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by sesam
Wed Jan 01, 2014 6:00 pm
Forum: Automation, sensing and robotics
Topic: Controlling a stepper motor with Piface and python
Replies: 14
Views: 20797

Re: Controlling a stepper motor with Piface and python

Please see the attached photo. It is a 4 wire motor for rotating the shaft where the laser is mounted on. It looks like it expects 5V. So basically, my problem can be reduced to the following: How do I construct an H-bridge with Piface ? When I am able to do this, with some slight modifications, I s...
by sesam
Tue Dec 31, 2013 6:39 pm
Forum: Automation, sensing and robotics
Topic: Controlling a stepper motor with Piface and python
Replies: 14
Views: 20797

Re: Controlling a stepper motor with Piface and python

Thank you for sharing ideas! I understand the code in the first post, you can find similar code examples doing a quick Google search. Maybe it is even possible to adapt this code for bipolar motors, if you adapt the wiring. Why not introduce the missing common wires on the bipolar motor for yourself...
by sesam
Tue Dec 31, 2013 9:34 am
Forum: Teaching and learning resources
Topic: TUTORIAL - How to control a bipoloar 4 wire stepper motor
Replies: 26
Views: 78566

Re: TUTORIAL - How to control a bipoloar 4 wire stepper moto

From here:
The outputs are driven via a standard ULN2803A darlington driver chip
You seem to be right,
a little bit of googling around and I am under the impression that ULN2803A cannot act as an H-bridge.
:(
by sesam
Tue Dec 31, 2013 9:21 am
Forum: Automation, sensing and robotics
Topic: Controlling a stepper motor with Piface and python
Replies: 14
Views: 20797

Re: Controlling a stepper motor with Piface and python

Nice tutorial. I want to try this with a 4-wire stepper motor from an old optical drive. This is a bipolar motor, instead of 5 or 6-wire motors with common wire(s). I read here for bipolar motors: ...the motor itself is simpler but the drive circuitry needed to reverse the polarity of each pair of m...
by sesam
Mon Dec 30, 2013 7:48 pm
Forum: Teaching and learning resources
Topic: TUTORIAL - How to control a bipoloar 4 wire stepper motor
Replies: 26
Views: 78566

Re: TUTORIAL - How to control a bipoloar 4 wire stepper moto

Great tutorial.

Just out of curiosity...
has anyone tried that with Piface ?
by sesam
Fri Jul 26, 2013 8:44 pm
Forum: Beginners
Topic: ssh: ECONNREFUSED
Replies: 1
Views: 3644

ssh: ECONNREFUSED

Using ssh to connect to my Pi... with my Laptop - using Putty - it works, with my Android device - using connectbot - I get ECONNREFUSED (connection closed) :?: Both using the same IP, port, user name and both devies connected via WiFi to the router, where my Pi is connected via LAN. The funny thing...
by sesam
Thu May 09, 2013 5:11 pm
Forum: Deutsch
Topic: Shell-Script per www ausführen
Replies: 8
Views: 13303

Re: Shell-Script per www ausführen

Bin gerade dabei, etwas ähnliches zu programmieren. Nur soll der Befehl nicht von einer Website kommen, sondern mit einer email geschickt werden. Die Logik soll so ein: User schickt email mit Code an RPi >>>>> RPi checkt email, erkennt Code (Python) >>>>> schreibt Code in *.sh-Datei >>>>> *.sh-Datei...
by sesam
Sun May 05, 2013 12:06 pm
Forum: Graphics, sound and multimedia
Topic: Surveillance WebCam in the Cloud
Replies: 13
Views: 5319

Re: Surveillance WebCam in the Cloud

I'm also getting the

Code: Select all

fetchmail: Error writing to MDA: Broken pipe
 not flushed
Even if I comment everything inside the parser.sh
I am trying to understand what the MDA "needs" at minimum to work.
by sesam
Sun May 05, 2013 9:07 am
Forum: Networking and servers
Topic: Using the Raspberry Pi as an overseas proxy
Replies: 7
Views: 16972

Re: Using the Raspberry Pi as an overseas proxy

This may not be an satisfactory answer, however, I would consider using services as Open DNS,
which enables you to use almost every US-related services such as Hulu, etc.

Of course, this would have nothing to do with a RPi.
But this works for me in Germany, too.
by sesam
Sat May 04, 2013 12:05 pm
Forum: Deutsch
Topic: Download aus Mediatheken (automatisiert)
Replies: 2
Views: 2532

Re: Download aus Mediatheken (automatisiert)

Hab die halbe Lösung, zumindest für die ZDF Mediathek. Zunächst zdf-dl runterladen. Damit kann man mit dem HTML-Code des Streams den Download starten: zdf-dl "http://www.zdf.de/ZDFmediathek/beitrag/video/1634214/heute-show-vom-04.05.2012?bc=sts;stm&flash=off" heute-show.wma Das erzeugte Video-File d...
by sesam
Sat May 04, 2013 10:33 am
Forum: Deutsch
Topic: Download aus Mediatheken (automatisiert)
Replies: 2
Views: 2532

Download aus Mediatheken (automatisiert)

Ich weiß, dass man mit XBMC z.B. die ZDF Mediathek streamen kann. Aber kann man den Stream auch (zur späteren Verwendung) herunterladen ? Für Win7 gibt es Stream Transport , um Flash-Videos aus Mediatheken zu downloaden. Das funktioniert für die ZDF Mediathek, Hulu und mehr. Eine kurze Recherche bei...
by sesam
Fri May 03, 2013 7:55 pm
Forum: General discussion
Topic: Ruby/Rails and the Pi
Replies: 5
Views: 3225

Re: Ruby/Rails and the Pi

Thanks for the explanations. Appreciate it. I will look through the code and try to get to know the basic idea behind it. As I was trying to understand the basic workflow using Rails, I have discovered some tutorials and explanations how to setup a blog and deploy to Heroku. Maybe it's useful to you...
by sesam
Fri May 03, 2013 12:35 pm
Forum: General discussion
Topic: Ruby/Rails and the Pi
Replies: 5
Views: 3225

Re: Ruby/Rails and the Pi

Happy to hear !
by sesam
Fri May 03, 2013 11:59 am
Forum: General discussion
Topic: Ruby/Rails and the Pi
Replies: 5
Views: 3225

Re: Ruby/Rails and the Pi

Interesting !

I also installed Ruby via RVM for some real-time interface for Munich's public transportation service:
https://github.com/rmoriz/mvg-live

I think the opportunities are amazing.

Since I am really a noob on Ruby, can you explain a little bit what gems you are using for this blog ?
by sesam
Mon Apr 29, 2013 6:39 am
Forum: Beginners
Topic: Difference of using Putty and VNC
Replies: 3
Views: 785

Re: Difference of using Putty and VNC

Thanks for the reply, Trev. The explanation lies within the difference of using a login-shell (Putty) or a terminal (via VNC). In the first case, the ~/.bash_profile is used, in the latter, the ~/.bashrc is used. Only the ~/.bash_profile has had the necessary line which initializes Ruby Version Mana...
by sesam
Sun Apr 28, 2013 8:04 pm
Forum: Beginners
Topic: Difference of using Putty and VNC
Replies: 3
Views: 785

Difference of using Putty and VNC

Hi, I am new to this Forum and new to this sweet little Raspberry. Unfortunately I have an issue, where I could need some advice. I'm using my RPi sometimes via Putty/SSH and sometimes via VNC. I installed Ruby via RVM: http://jason.whitehorn.ws/2013/02/26/ruby-2-0-on-the-raspberry-pi and some gem: ...

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