Raspberry PI B 2 light sensitivity hardware bug
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May 5, 2015 at 12:27 am #701182
I’d read about this bug on the tech websites a few months ago; but wasn’t sure if it was still present in more current models (it is).
Those who are of a certain age group with some electronics knowledge (i.e Sinner, Angel and Pat) might understand the reasoning behind the choice of music the RPI is playing and the contents of the Radiospares (RS) components bag 😉 ; if no one else works out the second bit I’ll explain later today.
This isn’t a disaster as its a known flaw and can be worked round by using an opaque enclosure. I’d got the model 2 to use as a development environment to try and learn some C and ARM assembler as I’d rather work with Linux than try and remember how RISCOS operates from 25 years ago but just as well I tested it as I’d had plans to use a second one at work to control an arduino as part of an embedded signal for some LED lamps (that signal important warnings).
that code will most likely be in Python anyway and I’m building a watchdog alarm into it; the newer PI will instead be used to play back Radio Caroline (but may have spare capacity for other stuff.May 5, 2015 at 2:10 am #973922
Good news – there have been better designs made for PI boxes.
Most of the ones I’ve seen 3D printed have been awful. This one’s both good looking and robust enough for use.
PM me if you want one and can’t find a local maker to squirt one out for your (ooooh, young man…)May 7, 2015 at 10:31 am #973920
Thanks for the offer Pat – although this one (and/or its PSU) also chuck out as much RF interference as computers did 35 years ago.
once I am done with stuff for the day job (some of which has been as surreal as a Jackie Chan movie, albeit thankfully with less violence and injuries) the whole thing may well end up being put into a plain opaque plastic case (to avoid short circuits etc. GPIOs brought out via a custom circuit with those optos (as I have done for the PI that generates a clock display); and that put into a good solid enclosure of British steel and some of the metal sheet with holes in it for ventilation, solidly bonded by a brass terminal to frame/protective earth. Some of us old-timers still like to listen to analogue radio whilst we do our other work/experiments with computers 😉May 7, 2015 at 10:08 pm #973923
@General Lighting 702232 wrote:
a good solid enclosure of British steel and
Surely some mistake. There is no British steel anymore. Unless you are getting a one off from Sheffield Forgemasters or similar… and no steel is actually made from UK materials anymore. Sorry guv, you missed the boat.May 10, 2015 at 1:09 am #973921
@Pat McDonald 702237 wrote:
Surely some mistake. There is no British steel anymore. Unless you are getting a one off from Sheffield Forgemasters or similar… and no steel is actually made from UK materials anymore. Sorry guv, you missed the boat.
interesting link – I did wonder about this when all sorts of metal was being nicked round here (street signs, drain grid covers etc) as scrap for the “Chinese” but had mistakenly assumed these Chinese were in somewhere like Sutton Coldfield instead of mainland China, and it got melted down up North and reused in Blighty.
I suppose I could make the case from China steel; then embed British small aggregate etc to it like some kind of medieval or middle ages contraption (or the rock thing that the Secret Intelligence Service left lying about in Russia to send and receive secret messages a few years back) but it would take ages, I’d feel a bit like a hipster doing that, I’d have to avoid blocking the ventilator holes and I think some of those minerals might be to some extent semiconductors that would only cause more RFI and act as a detector for all the rough PSU noise, defeating the object of the earthed enclosure.
That said, surely not all the components on the RPI are from Wales and it still “made in UK”?May 11, 2015 at 12:15 am #973924
… from components from outside the UK, yes. I reckon it’s a case of manufacturers can get better ore and coal from outside the UK cheaper. So they do.
Ozzy iron ore is $40 a tonne, it’s a lot cheaper than nicking existing road signs from anybody
Mind you, nothing to stop you flattening some old baked bean cans and using that as a shield. Will probably have some recycled Brit steel in it somewhere.
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