Raspberry Pi in Higher Education - Databaselabdatabaselab.org/files/cambridge.pdf · Raspberry Pi...
35
Seite 1 Raspberry Pi in Higher Education Alexander Elsas Goethe University Frankfurt, Germany [email protected] The Raspberry Pi Big Birthday Weekend, Cambridge
Transcript of Raspberry Pi in Higher Education - Databaselabdatabaselab.org/files/cambridge.pdf · Raspberry Pi...
Seite 1
Raspberry Pi in Higher Education
Alexander ElsasGoethe University Frankfurt, Germany
The Raspberry Pi Big Birthday Weekend, Cambridge
Seite 2
Alexander Elsas
Assistant Professor
Economics, Management & Information Systems
Database developer with APEX
Information Systems for Business Students
Management for Computer Science Students
Raspberry Pi since February 2012
Seite 3
Seite 4
To Carry Coals to Newcastle
● Price tag● Performance● Flexibility● GPIO● Wolfram● ...
Seite 5
Experiences so far
Introduced the Raspberry Pi in every introductory course for business students since winter semester 2012:
● Always an overwhelming positive reaction,● lots of questions far beyond the syllabus,● biggest motivation the multimedia center.
Based on these positive reactions the “Two Simple Projects“ have been created.
Seite 6
Two Simple Projects
PiMMS: Pi-based Multimedia System
FRAdir: Operating directions of Frankfurt Airport
Objective:
Get business students an intro into computer science (information systems) and provide them a feeling of success to boost their motivation.
Seite 7
PiMMS
Turn-key digital signage system:
Power-on on premise
No network connectivity needed
No manual configuration necessary
Boots into slideshow No coding, just configuration of existing programs
Fast results, product can be used in a real-life scenario
Possible extension: integrate network connectivity
Seite 8
FRAdir
FRAport publishes the actual direction of operation of Frankfurt Airport (FRA) on their website (07 East / 25 West)
Objective: Gather data from the website, store it in a database for later analysis
Programming exercise in Python in a nutshell
Possible extension: 7-segment LED display
Seite 9
Show-and-Tell
Both projects can be seen tomorrow.
Seite 10
Computer Science Students
● Course “Introduction into ERP“● Very SAP-oriented● Students “hate“ SAP● Open Source ERP with Raspberry Pi● Installation and configuration of OpenERP (now Odoo:
http://en.wikipedia.org/wiki/Odoo) ● Comparison of performance, GUI, etc
Seite 11
Further projects in the pipeline
● SQL-Box:
Raspberry Pi as database server, equipped with MySQL or SQLite as SQL learning tool
● Pi-Lab:
Establish an infrastructure on campus to support more advanced projects
● Ideas from the audience ...
Seite 12
Best Programming Language?
● Learning to programme is independent from a specific language.
● A problem must be analyzed, divided in sub-problems, etc …
● At the end of the day the remaining problems are on the level of individual statements of the chosen programming language.
Programming is a process, not a language!
Seite 13
Something completely different
Raspberry Pi and its success, ecosystem, created jobs and businesses as object of economic analysis.
Seite 14
Contact
Alexander Elsas
Goethe-Universität Frankfurt
Theodor-W.-Adorno-Platz 3
D-60323 Frankfurt
Telephone: +49 69-798 33636
Fax: +49 69-798 33639
Email: [email protected]
Internet: databaselab.de
Seite 1
PiMMS & FRAdir – Two Simple Projects
Alexander ElsasGoethe University Frankfurt, Germany
The Raspberry Pi Big Birthday Weekend, Cambridge
Seite 2
Two Simple Projects
PiMMS: Pi-based Multimedia System
FRAdir: Operating directions of Frankfurt Airport
Objective:
Get business students an intro into computer science (information systems) and provide them a feeling of success to boost their motivation.
Seite 3
PiMMS
Turn-key digital signage system:
Power-on on premise
No network connectivity needed
No manual configuration necessary
Boots into slideshow No coding, just configuration of existing programs
Fast results, product can be used in a real-life scenario
Possible extension: integrate network connectivity on premise
Seite 4
Seite 5
Seite 6
Seite 7
Components
Monitor feh as slideshow application
starts automatically after booting into LXDE xscreensaver to disable screensaver of LXDE
sudo apt-get install feh xscreensaver
Seite 8
Technical Details
feh -pzrFYD10 slideshows in slideshow, make slideshow executable(http://man.finalrewind.org/1/feh/ for options of feh)
Autostart in LXDE:Add @/home/pi/slideshow to /etc/xdg/lxsession/LXDE-pi/autostart
Seite 9
Looking for ...
Replacement for feh which can also show video (like Irfanview)
Seite 10
FRAdir
FRAport publishes the actual direction of operation of Frankfurt Airport (FRA) on their website (07 East / 25 West)
Objective: Gather data from the website, store it in a database for later analysis
Programming exercise in Python in a nutshell
Possible extension: 7-segment LED display
Seite 11
Data source: http://apps.fraport.de/betriebsrichtung/betriebsrichtung.html
Seite 12
Source Code: betriebsrichtung.py
#!/usr/bin/python
import urllib, time, sqlite3, smtplib
from email.message import Message
#URl einlesen
sock = urllib.urlopen("http://apps.fraport.de/betriebsrichtung/betriebsrichtung.html")
htmlSource = sock.read()
sock.close()
beg = htmlSource.find("Betriebsrichtung")
betriebsrichtung = htmlSource[beg+60]
if (betriebsrichtung == "0"):
betriebsrichtung = "Ost 07"
else:
betriebsrichtung = "West 25"
Seite 13
seit = htmlSource.find("seit")
datum = htmlSource[seit+5:seit+15]
zeit = htmlSource[seit+17:seit+25]
sep = ";"
ausgabe = betriebsrichtung+ sep+ datum+" "+ zeit+ sep+ time.strftime("%c")
print ausgabe
Seite 14
f = open('status.br', 'r')
last = f.readline()
f.close()
#print last
msg = Message()
msg.set_payload(ausgabe)
msg["Subject"] = "Betriebsrichtung: "+betriebsrichtung
msg["From"] = "[email protected]"
msg["To"] = "[email protected]"
Seite 15
if (last[0] <> betriebsrichtung[0]):
#print "Wechsel!!!"
f = open('status.br', 'w')
f.write(betriebsrichtung)
f.close
# csv fortschreiben
f = open('br.csv', 'a')
f.write(ausgabe+'\n')
f.close
# html datei updaten
sep = "<br>"
ausgabe = "<div style>"+betriebsrichtung+ sep+ "Seit: " +datum+" "+ zeit+ sep+"Update: "+ time.strftime("%c")+"</div>"
f = open('/var/www/br.html', 'w')
f.write(ausgabe)
f.close
Seite 16
# datenbank
#if (True):
db = sqlite3.connect('br.db')
cursor = db.cursor()
cursor.execute('''INSERT INTO br(id, richtung, zeit, bemerkung)VALUES(NULL,?,?,?)''', (betriebsrichtung, zeit+";"+datum, ' '))
db.commit()
db.close()
Seite 17
#if (True):
smtpobj = smtplib.SMTP("smtp.gmail.com", 587)
smtpobj.ehlo()
smtpobj.starttls()
smtpobj.ehlo()
smtpobj.login('[email protected]', 'mysecretpassword')
smtpobj.sendmail('[email protected]', '[email protected]', msg.as_string())
smtpobj.quit
Seite 18
Email on midday: statusbr.py
#!/usr/bin/python
import smtplib
from email.message import Message
f = open('status.br', 'r')
last = f.readline()
f.close()
msg = Message()
msg.set_payload(last)
msg["Subject"] = "Betriebsrichtung: "+last
msg["From"] = "[email protected]"
msg["To"] = "[email protected]"
smtpobj = smtplib.SMTP("smtp.gmail.com", 587)
smtpobj.ehlo()
smtpobj.starttls()
smtpobj.ehlo()
smtpobj.login('[email protected]', 'mysecretpassword')
smtpobj.sendmail('[email protected]', '[email protected]', msg.as_string())
smtpobj.quit
Seite 19
Crontab
betriebsrichtung.py is started hourly
statusbr.py always on midday
Seite 20
Seite 21
Contact
Alexander Elsas
Goethe-Universität Frankfurt
Theodor-W.-Adorno-Platz 3
D-60323 Frankfurt
Telephone: +49 69-798 33636
Fax: +49 69-798 33639
Email: [email protected]
Internet: databaselab.de
