructions –
sudo wget https://github.com/Unio-IoT/smart-case/archive/master.zip
This will download the zip file named master.zip and you need to unzip the same by using the following command.
sudo unzip master.zip
After unzip you will get a directory named smart-case-master, please open the directory by using the following command.
cd smart-case-master
Make the script executable.
sudo chmod +x UNQ4B.py
To execute and register the script, please use the registration code provided on the sticker.
sudo python UNQ4B.py
The best method to run a program on your Raspberry Pi at startup is to use the file rc.local. In order to have a command or program run when the Pi boots, you can add commands to the rc.local file. This is especially useful if you want to power up your Pi in headless mode (that is without a connected monitor), and have it run a program without configuration or a manual start.
Editing rc.local
On your Pi, edit the file /etc/rc.local using the editor of your choice. You must edit it with root permissions:
sudo nano /etc/rc.local
Add commands to execute the python program, preferably using absolute referencing of the file location (complete file paths are preferred). Be sure to leave the line exit 0 at the end, then save the file and exit. In nano, to exit, type Ctrl-x, and then Y.
sudo python home/pi/smart-case-master/UNQ4B.py &
If your program runs continuously (runs an infinite loop) or is likely not to exit, you must be sure to fork the process by adding an ampersand (“&”) to the end of the command, like:
The Pi will run this program at bootup, and before other services are started. If you don’t include the ampersand and if your program runs continuously, the Pi will not complete its boot process. The ampersand allows the command to run in a separate process and continue booting with the main process running.
Now reboot the Pi to test it:
sudo reboot
Hints
Also, be sure to reference absolute file names rather than relative to your home folder. For example use `/home/pi/myscript.py` instead of `myscript.py`.
If you add a script into /etc/rc.local, it is added to the boot sequence. If your code gets stuck then the boot sequence cannot proceed. So be careful as to which code you are trying to run at boot and test the code a couple of times.
Note:
- Unio and Unio Smart Case logos and designs are trademarks or registered trademarks of Unio IoT Pvt. Ltd. and/or its affiliates in India and/or other countries, and may not be used without written permission.
- Python is a registered trademark of the PSF (Python Software Foundation)
- Raspberry Pi and the Raspberry Pi Logo have registered trademarks of the Raspberry Pi Foundation, which is a UK-registered charity.
- This tutorial is written with extreme caution and presented after rigorous testing. Any damage to the user’s board is not the responsibility of the writer.
