===Raspberry Pi Video Display===

The Stairwell displays are run by four Raspberry Pi mini computers. Communication to the Pis is from the Ubuntu machine, ''auscope-screens''  at 131.217.62.142. User ''auscope'', password the usual.

Please power down the stairwell monitors using the switches under the main desk labelled Screen 1, Screen 2, after hours to save power. Please power them up at 8-9am weekdays if you are in the control room. The Raspberry Pi's are shutdown automatically at 4:55pm each day by a cron job on ''auscope-screens''.

The power switch labeled Screen 4 also powers the Raspberry Pi's.

There are instructions for controlling the displays on the Desktop of ''auscope-screens''. You can ssh or vnc the Raspberry Pi's after first logging into the ''auscope-screens'' machine. The Pi's are on a subnet, quarantined from the uni network, routed through auscope-screens. The Pi's can display video, pdf's, slide shows in pdf format, and can access web pages and resources.

==Instructions==

Turn off/on power switches for screens under desk in Auscope room (north west corner).

[1][2]\\
[3][4]

The four pi (and network switch) are connected to switch [4] power, and will boot and loop video when powered on.

A cron job on ''auscope-screens'' will shut the pi down at 4:55 pm daily (shutdownpi.sh).
If communication is lost, power cycle Pi's with power switch [4] under desk.
On boot the pi should start looping through randomly selected movies.
(play.sh called in /etc/rc.local on pi)

You can ssh each pi[1-4], user is pi, e.g.
<code>
ssh pi@pi2
</code>

SSH keys are all in place. Passwords are all the usual.

You can also vnc each pi[1-4], e.g.
<code>
vncviewer pi3
</code>


==Network==
For remote access first ssh into  auscope@131.217.62.142, then ssh the pi

Outside internet access for the pi's is achieved by forwarding all packets through the ''auscope-screens' machine.
It appears to the outside world that all traffic emanates from 131.217.62.142
More detail on the networking of the screen computers is in pi_network.txt on the ''auscope-screens'' Desktop.

==Software==

useful software on pi:
omxplayer (video)
gpicview  (lightweight image viewer)
epiphany (web browser)

Turn off screen blanking on pis with this line in /etc/lightdm/lightdm.conf under 
<code>
[SeatDefaults]
xserver-command=X -s 0 dpms
</code>

Start x programs on startup in /etc/xdg/lxsession/LXDE-pi/autostart

Epiphany-browser full screen, F11