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    Raspberry Pi anyone?

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    david f
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    Raspberry Pi anyone?

    Post  david f on Thu Mar 01, 2012 2:08 pm

    Worth keeping an eye on this. The first small (credit card), powerful, low power consumption and cheap(£21) computer which would fit easily in one of our submarines.

    Active sonar pond mapping anyone?
    Intelligent underwater video - pattern recognition?

    It already has an interface board available for motors etc.

    Speaks Linux.

    Apparently the Farnell site crashed yesterday because of demand but I have registered my interest.

    David

    nigele(ADMIN)

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    Re: Raspberry Pi anyone?

    Post  nigele(ADMIN) on Thu Mar 01, 2012 3:16 pm

    I saw that on tv last night, David...a remarkable piece of kit. I wonder if it would interface with a smartphone?



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    david f
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    Re: Raspberry Pi anyone?

    Post  david f on Fri Mar 02, 2012 4:57 pm

    I suspect so? You going to phone your sub or is it going to "phone home"?

    David

    david f
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    Re: Raspberry Pi anyone?

    Post  david f on Tue May 29, 2012 6:46 pm

    Well my Raspberry Pi has finally aririved after many months.
    First impressions are very good. Fast, works straight out of the box and only £24.

    This message has of course been posted using it!

    The only problem is a crick in the neck from gazing up at very old telly on the wall which I am using as a monitor!

    David

    nigele(ADMIN)2
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    Re: Raspberry Pi anyone?

    Post  nigele(ADMIN)2 on Tue May 29, 2012 7:16 pm

    I was thinking of getting one but I was told that it won't interface with a dumb ass,!!!!!

    david f
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    Re: Raspberry Pi anyone?

    Post  david f on Wed May 30, 2012 8:43 am

    Actually if you want a simple guide (and you don't mind swallowing your pride enough to take advice from a teenager!) Have a look at:


    http://www.youtube.com/watch?v=28CqDKjtppg

    (The last bit of the tutorial covers setting up the initial passwords and the Graphical User Interface in (Debian) Linux - which is the only tricky bit in the setup process.)

    David

    PS I would say that buying a Pi would be a cheap route for any one wanting a home computer (So that you can browse this Forum) but the £24 is only part of the cost you also need a mouse, keyboard and a router. )(and a TV)

    david f
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    Re: Raspberry Pi anyone?

    Post  david f on Wed Aug 15, 2012 2:42 pm

    The Raspberry Pi is moving on well. Freely available now and lots of projects associated with it.

    I'm afraid that mine is now just hanging off the main television as a media player (For iplayer etc.) but at a moments notice I could start programming (If we aren't watching television!)

    To get an idea of what is happening have a look at this:

    http://www.themagpi.com/#

    Have a read of issue 4 of the free online magazine.You will see an article on attaching an accelerometer (that's not many steps away from level control on a submarine) and also the interesting fact that the next (simpler, cheaper) model of the Raspberry Pi will only draw 200mA (So even better for use in a submarine.) A camera is also coming within the next 3 months.

    The current model draws 700mA which is still OK.

    David

    david f
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    Re: Raspberry Pi anyone?

    Post  david f on Wed Aug 22, 2012 9:27 am

    http://youtu.be/a234ivx7LDE

    Now sonar anyone?? Wonderful stuff!

    David

    david f
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    Re: Raspberry Pi anyone?

    Post  david f on Wed Jan 23, 2013 10:48 am

    Just a quick heads up on my progress with the Pi. (I have had a good play over Christmas because my second Pi arrived just before Christmas. The first one is now permanently hanging off our TV providing iplayer etc.)

    I have now got the following bits of hardware plugged in and working:

    A 16x2 LCD display. (I see that others are starting to use small 3.5inch screens (Used for car reverse cameras and about £20. May be a better bet.))

    A Webcam (VX800).

    (At this point I took a phone call from Trevor (Thank you Trevor - good to speak!)

    A Velleman P8055 board which plugs into the USB port and provides digital and analogue input and output.

    A wifi USB dongle.

    Car charger by USB

    I run the Pi on a network using remote access from a laptop (using Putty and VNC software. This works well and avoids needing a separate monitor and keyboard.)

    I am not quite sure where it is all heading though! What we have is a very, small and cheap (About £25)computer with low power consumption. Has to have some use in submarines!!??

    I am still a little bit limited by my lack of know how in Linux and Python language.

    Crossie
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    Re: Raspberry Pi anyone?

    Post  Crossie on Wed Jan 23, 2013 10:23 pm


    Hi David,
    Raspberry and all the other flavours of pie I understand completely, and having done as you suggested in your post of Aug 15 I've got some idea of what this collection of electronic components does, though as a seasoned eBay buyer would have thought that a £25 computor could be got by an easier method!! Might be useful if linked to gps device you could rig automatic running around the pond!
    Seriously though, as it can be configured as a 3 axis accelerometer that has got to have a use in a boat so I'll be looking into that.
    Further to our conversation this morning I have spent some time toying with the pump it's valve and the other solenoids of which I spoke, and have now destroyed the coil as it will not lift against elevated pressures, ah! the smell of scorched laquer.I tried the pump against a gauge but the range was a bit to high for accurate readings and I think that the output is too low for my projected use, I shall rig up a monometer to measure the pump output accurately and also the 'stall' pressure of the coffee machine solenoid and also the pressure that the valve lifts automatically. Further consideration of the various bits of available kit lead me to think about a gas solenoid valve of the type used in automobile gas conversions, they are available cheaply as new, or even cheaper from the local 'scrappy, and they're 12volts.

    Trevor

    david f
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    Re: Raspberry Pi anyone?

    Post  david f on Sat Aug 17, 2013 10:11 am

    I have just been trying out the new Raspberry Pi camera. (A late birthday present to myself!) It is tiny (about the size of a 2p coin) but has incredible resolution (I think I saw 5 megapixel quoted.) and under £20.

    Some initial sample pics of our garden:

    http://s1079.photobucket.com/user/david_forrest1/library/Photobucket%20Desktop%20-%20SAMSUNG/Raspberry%20Pi%20Camera

    Just the job for underwater camera experiments - I measured  a reasonable 0.25 amps current draw and the whole thing is still the size of a thick credit card.

    I know you can get "spy" type cameras but this is a much more flexible approach (programmable for video/still pictures/intervals etc). You could communicate with it from a laptop for downloads etc. by wifi on the surface.

    Just the job for someone out there trying out cameras for ROVs, I would have thought.

    David

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