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by bjs
Tue Jul 03, 2012 4:19 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Arduino IDE
Replies: 1
Views: 1835

Arduino IDE

I'm trying to talk to an Arduino Duemilanove from my RPi running Debian Squeeze. I have installed the Arduino IDE and connected via USB.The Arduino board is powered and is recognized as /dev/ttyUSB0 but in the IDE the serial port menu item stays greyed out and when I start the serial monitor it show...
by bjs
Thu Jun 07, 2012 9:16 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Concurrent processes/threads
Replies: 4
Views: 2810

Re: Concurrent processes/threads

Thanks for your prompt reply Gert. I don't think I phrased my question very well. If I want to have virtual instruments like an oscillator and and data-logger I would presume that the software that implements each instrument would have to run as a separate process or thread, even though the GPIO is ...
by bjs
Wed Jun 06, 2012 6:22 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Concurrent processes/threads
Replies: 4
Views: 2810

Concurrent processes/threads

Hi guys,

Can anyone tell me if it will be possible to run concurrent processes or threads with the GPIO? What I have in mind is to run a sine wave oscillator via a DAC on one process and have an ADC as another process to log circuit response etc. I could then build some virtual instruments.
by bjs
Sat Jun 02, 2012 6:55 am
Forum: Python
Topic: Double click to run
Replies: 10
Views: 3567

Re: Double click to run

In Debian Open the file manager and click on the Edit menu: Edit/Preferences/Genera/Behaviour. The first item should be unchecked to allow double clicking to open files. I have not checked if this works elsewhere than just the file manager but it shows that the Debian setup supports double clicking....
by bjs
Thu May 31, 2012 9:29 am
Forum: Troubleshooting
Topic: Logitech webcams
Replies: 12
Views: 10695

Re: Logitech webcams

I have not tried to use a webcam with my RPi yet but I had a similar problem with Ubuntu on my Dell laptop. It turned out that not all CCD chips in webcams are supported by the Linux drivers. I bought 3 cheap webcams from a supermarket and found that one worked and the others did not. Before you get...
by bjs
Thu May 31, 2012 6:34 am
Forum: Python
Topic: Scientific Python
Replies: 20
Views: 8411

Re: Scientific Python

Hi, I'm very interested in this. The combination of the GPIO capabilities of the RPi and the scientific programming of Python, SciPy, Numpy etc. means that you have virtually got a laboratory in a box. That means an enormous opportunity for science teaching at very little cost. I'm thinking along th...
by bjs
Thu Mar 15, 2012 6:48 am
Forum: Other projects
Topic: Digital Geology
Replies: 52
Views: 10516

Re: Digital Geology

<t>Thank you RMW5. Its clear that the market is developing very rapidly for mobile and other embedded devices so the range of choice open to us is is going to grow. At some time I will have to make a firm choice and compromise between the various competing options. Things like size, weight, view-abi...
by bjs
Tue Mar 13, 2012 8:02 am
Forum: Other projects
Topic: Digital Geology
Replies: 52
Views: 10516

Re: Digital Geology

<t>poing said: <br/> <br/> <br/> <br/> What you do (from the LAMP installation) is use the Apache webserver on the Pi to serve webpages that contain a mix of html and php code, while all you put into the system is recorded by the MySQL database. This is the basis of 75% of the Internet so it's extre...
by bjs
Mon Mar 12, 2012 6:10 pm
Forum: Other projects
Topic: Digital Geology
Replies: 52
Views: 10516

Re: Digital Geology

<t>Its nice to kick ideas around but I'm getting the feeling that I'm getting in over my head with a lot of the computing. I still only have a vague idea of what software is going to be needed to get things talking to each other. I know I've got a lot to learn but at the moment I'm not sure what. It...
by bjs
Mon Mar 12, 2012 6:02 pm
Forum: Other projects
Topic: Digital Geology
Replies: 52
Views: 10516

Re: Digital Geology

<t>winwaed said: <br/> <br/> <br/> @bjs The magnetometer looks like it could be a possible peripheral project.<br/> <br/> re. geophones: After seeing the seismometer thread I went looking online and someone had some used ones for sale - they were using them as a hobby seismometer (local earthquakes ...
by bjs
Mon Mar 12, 2012 5:52 pm
Forum: Other projects
Topic: Digital Geology
Replies: 52
Views: 10516

Re: Digital Geology

<t>@poing,<br/> <br/> I'm not sure that this will be any good for me since I can't guarantee being able to access the web in the field. Mobile phone coverage is patchy out in the sticks particularly in mountainous country. Or have I misunderstood what you are proposing? Do you mean a local connectio...
by bjs
Mon Mar 12, 2012 5:27 pm
Forum: Other projects
Topic: Linux device drivers for Rapberry Pi on-board I/O
Replies: 97
Views: 42521

Re: Linux device drivers for Rapberry Pi on-board I/O

I don't know yet what drivers I'm going to need but this is fantastic stuff; keep it up!
by bjs
Mon Mar 12, 2012 11:21 am
Forum: Other projects
Topic: Digital Geology
Replies: 52
Views: 10516

Re: Digital Geology

<t>poing said: <br/> <br/> <br/> Interesting discussion. I have no knowledge in the geology field but I have some experience with cheap Android devices. One important thing: forget seeing anything on the screen in daylight <br/> <br/> <br/> <br/> Yes that's a worry. Its why I was thinking about the ...
by bjs
Mon Mar 12, 2012 11:11 am
Forum: Other projects
Topic: Digital Geology
Replies: 52
Views: 10516

Re: Digital Geology

@error404

Many thanks for putting me right. One of my main reasons for playing with the RPi is to try to learn something about drivers and the kernel
by bjs
Mon Mar 12, 2012 8:22 am
Forum: Other projects
Topic: Digital Geology
Replies: 52
Views: 10516

Re: Digital Geology

<t>Jim Manley said: <br/> <br/> <br/> There are a number of USB-wired and Bluetooth wireless external GPS "pucks" designed for use with laptops for recreational aviation and off-road vehicles that provide more accurate position and elevation data than smart phones and tablets for as little as $35 (m...
by bjs
Mon Mar 12, 2012 8:06 am
Forum: Other projects
Topic: Digital Geology
Replies: 52
Views: 10516

Re: Digital Geology

<r>@Winwaed<br/> <br/> Don't worry about digressing. At this stage in the game, i.e. waiting for RPi, its good to think laterally about what can be done. The open source movement has always had the concept of re-usability so designing something that can be used for many different applications is bet...
by bjs
Sun Mar 11, 2012 2:18 pm
Forum: Other projects
Topic: Digital Geology
Replies: 52
Views: 10516

Re: Digital Geology

<t>RMW5 said: <br/> <br/> <br/> @bjs<br/> <br/> A few years, I would have said that the solution would have been to build your small handheld sensor device and link it via bluetooth to an iPaq PDA or similar with a 3x5 inch screen and a few gigabytes of storage on an SD card, but the PDA alone would...
by bjs
Sun Mar 11, 2012 9:26 am
Forum: Other projects
Topic: Mini oscilloscope ?
Replies: 11
Views: 11259

Re: Mini oscilloscope ?

<t>Hi Will,<br/> <br/> I was not thinking of competing with CERN and as I said it depends what you want to use the scope for. I was thinking more in terms of A-level students or people who have just got interested in physics. The market for general science books is huge and there are lots of amateur...
by bjs
Sun Mar 11, 2012 8:19 am
Forum: Other projects
Topic: Mini oscilloscope ?
Replies: 11
Views: 11259

Re: Mini oscilloscope ?

<t>I have been thinking about how to use the RPi in the lab. The building of apparatus seems to have slipped out of the physics curriculum at schools and Universities but its the thing that many real scientists spend most of their time doing. You can do an awful lot just with audio frequency bandwid...
by bjs
Sun Mar 11, 2012 7:44 am
Forum: Other projects
Topic: Digital Geology
Replies: 52
Views: 10516

Re: Digital Geology

<t>RMW5 said:<br/> <br/> <br/> "Out of interest, why do you need the accelerometer and the digital compass? I assume that you want an accurate (1 degree) non-GPS compass.  Between them they would take out $50 of your $100 budget and the USB/wired GPS unit would probably be another $30-40.  A small H...
by bjs
Sun Mar 11, 2012 7:09 am
Forum: Other projects
Topic: Digital Geology
Replies: 52
Views: 10516

Re: Digital Geology

<t>@Winwaed<br/> <br/> @error404<br/> <br/> @RMW5<br/> <br/> Android Tablets etc.<br/> <br/> I thought about this some time ago. My Android htc hero has compass, clinometer, gps and camera apps but they don't seem to be very good. I don't know if this is due to poor sensors or poor software. Its jus...
by bjs
Sun Mar 11, 2012 6:54 am
Forum: Other projects
Topic: Digital Geology
Replies: 52
Views: 10516

Re: Digital Geology

<t>@Winwaed<br/> <br/> @tech_Monkey<br/> <br/> It occurred to me this morning that what I am proposing is really a generic Portable-Pie that can be used for any kind of field logging application with appropriate sensors. So it could be used for biology or hydrology with a pH or ion sensors or for ge...
by bjs
Fri Mar 09, 2012 6:08 pm
Forum: Other projects
Topic: Digital Geology
Replies: 52
Views: 10516

Re: Digital Geology

<t>Thank you for your helpful thoughts.<br/> <br/> GIS systems are certainly memory hogs but that's way down the line at the moment.<br/> <br/> What I have in mind is mapping an area of about 1km x 1km which is about the amount of work that an average student can manage in a weekend. So we are talki...
by bjs
Fri Mar 09, 2012 4:58 pm
Forum: Other projects
Topic: Digital Geology
Replies: 52
Views: 10516

Re: Digital Geology

<t>JamesH said: <br/> <br/> <br/> Bluetooth and GPS should be no problem if you are OK with USB dongles - bluetooth we know works, and I almost got GPS working some time ago, but ran out of time. Bluetooth dongle was about £5, and the GPS dongle was £16.<br/> <br/> <br/> <br/> I am ashamed to admit ...
by bjs
Fri Mar 09, 2012 9:02 am
Forum: Other projects
Topic: Digital Geology
Replies: 52
Views: 10516

Re: Digital Geology

<t>I'm a retired Earth Scientist and I now work with amateur geologists and OU students trying to get them going on things like geological mapping. The way professionals, like the British Geological Survey, work in the field these days is using ruggedized tablet computers and commercial software. Un...

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