USomIQ SOM can have 128GB of SLC NAND flash, but it will be rather expensive due to high price of such NAND chips. However, with SLC you will not care about data lost because Micron SLC NAND stands for more than 100k of write cycles into a single cell
Отправлено с iPad > 13 июля 2015 г., в 20:54, William Hermans <[email protected]> написал(а): > > Speaking of sealed case, and heating issues. Why not fill the area where the > BBB will sit with non conductive oil ? No idea if this is being done > "professionally" but it's been done with PC motherboards before . . . > >> On Mon, Jul 13, 2015 at 8:42 AM, CEinTX <[email protected]> wrote: >> Otto, >> >> This will prove to be an interesting challenge for you. >> To handle your environments, you will likely need to enclose whatever board >> you choose in an IP67 or Nema 4 sealed enclosure. I don't think potting >> or conformal coating will suffice if you have salt and/or potential for >> condensing >> humidity. Serviceable contacts will eventually corrode (Power, Enet, uSD, >> etc...) >> >> So when you enclosure your board you will have the potential to exceed the >> 70*C >> inside the enclosure. Ambient plus the thermal load of the board. >> So, unless you use some form of active cooling transfer - not sure that will >> help with >> the condensing humidity or the saline. If you use thermo-electric (peltier) >> you damn >> better make sure you get 100% sealing or you will condense on your internal >> heat(cool) >> sink and eventually your enclosure will fill (been there done that). If you >> are not 100% >> sealed, thermal cycling will pull moisture in - condense on the heat sink >> and fill the enclosure >> Until something if not everything fails. >> >> So you will likely need industrial (+85) if not automotive (+105) temp >> components - probably will need >> testing to determine which will be needed. >> >> Next, I haven't heard of 128GB uSD cards being supported on BBB. I'm sure >> the community will chime >> in on that one. So you will likely need a bank of FLASH memory. Or create a >> process that will fill what >> you have/put on the board and periodically download/stream to a server or >> the like. >> >> The IP67 or Nema 4 case will aid in longevity and reliability except in the >> regards of heat. >> Use the appropriate connectors to get you network and power inside and all >> should be good. >> >> There are likely other systems out there that can potentially handle this. >> You'll just have to do research. >> >> Alternately CircuitCo or some other companies can do a custom version of the >> BBB that >> can meet your needs. >> >> I could even do this as I've done an industrial temp version of the BBB >> customized for my >> company's needs - just not sure if I'll have time to do it. It could >> potentially be modified >> to meet your memory needs. So as long as you don't need functioning in temps >> above >> +85*C a variation of it could work for you. >> >> If you decide you want/need a custom board and are not going to do it >> yourself, please give >> CircuitCo the 1st chance at this since they do so much to support this >> community. >> >> Best of luck to you in your endeavor, >> Matt >> >>> On Monday, July 13, 2015 at 9:10:10 AM UTC-5, [email protected] wrote: >>> Hi all! >>> >>> I'm working for a wind turbine manufacturer, and I want to set up a >>> super-robust data acquisition system. Basically it needs to: >>> >>> - receive about 200 channels, single precision, 10-50 Hz through wired >>> network >>> - store data for some time (I need about 128 GB storage ideally) >>> - process it into secondary (much smaller) data summaries >>> - and then the data summaries will be transferred over the wind farm >>> network. >>> >>> Although it will be installed inside the turbine, conditions are still >>> harsh: >>> >>> - Temperatures may range from about -20 to +70 C >>> - condensation/humidity may be an issue >>> - offshore use is also planned so salinity could be an issue. >>> >>> Lifetime should be long, say 10 years, with no/very few manual >>> interference. I want to have about 2000 units in the next year. >>> >>> What do you think, will the BBB be an option for this task? Is airtight >>> (and pressure resistant) casing available to avoid >>> condensation/humidity/salinity issues? Is a micro SD card robust enough >>> when inside this airtight casing? >>> >>> If the BBB is too hobbyist for my purpose, do you know a more robust system >>> that I could use? >>> >>> Thanks for the help! >>> >>> Otto >> >> -- >> For more options, visit http://beagleboard.org/discuss >> --- >> You received this message because you are subscribed to the Google Groups >> "BeagleBoard" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> For more options, visit https://groups.google.com/d/optout. > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. 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