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by davidmam
Thu May 31, 2012 1:32 pm
Forum: Automation, sensing and robotics
Topic: Smart Thermostat
Replies: 35
Views: 28984

Re: Smart Thermostat

The 1-wire sensors work very well with arduino and with the RPi. They are cheap - effectively you are looking at the cost of 2 or 4 core cabling to the relevant places.

I'm interested in the schematics for controlling relays to replace a normal controller clock.
..d
by davidmam
Thu May 31, 2012 1:21 pm
Forum: Automation, sensing and robotics
Topic: Smart front door project
Replies: 11
Views: 11635

Re: Smart front door project

It seems a bit old hat. To get properly up to date you would capture an image of the person at the door, identify them via picasa face detection or a suitable openID login to link identity to a face, and then their access could be controlled remotely. Bar code identification and openID verification ...
by davidmam
Thu May 31, 2012 8:44 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: kernel patch for Dallas 1-wire interface
Replies: 227
Views: 156067

Re: kernel patch for Dallas 1-wire interface

I'm sure someone else will correct me but I would expect it to be 3.3V and a bridging resistor between the data and +ve lines as per the figure at http://www.acmesystems.it/1wire Yet to try this, waiting on a breadboard to prototype with but this would make web based home automation/building monitor...
by davidmam
Wed May 30, 2012 5:34 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: kernel patch for Dallas 1-wire interface
Replies: 227
Views: 156067

Re: kernel patch for Dallas 1-wire interface

This looks great - can't wait to try this out. Just updated the image on the card and when I get home I'll be getting out the breadboard and the temperature sensors..
by davidmam
Tue May 29, 2012 10:23 pm
Forum: Other projects
Topic: Photography Projects
Replies: 150
Views: 66475

Re: Photography Projects

I've been playing with Gphoto2 on the Pi with my D80. There appears to be a bug in gphoto2 where it will not release after writing to the camera via USB. This means that everything works upto and including the first write command, but subsequent commands don't. If you run the shell then you can do m...
by davidmam
Tue May 29, 2012 1:18 pm
Forum: Troubleshooting
Topic: USB causing Pi to hang
Replies: 4
Views: 816

Re: USB causing Pi to hang

OK, having run a multimeter across the Pi it appears that my power supply (an HTC phone charger) is marginal when used with that cable (barely over 4.75V) and this drops to near 4.70 when USB kicks in to talk to the camera. Beefier PSU on order, and I'll try the other cable which gives 4.89V. What w...
by davidmam
Mon May 28, 2012 7:56 pm
Forum: Troubleshooting
Topic: USB causing Pi to hang
Replies: 4
Views: 816

USB causing Pi to hang

I've been trying to use gphoto2 with a USB connected camera. After taking one shot, the USB seems to hang and not allow communicaiton. The Pi then hangs and becomes unresponsive via ssh or other methods. Is this a known problem with USB on the Debian Squeeze kernel? It seems wrong that userland apps...
by davidmam
Mon May 28, 2012 12:05 pm
Forum: Debian
Topic: apt-get issues
Replies: 4
Views: 1501

Re: apt-get issues

OK, reimaged and then ran update (twice) and am now running upgrade. It is entirely possible that something was a bit fubar with the initial image and my sporadic installations since.
by davidmam
Mon May 28, 2012 11:05 am
Forum: Debian
Topic: apt-get issues
Replies: 4
Views: 1501

Re: apt-get issues

Yes the time is right. If it fails during the update then there is no possibility to run upgrade. As I mentioned above, it is failing during signature verification when attempting to load the index files. Is there a way to change the repository used? I'm currently reimaging the card to see whether i...
by davidmam
Mon May 28, 2012 10:11 am
Forum: Debian
Topic: apt-get issues
Replies: 4
Views: 1501

apt-get issues

I'm trying to update/install various packages (primarily to get gphoto running) but it appears the repository is down. I'm using the debian squeeze 19/4 distribution. On running sudo apt-get update I get signature verification errors so the index doesn't update. Is this a known problem? it is an unk...
by davidmam
Tue May 22, 2012 10:00 am
Forum: Other projects
Topic: Photography Projects
Replies: 150
Views: 66475

Re: Photography Projects

You shouldn't need the arduino as the Pi has all the hardware connections you need through the GPIO header to run servos. Using something like motion you should be able to get it to follow subjects as well automatically.
by davidmam
Mon May 21, 2012 9:09 pm
Forum: HATs and other add-ons
Topic: Gertboard vs. Arduino 32-bit Due
Replies: 27
Views: 16412

Re: Gertboard vs. Arduino 32-bit Due

The point of the arduino? It provides a microcontroller in an accessible format that someone with only rudimentary electronics knowledge and a little bit of coding can access. It dramatically lowers the entry level barrier. You may not think that microcontroller processing is hard - but when you are...
by davidmam
Sat May 05, 2012 11:39 pm
Forum: Staffroom, classroom and projects
Topic: Scratch for Control Technology
Replies: 14
Views: 7286

Re: Scratch for Control Technology

<t>I started to look at Squeak, and Smalltalk, and realised very rapidly that the documentation is very muddled between versions and that my brain hasn't yet learned to think that way (or translate the jargon).<br/> <br/> I'd love to be able to e.g. put custom parsers as blocks in Scratch so it can ...
by davidmam
Fri May 04, 2012 11:29 pm
Forum: Staffroom, classroom and projects
Topic: Scratch for Control Technology
Replies: 14
Views: 7286

Re: Scratch for Control Technology

<t>I'm hoping that someone can prove me wrong but I haven't found a way with scratch to be able to get outside the box, ie interact with files or GPIO. I may be completely wrong and I'd love to find a way to include system calls or GPIO reads/writes in Scratch.<br/> <br/> The Picoboards look good so...
by davidmam
Tue May 01, 2012 11:19 pm
Forum: Other projects
Topic: Ultimate camera shutter controler?
Replies: 10
Views: 2867

Re: Ultimate camera shutter controler?

<t>Motion works well. I have used it for bird box cameras before. I'm not sure whether it compiles on the Pi though (probably does)<br/> <br/> Are you planning to use the Pi remotely from the camera or remotely with the camera? I'd imagine a Pi and camera setup shouldn't be too hard to put together ...
by davidmam
Tue May 01, 2012 11:07 pm
Forum: General discussion
Topic: The first ever photo taken by a RaspPi?
Replies: 8
Views: 2786

Re: The first ever photo taken by a RaspPi?

<t>This is cool. It's great to know that gphoto runs just fine..<br/> <br/> I find that running the D80 on tethered mode with Nicon Capture eats battery, I'd imagine the same for gphoto. A web frontend to gphoto would be a great thing to do. Even better would be an android app that lets you adjust t...
by davidmam
Fri Apr 27, 2012 1:12 pm
Forum: Automation, sensing and robotics
Topic: Robot arm: feedback sensory (Skutter v0.2)
Replies: 92
Views: 18524

Re: Robot arm: feedback sensory (Skutter v0.2)

<t>One option for expanding the usability of the GPIO would be to use a PISO (parallel in, serial out) chip to serialise a load of digital inputs. I'm doing this for another (arduino) project where I have an arbitrary number of sensors/values (actually reading counts from a number of counters where ...
by davidmam
Tue Apr 17, 2012 10:51 am
Forum: Other projects
Topic: Photography Projects
Replies: 150
Views: 66475

Re: Photography Projects

<t>I'm keen on this too. Maybe the way to go is to wrap gphoto2 with a web interface and then operate it over the network? That will give something getting close to being equivalent to the new D4 wireless interface..<br/> <br/> Untethered tethered shooting - what is not to like? Add a small portable...
by davidmam
Mon Apr 16, 2012 4:23 pm
Forum: Staffroom, classroom and projects
Topic: Why Pi when you can just run Linux?
Replies: 98
Views: 21658

Re: Why Pi when you can just run Linux?

<t>The real advantage with RPi over just running Linux is the form factor and acessibility to hardware. Ideally a RPi case for schools will expose the GPIO header via a convenient (and protected to prevent bricking of the board) set of connections on the case. This would require an expansion board b...
by davidmam
Sun Mar 11, 2012 1:43 pm
Forum: General discussion
Topic: real world use in Educational establishments
Replies: 8
Views: 1740

Re: real world use in Educational establishments

<r>jmitrun said: <br/> <br/> <br/> Funny what curiouseng just said, I read this this morning:<br/> <br/> <URL url="http://www.ioannes.com/2012/03.....ipe-dream/">http://www.ioannes.com/2012/03.....ipe-dream/</URL><br/> <br/> It says all schools in the west have computers already. Maybe it will end u...
by davidmam
Mon Mar 05, 2012 1:57 pm
Forum: General discussion
Topic: Pre-programmed SD cards?
Replies: 51
Views: 9084

Re: Pre-programmed SD cards?

<t>Chris Rowland said: <br/> <br/> <br/> <br/> The GPL forbids making a profit on the distribution of the OS doesn't it?<br/> <br/> <br/> No, not at all. But if you make the software available (whether at any cost or not), you have to make the source available as well.<br/> <br/> You could offer for...
by davidmam
Sat Feb 25, 2012 11:05 pm
Forum: General discussion
Topic: If Raspberry Pi was made by...
Replies: 21
Views: 4935

Re: If Raspberry Pi was made by...

That is indeed true but it would still be running as it exited the solar system in 2083
by davidmam
Sat Feb 25, 2012 4:55 pm
Forum: General discussion
Topic: There's a little update from Eben on the front page...
Replies: 52
Views: 12407

Re: There's a little update from Eben on the front page...

<t>simonIOW said: <br/> <br/> <br/> I feel a sickday (week) coming on... *cough*<br/> <br/> 10 + 1 != 101<br/> <br/> <br/> <br/> I will be on the train. And then screaming across the smoke to get a train out the other side. I hope I can get a decent mobile broadband connection from the sleeper..<br/...
by davidmam
Sat Feb 25, 2012 12:26 pm
Forum: General discussion
Topic: Another week gone by...
Replies: 14
Views: 3836

Re: Another week gone by...

Tom.Y said:


It would be cool if they released it on March 14th. (3/14) It's Pi day, and all.



Umm.. In UK that would be the end of April.. (there may be a tiny error in there..)
by davidmam
Mon Feb 20, 2012 11:55 am
Forum: Python
Topic: Scientific Python
Replies: 20
Views: 10326

Re: Scientific Python

<t>Being in a bioinformatics lab where most of the people are eagerly awaiting the Pi, we are starting to look at whether we could build a portable DNA sequencer using the new MinIon USB sequencer.. This would have some technical challenges (scaling from our tens of Gb servers and compute cluster to...

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