Viewing 4 posts - 17 through 20 (of 20 total)
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  • #23839
    theremino
    Keymaster

    A seismograph requires a special room, better if underground, and it should also be fixed to a concrete plinth that is insulated from the walls.

    Adding a MiniPC is the least of the problems and the consumption of mini PCs with current CPUs with SSD memories is negligible.
    We are talking about less than ten watts at 5 volt (even under the 3 watt when the CPU works little as it happens during the memorization of the seismic LOGs).

    On the other hand, using a PC provides a convenience unattainable with stand-alone modules, a convenience that is the minimum wage when doing serious research.

    Plus a MiniPC (o tablets) it already has everything you need, audio, power supply, batteries in case of power failure, network card etc.…
    and it doesn't cost much more than an Arduino + power supply + box + vari shield necessary, etc…

    #23844
    ammonia
    Participant

    Ciao,
    speaking in terms of microcontroller, when compared to Arduino and Raspy, in fact the way they were conceived, if I have to put a pc next to it (mini o no) it is still a nice limit for sure.

    I repeat, unfortunately after seeing dozens of projects of this type born and died instantly, or born and not maintained, or get no answer from who started it, it has genuinely demoralized me and made me spend money in vain.
    I am of the opinion that, with respect for people, if you publish something and then one day you discover that you can no longer carry on or follow for all the reasons of this world, it is appropriate to communicate in large letters that the project has been abandoned etc etc, also because a minimum of support is assumed if there is the possibility to ask questions and write comments.

    Theremino I discovered it by chance and it seemed more suitable and professional for the purpose though, I realize that you actually understand what you need, the cost is not so negligible but, what scares me the most is the software, applications and various slots….surely we will have to bang our head a bit even if more than once it has been said that it is not complicated.

    #23846
    ammonia
    Participant

    Ciao,
    today unfortunately in terms of electronics and hardware in general it has become a luxury even just to buy an Arduino or Raspy, everything is weighted in gold…aside from this, my search for a seismograph was geared towards domestic and non-professional use and when you speak that “requires a special room, better if underground, and it should also be fixed to a concrete plinth that is insulated from the walls”, it is a big limitation that, certainly it is a fundamental requirement to have reliable results but, limiting to domestic use if one does not have that possible location.

    In terms of costs, the most demanding part is certainly the minipc, for Theremino and modules I think we are around € 40 including power supply and box to house it.
    For the pre-assembled modules part, to complete the MasterDIL for the seismograph, I saw that the PCB must be ordered separately, where I think you have to solder the LIS344 chip, SMD capacitors and resistors (unless they offer the whole assembled), can you give me further information on this, unfortunately I can't find the module already assembled as for the’ ADXL335 su robot-italy.com.
    Then uploading the PCB file to sites like jlcpcb.com or others, most do not accept the EAGLE format, i only found aisler.net accepting it but, i didn't understand what kind of service it offers sincerely.

    Explanations or indications on the matter?

    #23848
    theremino
    Keymaster

    Power supplies are not needed, the 5 volts of the USB go on and on.
    About the rest you are right, wanting to spend very little I would recommend an Arduino Nano (with CH340 they are better) and some libraries suitable for logging earthquakes. So you could get by with around twenty euros in total. But the performance will be low (also because you are thinking of using an accelerometer instead of a real geophone). And by low I mean that you will only be able to see strong and not too far earthquakes, let's say at the most 50 km.

    To have good performance you need geophones, preferably 3 placed in the three directions, and then it takes a Theremino ADC24 module and a Theremino Master module and finally a MiniPC
    Then 60 + 40 + 20 + 150 = 270 Euro (circa)

    My previous accounts considered trying to get performance from Arduino comparable to our system. Which would have involved using a special and expensive Arduino and quite a lot’ of additional hardware to have decent ADCs, log on to the network etc.… But if you are talking about super savings and you are satisfied with very poor performance then there is no comparison, an Arduino Nano beats everyone. I also often use a Nano in some projects and find it fantastic, extremely easy to program, cheap and also fast enough to do a lot of good things!

Viewing 4 posts - 17 through 20 (of 20 total)
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