Notes about Raspberry Pi
2016-09-13 22:26
Touch screen
The offical 7 inch display is upside down when mounted in some stands.
To resolve this add lcd_rotate=2 to /boot/config.txt.
Reference: Official RPI Touchscreen - is it upside down in the frame?
Kiosk
Raspberry Pi as a Touch screen Kiosk. I suggest using the ST2240T insted since it seems to be working right out of the box according to one comment in this thread
Disable mouse cursor by starting X with -nocursor in /etc/lightdm/lightdm.conf since we don't want it on a touch screen:
...
[SeatDefaults]
...
xserver-command=X -nocursor
...
Autostart midori browser without showing the desktop by editing .config/lxsession/LXDE-pi/autostart:
#@lxpanel --profile LXDE-pi
#@pcmanfm --desktop --profile LXDE-pi
@xscreensaver -no-splash
# Disable power management and prevent blanking of the screen
@xset s off
@xset -dpms
@xset s noblank
# Auto run the browser
@midori -e Fullscreen -p -a https://haddock.updog.se
If the browser has trouble resolving the URL after boot you could create a local page with a meta-refresh directive to delay the lookup and then use that page as starting page for midori:
...
<meta http-equiv="refresh" content="5; url=https://haddock.updog.se/">
...
To run firefox in kiosk mode use R-kiosk.
Silent boot
Edit the line in /boot/cmdline.txt:
Change boot messages to go to tty2 by setting console=tty2. This way we can see boot messages by plugin in a keyboard and alt+f2 on boot.
Also add loglevel=3 logo.nologo vt.global_cursor_default=0 to the command line to not display anything else on boot.
Init scripts
Use template /etc/init.d/skeleton to create a script for a new service.
Add to boot by update-rc.d <nameofservice> defaults.
Webapplication
Serving Raspberry Pi with Flask
RFID
07 - Reading RFID tags with the raspberry pi
Start wifi on boot
Since raspbian "jessie" just edit /etc/wpa_supplicant/wpa_supplicant.conf and add the networks to connect to:
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1
network={
ssid="My AP name"
psk="password"
}
...