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by Fanjita
Tue Feb 05, 2013 4:13 pm
Forum: General discussion
Topic: Order Model A, get a Model B
Replies: 27
Views: 8057

Re: Order Model A, get a Model B

Same thing happened here.

I don't think there's such a thing as a model A box - the only identifying feature on the box I received is a sticker, that seems to have been originally printed as part of the invoice / packing list.
by Fanjita
Tue Jan 08, 2013 9:47 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Warning: Humble Pi v1.1
Replies: 2
Views: 1280

Re: Warning: Humble Pi v1.1

Confirmed on my Humble Pi v1.1 too - I was scratching my head for ages wondering why I could only get serial comms in one direction only. I fixed mine by breaking the TXD trace either side of the short, and bridging with a piece of wire. Works fine now. I'm surprised not to see any mention on Ciseco...
by Fanjita
Sun Jul 29, 2012 4:23 am
Forum: Advanced users
Topic: Raspberry Pi + OpenCV
Replies: 10
Views: 29203

Re: Raspberry Pi + OpenCV

There was talk of the official camera module using some of the GPU acceleration - I think there's a good chance that will have signifcantly improved perf for some of the capture and immediate postprocessing steps. It seems doubtful right now that it will be able to use GPU for subsequent matrix-heav...
by Fanjita
Mon Jul 16, 2012 10:33 pm
Forum: Advanced users
Topic: Raspberry Pi + OpenCV
Replies: 10
Views: 29203

Re: Raspberry Pi + OpenCV

I've been playing a bit with the latest official Raspbian Wheezy image. It's early days, but the stock python-opencv package is at least as performant as the Arch Linux one, which is a relief as I'd been thinking I might need to cross-compile a more recent build of the OpenCV source on Debian Squeez...
by Fanjita
Mon Jul 16, 2012 1:07 pm
Forum: Debian
Topic: Wheezy: Problem with Bluetooth
Replies: 24
Views: 13931

Re: Wheezy: Problem with Bluetooth

Sadly I've seen similar results with cheap bluetooth dongles for a long time when running on Debian-based Linuxes. Occasionally my hardware freezes up hard enough that the dongle needs to be unplugged before the bluetooth stack recovers - I even went to far as to create a custom USB cable that disco...
by Fanjita
Wed Jul 11, 2012 11:11 pm
Forum: Other projects
Topic: PSP Battery?
Replies: 6
Views: 3412

Re: PSP Battery?

The PSP battery is 3.6V, so you'd need a DC-DC converter - see here for some info on how. I'm pretty sure I saw a blog post of someone running a PSP screen from either a RasPi or an Arduino recently, so that would be pretty neat. Ah no - here it is, an FPGA interface , but maybe there's some materia...
by Fanjita
Mon Jul 09, 2012 9:25 am
Forum: Python
Topic: Nokia Pi LCD
Replies: 253
Views: 110196

Re: Nokia Pi LCD

Nice work.

These displays are really easy to pick up cheaply, too - e.g. £7 here. I picked one up a while back, with a vague plan to do something with it : it might make a nice little status display for my Pi.
by Fanjita
Sat Jul 07, 2012 3:47 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: power the Pi from 5V GPIO Pin possible?
Replies: 14
Views: 42244

Re: power the Pi from 5V GPIO Pin possible?

I'm considering the same thing. As I understand it, the 5V pin on the GPIO header connects to the SoC side of the input fuse from the micro USB 5V power input. So, it should be identical to connecting 5V into the USB socket, except that You won't get the benefit of protection from that fuse, so in t...
by Fanjita
Sat Jul 07, 2012 11:13 am
Forum: Advanced users
Topic: Raspberry Pi + OpenCV
Replies: 10
Views: 29203

Re: Raspberry Pi + OpenCV

Performance seems to be very dependent on the camera hardware, and the capture resolution. My best camera gets about 5 frames per second in Arch Linux, at 320x240, which is pretty hopeless. With the stock OpenCV package available via apt for the Squeeze distribution, I'm not able to control resoluti...
by Fanjita
Tue Jul 03, 2012 2:17 pm
Forum: General discussion
Topic: Battery Power/Pack
Replies: 29
Views: 45392

Re: Battery Power/Pack

Here's my comparison of a few different, cheap options for reliable battery power:

http://www.fanjita.org/serendipity/arch ... eries.html
by Fanjita
Mon Jul 02, 2012 11:54 pm
Forum: Automation, sensing and robotics
Topic: Powering Pi with 9.6v 1800mAh battery pack
Replies: 13
Views: 7893

Re: Powering Pi with 9.6v 1800mAh battery pack

For what it's worth, I recently wrote a blog post comparing various battery power options. Hopefully it might be of interest to others browsing this thread - I couldn't find an obvious subforum to post it in.

http://tinyurl.com/cbpu5jo
by Fanjita
Tue Jun 12, 2012 11:44 pm
Forum: Python
Topic: Re: Slice of Pi and blink LED
Replies: 4
Views: 3032

Re: Slice of Pi and blink LED

There is some potential for the Slice Of Pi to move and short against one of the components on the pi, though - I don't have my pi in front of me to check exactly which component that is, but it's in a round metal package. I wound up doing two things to avoid any problems : Put a small sticker on to...
by Fanjita
Mon Jun 11, 2012 11:19 pm
Forum: Automation, sensing and robotics
Topic: OpenCV on the Raspberry Pi
Replies: 30
Views: 18888

Re: OpenCV on the Raspberry Pi

Here's a little glimpse of the sort of thing I'm trying to achieve with this project : http://www.fanjita.org/serendipity/archives/59-The-Raspberry-Rover.html . I made a simple roving robot that uses Hue-Saturation-Value analysis to spot different-coloured objects in the environment, and navigate to...
by Fanjita
Mon Jun 11, 2012 10:03 am
Forum: Raspbian
Topic: looking for in-kind donation of a public server
Replies: 14
Views: 3587

Re: looking for in-kind donation of a public server

For a long time I've used the dedicated root server hosting at www.hetzner.de. Their prices are very low for what they offer, their support is excellent, and their traffic allowances are excellent. If you exceed the traffic cap, then you get throttled to a slower bandwidth - but your service continu...
by Fanjita
Thu Jun 07, 2012 11:36 pm
Forum: Automation, sensing and robotics
Topic: OpenCV on the Raspberry Pi
Replies: 30
Views: 18888

Re: OpenCV on the Raspberry Pi

Can you try the facedetection sample script (on OpenCV sample folder) and tell us about the performance? It's not fast... I'm still using the python bindings, so ported an equivalent version of that sample grabbed from http://blog.jozilla.net/2008/06/27/fun-with-python-opencv-and-face-detection/ (a...
by Fanjita
Thu Jun 07, 2012 10:00 am
Forum: Automation, sensing and robotics
Topic: OpenCV on the Raspberry Pi
Replies: 30
Views: 18888

Re: OpenCV on the Raspberry Pi

I've been preparing an OpenCV python program ready for the pi. The pi arrived and I compiled the uvc video module for my webcam drivers, and the camera is now recognised. However during the program I do a cvqueryframe I just get a seg fault (even with display output turned off. :( Will be seeing if...
by Fanjita
Thu Jun 07, 2012 9:55 am
Forum: Arch
Topic: OpenCV on Arch
Replies: 0
Views: 1007

OpenCV on Arch

Just a quick mention for a series of blog posts I made covering getting a webcam + OpenCV + Python up and running on my Pi under Arch Linux.

I had to cross a few hurdles, so hopefully there's some useful info there for other people.

http://fanjita.org/

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