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by RomanG
Tue Feb 05, 2013 1:06 pm
Forum: Automation, sensing and robotics
Topic: Driving multiple servos from the RaspberryPi
Replies: 212
Views: 118753

Re: Driving multiple servos from the RaspberryPi

OK I will try that out! I was grounding to battery. What exactly do you mean? Was the battery negative terminal connected to the ground of the RPi (i.e. GPIO pin 6)? Both, the servo ground as well as battery negative must be connected to common ground reference. ... .... ...... I have run update, c...
by RomanG
Tue Feb 05, 2013 4:55 am
Forum: Automation, sensing and robotics
Topic: Driving multiple servos from the RaspberryPi
Replies: 212
Views: 118753

Re: Driving multiple servos from the RaspberryPi

johnnyz77, Just to make sure, is your battery negative terminal also connected to the pi's ground (pin 6 on GPIO header)? If not, then servo circuit may not "see" the signal from the pi correctly, as they do not have common reference. If it is not connected, try to connect it and test again. Just my...
by RomanG
Tue Feb 05, 2013 2:01 am
Forum: Automation, sensing and robotics
Topic: Driving multiple servos from the RaspberryPi
Replies: 212
Views: 118753

Re: Driving multiple servos from the RaspberryPi

Gert van Loo wrote: Also audio, it is something called 'stereo'.
stereo...eh...
Now I feel like an idiot ..... :oops:
by RomanG
Tue Feb 05, 2013 2:00 am
Forum: Automation, sensing and robotics
Topic: Driving multiple servos from the RaspberryPi
Replies: 212
Views: 118753

Re: Driving multiple servos from the RaspberryPi

Hi RomanG, Please can you try the user space implementation of ServoBlaster, invoked as "sudo ./servod --pcm", and report back? It should use the PCM hardware rather than the PWM hardware. In that mode I am able to control servos at the same time as listening to audio via the 3.5mm jack. See the RE...
by RomanG
Mon Feb 04, 2013 4:52 pm
Forum: Automation, sensing and robotics
Topic: Servoblaster interfering with ALSA?
Replies: 1
Views: 1449

Re: Servoblaster interfering with ALSA?

"Mystery" solved. Some explanation here:
http://www.raspberrypi.org/phpBB3/viewt ... 52#p277252

Roman
by RomanG
Sun Feb 03, 2013 11:18 pm
Forum: Automation, sensing and robotics
Topic: Driving multiple servos from the RaspberryPi
Replies: 212
Views: 118753

Re: Driving multiple servos from the RaspberryPi

Hi rgh, Thanks for the explanation, that makes sense. I read the README file and you are right, it mentions that the driver uses DMA channel 0, and PWM channel 1, but I did not know that the servoblaster uses the same hardware PWM as audio. There are two PWM channels on the chip, not sure what the o...
by RomanG
Sun Feb 03, 2013 4:57 pm
Forum: Automation, sensing and robotics
Topic: Driving multiple servos from the RaspberryPi
Replies: 212
Views: 118753

Re: Driving multiple servos from the RaspberryPi

Anyone experiencing servoblaster interfering with ALSA?
More details here:
http://www.raspberrypi.org/phpBB3/viewt ... 19&start=0

Roman
by RomanG
Sun Feb 03, 2013 4:34 pm
Forum: Automation, sensing and robotics
Topic: Servoblaster interfering with ALSA?
Replies: 1
Views: 1449

Servoblaster interfering with ALSA?

I have experienced strange issue. After recent system upgrade to: uname -a Linux RPi 3.6.11+ #362 PREEMPT Tue Jan 22 14:52:21 GMT 2013 armv6l GNU/Linux my audio (through an on-board audio jack) stopped working. There would be just static, even if nothing is playing, and when I would attempt to play ...
by RomanG
Sun Feb 03, 2013 4:03 pm
Forum: Beginners
Topic: SD image too big for another SD Card
Replies: 48
Views: 154740

Re: SD image too big for another SD Card

I run in to similar problem, I had a backup image with older kernel and needed to restore it so that I could troubleshoot ALSA issues. The problem was that the other 4GB SD cards that I have were slightly smaller than the one from which the image backup was made. The original card had size of 3965MB...
by RomanG
Tue Jan 22, 2013 1:16 pm
Forum: Other projects
Topic: Interested in a 17"LCD display for Raspberry, for $45-$50?
Replies: 3
Views: 1915

Re: Interested in a 17"LCD display for Raspberry, for $45-$5

Just a quick update, if you want to estimate shipping cost:
box dimensions 18"x17"x7"
weight 11lbs
it will be shipped from Canada, postal code K4A 0E7

Cheers,
Roman
by RomanG
Sat Jan 19, 2013 10:32 pm
Forum: Automation, sensing and robotics
Topic: Relay Monitoring - Advice?
Replies: 10
Views: 3861

Re: Relay Monitoring - Advice?

Did you pick your relays yet? Many relays have set of auxiliary contacts that can be used to monitor their state. They are switched along with main contacts, but are independent so you can use them to switch 5VDC or 3.3VDC, whatever is Raspberry Pi (or your circuitry) comfortable with. You can have ...
by RomanG
Sat Jan 19, 2013 10:15 pm
Forum: Other projects
Topic: Interested in a 17"LCD display for Raspberry, for $45-$50?
Replies: 3
Views: 1915

Re: Interested in a 17"LCD display for Raspberry, for $45-$5

I posted pictures of the screen on my web site: http://www.cncwings.com/LCD-17.html You will need an HDMI <--> DVI adapter, which not included, as well as HDMI cable, which is also not included. Alternatively, you can get an HDMI <--> DVI cable, that works too. I have about 10 of these display (and ...
by RomanG
Sat Jan 19, 2013 9:06 pm
Forum: Other projects
Topic: Interested in a 17"LCD display for Raspberry, for $45-$50?
Replies: 3
Views: 1915

Interested in a 17"LCD display for Raspberry, for $45-$50?

OK, trying again, first time I forgot to put a question mark on the end of the post subject, so it looked as if I was looking for a display where in fact, I am offering one (ore several if there is an interest). I wonder if anyone would be interested in 17"LCD display for Raspberry Pi, priced at aro...
by RomanG
Fri Sep 14, 2012 10:51 am
Forum: Other projects
Topic: Photo keyring as screen
Replies: 144
Views: 42975

Re: Photo keyring as screen

The solution is in your error message. You are missing library libpython2.6
Just run

Code: Select all

apt-get libpython2.6 install 
and try again.
Roman
by RomanG
Tue Sep 04, 2012 6:33 pm
Forum: Automation, sensing and robotics
Topic: recomended expansion board to control DC and servos?
Replies: 5
Views: 2520

Re: recomended expansion board to control DC and servos?

Try servoblaster mentioned in this post http://www.raspberrypi.org/phpBB3/viewtopic.php?f=37&t=15011&p=163822&hilit=servoblaster#p163822 It works quite good actually, can control up to 8 servos. To control DC motor with servoblaster, you can use ESC (Electronic Speed Controller) for RC models. They ...
by RomanG
Fri Aug 17, 2012 12:18 pm
Forum: Other projects
Topic: Photo keyring as screen
Replies: 144
Views: 42975

Re: Photo keyring as screen

I put together very crude script that pulls everything together and installs build 1184 of lcd4linux with mpd plugin. Also includes patch that fixes libdpf dependency and timer issue and provides scalable fonts on AX206 based frames. More information here http://forum.doozan.com/read.php?9,2435,9323...

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