Posted 07 April 2014 - 06:13 PM
Posted 07 April 2014 - 07:06 PM
Posted 26 May 2014 - 10:05 AM
This board compute board is a repackaging which doesn't address any of these points. I am seriously looking at the BeagleBone Black which I feel addresses all of these points, and is available through RS etc at only a little more cost, but rather than discuss pros and cons here, this Maker Corner blog post does a better job: Choosing between the Raspberry Pi or BeagleBone Black
Edited by TerryE, 26 May 2014 - 10:05 AM.
Posted 26 May 2014 - 11:06 AM
i) Unfortunately the blog is out of date. Broadcom released a lot more info a month or so ago, take a look at http://www.raspberry...from-broadcom/. There are still chunks of the multi-media processor that are undocumented (HDMI etc) but nothing that is likely to be an issue for general IO handling.
ii) The Pi scales from very slow up to around 1GHz in "turbo mode", personally I'm far more interested in low power consumption than high performance for the applications I am using it for. I don't think the BeagleBone Black is much faster, you probably need to be looking elsewhere if you need serious performance.
iii) Whether this is an issue depends very much on your target application, I certainly wouldn't want to be running full fat Ubuntu on a data acquisition board. I tend to run a stripped down Debian variant with all access via SSH (no graphics).
Posted 26 May 2014 - 12:13 PM
Power consumption of all the nodes involved here, mains or battery powered, is too low for me to easily measure in the field; data is being gathered by my ~4W SheevaPlug (no graphics, SSH access, powered off-grid with PV).
Edited by DamonHD, 26 May 2014 - 12:14 PM.
Posted 26 May 2014 - 02:22 PM
It's great to have such a wide choice at the moment, a few years ago there was almost nothing affordable in the market.
Posted 26 May 2014 - 03:30 PM
Posted 26 May 2014 - 03:46 PM
I also agree that for this sort of app, keeping the control device pretty lean is the best way to go.
It is the integration with all of the instrumentation and controls that going to be the main complicating factor, as I see it, so sticking an Arduino setup in might be a good option as both Damon and you suggest.
@Damon, BTW, I had a look through your www.earth.org.uk site. What great resource!!! Thanks for this.
Posted 26 May 2014 - 04:20 PM
The main plus see with the graphics core now being documented is that it opens up the Pi to (some) DSP applications. There is already a good FFT library available, general purpose filters should be following soon.
Posted 23 June 2014 - 04:51 PM
Will also order the DIMM board kit when RS has helped me out on a few technical queries.
I have to put some kind of battery-backed RTC (Real-Time Clock) on there for my purposes, so have splashed out about a tenner on one of those.
A nice 128GB SD card to get all my file systems on to is going to cost many time the RPi itself though!
PS. Was a bit of a flashback sitting with it plugged into the family TV to set up, though this time with my kids not my parents!
Edited by DamonHD, 23 June 2014 - 05:43 PM.
Posted 23 June 2014 - 05:33 PM
I know exactly what you mean - This time it was the Pi plugged into my 50 inch Sony flat screen, 33 years ago it was my home built ZX81 plugged into my dad's rented Rediffussion.
Edited by Alphonsox, 23 June 2014 - 05:33 PM.
Posted 14 July 2014 - 07:21 PM
I use it to log the data from my CurrentCost Envi, which I power off the Pi's 3.3V pin.
Other things I have done are running some 1-wire temp sensors, some DHT11 temp/RH sensors, my LabJack U3HV (powered from the USB). Made a timelapse camera, a wireless print server and an RC logger (thats Resistance/Capacitance not Radio Control).
I have used it as a media centre, but just never used it enough, worked well though.
The two main criticisms I have of the Pi are the lack of a real time clock and analogue ports (hence the LabJack and the RC logger).
Oh and the lack of USB ports.
I found a useful bit of software called Win32 Raspbian WiFi Injector, allows the SD card to have your network/router settings written to it before first boot, can run it headless from the start then, no playing about with messy cables.
I still find Linux, especially from the command line, a game of pure luck though. apt-get autoclean is useful.
Edited by SteamyTea, 14 July 2014 - 07:22 PM.
Posted 14 July 2014 - 07:38 PM
That's my main issue, but I am typing this on a Linux laptop. On the plus side, on higher end machines Linux starts in a couple of seconds and is very much faster at everything than Windows (although this is a reasonably quick i7 machine, so probably overkill for running Linux Mint).
Posted 14 July 2014 - 07:58 PM
And I wish Calc in Libra Office used the same keystrokes as Excel when it comes to doing relative referencing and array calculations. Though that is not really a Linux issue.
The file structure is dreadful to an old DOS user, does it really need so many partitions and oddly named directories. I know some of it was done for security/reliability reasons, but for a user that is transferring over it is really confusing.
Posted 14 July 2014 - 08:05 PM
Posted 14 July 2014 - 11:59 PM
I have one one order to save me hacking off the linear reg on a normal model B.
Plus I got my high-side power monitor working, though measuring the SheevaPlug rather than itself for now:
PS. Historical accident? B^|> The *nix command line is still much as it was when I first ran across it not quite 30 years ago. tar tvf and ps [-]guaxww and for f in u mate; do it; done are just as pertinent as they were then!
Edited by DamonHD, 15 July 2014 - 12:05 AM.
Posted 15 July 2014 - 11:16 AM
Lower power, more USB, More GPIO, micro SD, decent mount holes
In case anyone has been waiting to take a plunge into Pi land Aria are selling off their model-B boards for £18.
Edited by Alphonsox, 15 July 2014 - 11:16 AM.
Posted 15 July 2014 - 02:49 PM
A good book on Python and C may be useful though