Recently one of our clients approached us to develop an application that would run on a Raspberry Pi to use in kiosk’s throughout their facilities. We ended up writing a web app in Angular that they would run via Chromium.
One of their requirements was the Pi shouldn’t go to sleep and appear always-on to their users. While we’ve already successfully launched the system, I have a feeling others will want to use this same functionality in the future. So, without further ado, here are the steps we used in setting up each device to run in kiosk mode:
For our purposes, we’re going to assume you’ve got your application running at http://localhost:5000 and deployed just fine.
We’ll also be using the Pi’s default OS of Raspian.
First, let’s install some prerequisites.
sudo apt-get install x11-xserver-utils unclutter
We’re going to launch Chromium after boot-up with the following settings:
- Incognito mode (so it doesn’t try to restart your last session after you inevitably kill the power)
- Kiosk mode
- Turn off pinch (so users can’t zoom in/out)
- Overscroll history navigation (to disable a user from scrolling left/right to go back/forward in the browser)
To do this we’ll be editing the autostart file in .config/lxsession/LXDE-pi/. So navigate to it with:
Then edit it with nano like so:
sudo nano autostart
Once you’re in there, add this line to the end of the file:
@chromium-browser --kiosk --incognito --disable-pinch --overscroll-history-navigation=0 http://localhost:5000
This launches Chromium with the settings we mentioned above and directs it immediately to your site at http://localhost:5000.
Turn off the Screen Saver and Hide the Cursor
While you’re still editing the autostart file, add the following:
@xset s noblank @xset s off @xset -dpms @unclutter -idle 0.1 -roo
Then save your changes and exit the autostart file.
Now to keep your Pi from falling asleep we’ll edit the lightdm.conf file.
sudo nano /etc/lightdm/lightdm.conf
Modify the xserver-command line to read:
xserver-command= X -s 0 -dpms
Then save and exit.
Disable Power Management on WiFi
The Pi’s WiFi will also go to sleep if we don’t change it. Modify it by editing the rc.local file with:
sudo nano /etc/rc.local
Add the following line before exit 0 and save:
iwconfig wlan0 power off
You’re in Business
All that’s left is to reboot your Pi. Once it restarts you’ll load directly to Chromium viewing your local application.
If you find any “gotchas” or improvements to the steps above be sure to leave a comment!