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Using Raspberry Pis to drive Digital Signage in Libraries and beyond
1. Using Raspberry Pi's to drive
Digital Signage in Libraries and
beyond
DR JON KNIGHT, IT SERVICES, LOUGHBOROUGH UNIVERSITY
2. Digital Signage in Loughborough
University Library
Why does the Library want digital signage?
To show actively changing information publicly
To reduce the need for library staff to maintain lists of
bookings, event posters, etc.
To provide event specific information and guidance
To promote library resources and events
3. Original digital signage in the Library
Before refurbishment the Library did have some digital
signage screens.
Commercial system that was installed and run by the
University's central marketing and catering organisations.
Showed things such as campus menus, University
promotional material and Library opening times.
Equipment was quite expensive & power hungry, with
annual licence fees too.
4. Refurbishment: an opportunity for a
rethink
Much of the library building was refurbished between March and
September 2013 at a cost of just under £5m.
Level 4 that had been the library school became space for PC labs, group
study rooms and leisure reading collection.
Entrance level extensively remodeled, with new staircase up to Level 4.
Aimed to not only replace tired building fabric and facilities but provide
more high quality study spaces for students.
IT Services moved their main help point, the "PC Clinic", into the Library as
part of the concentration of student support facilities.
5. Things to display after refurbishment
Two main uses:
Group study & meeting room bookings (from our home grown Web User
Booking System).
PC availability, both within the library and in PC labs elsewhere on campus.
Other uses:
PC Clinic information (which changes during the year).
Library opening hours.
Other library promotional/event information.
6. The Raspberry Pi
Introduced February 2012 by the Raspberry Pi Foundation, initially to help
teach computer science and IT literacy in UK schools.
Very cheap (<£50 including power supply)
Low power requirements
Even initial models could drive HDMI video connections with HD video and
display simple static web pages.
Runs Linux, and thus has a large supply of open source software available
to it.
Small physical footprint (easy to secure / hide!)
9. Screenly OSE – open source digital
signage package
Free open source edition of a digital signage system maintained by
Screenly Inc.
Available from https://www.screenly.io/ose/
Supports web page display, images and video up to 1080p.
Easy to install with pre-configured Raspbian operating system (the
Raspberry Pi version of Debian Linux).
Locked down web management via secure SSH tunnels.
Homegrown web admin allows library (& other depts) to manage screen
contents.
10. Lab PC availability display
Had a pre-existing Application Programming Interface (API) available from
earlier Library mobile app development.
Extracts machine usage using extension attributes in Active Directory, with
each PC lab in its own Organizational Unit
Extracted data placed into a MySQL database for ease of access and to
reduce AD LDAP look ups from lots of displays.
Also checks with central timetabling system (CMIS) and our own WUBS for
labs that have been booked for lectures and events.
Updates the display every 2 minutes
Shows bookable labs in one column, open access PCs in other.
12. Group study room bookings
Home grown Web User Booking System has provided staff and students
with study room booking ability via the web for over a decade and already
has an API we could use.
Can show either a "full" or "reduced" display depending on how many
resources & bookings need to be shown. Reduced display just shows
previous, current and next bookings for each resource.
Library levels (floors) are "branded" with a colour which is shown in the
title bar background.
For each booking we show the start and end times and surname of person
booking it.
Updated every 2 minutes, with last update time shown on display.
15. What can go wrong?
Some common issues we've found:
Early 5V USB power supplies failing after some years of constant use.
SD cards failing (especially older ones).
Display screens failing (nothing to do with the Raspberry Pi!).
Very occasional lock ups that require a power cycle to reboot.
Raspberry Pi's are cheap enough that we keep a box of spare boards and
SD cards so replacement is quick and downtime minimized.
16. The evolution of the Raspberry Pi
Raspberry Pi hardware development hasn't stood still!
Original Raspberry Pi Model B had a 700MHz ARMv6 CPU, 512MB of RAM,
2 USB ports, a 100Mbps wired Ethernet & SD card slot.
Latest Raspberry Pi 3 has 1.2 GHz 64-bit quad-core ARM Cortex-A53 CPU,
1GB of RAM, 4 USB ports, wired & wireless Ethernet, Bluetooth and micro-
SD card.
Other similar single board computers are also now available, some sharing
the Raspberry Pi's physical size and I/O pin layouts.
Lots of add-on boards and cases available – quite a well-developed
"ecosystem" of support.
17. What else could you use a Pi driven
display for?
Display library opening hours (handy if it changes during
term/vacation/closure periods)
Show live video streams from events elsewhere in the building/campus.
Show live library social media postings.
OPAC and reading list public terminals.
Helpdesk queue management
Self-help touch screen kiosks (eg setting up eduroam on phones or central
printers on student laptops)
20. Further information
Our Middleware & Library Systems blog posts on Raspberry Pi uses:
http://blog.lboro.ac.uk/middleware/blog/tag/raspberry-pi
D-Lib magazine article by Dr Jason Cooper & myself:
http://www.dlib.org/dlib/may14/cooper/05cooper.html
Raspberry Pi Foundation:
https://www.raspberrypi.org/
Screenly OSE:
https://www.screenly.io/ose/