OK I may be late to the game here. Using a great device to solve my rs232 port problems. Its a did TS serial poer server. They make them in 16 ports and smaller. Essentially it translates the ports to ethernet and everything I have can then use the rs232 devices. The ports stay put unlike USB thats been a pain actually. Multiple workstations and such can access the ports. They can translate say port 16 so that it looks like com3.... First 16 port was free. The 8 ports cost a wopping $5. Nobody knows what these things are so no value. I didn't till I stumbled into 1at work that was getting tossed and the light bulb lit up. Currently integrating them into the systems Good luck Paul WB8TSL
On Sat, Aug 24, 2013 at 7:35 AM, Bob Camp <[email protected]> wrote: > Hi > > On Aug 24, 2013, at 3:27 AM, Hal Murray <[email protected]> wrote: > > > > >> If it were me, I remove the LCD display. I don't see a need when > everyone > >> today has a phone. the little AVR chip can bit-bang a UDP packet once > per > >> second and put it on your wifi router. That cuts the parts cost by > 1/3rd > >> and the display will be where you can see it, on the phone or computer. > > > > There are still a few of us who don't have cell phones. :( > > > > I split the problem into two areas: > > Collecting the data > > Displaying it > > > > If I'm collecting data, I want to be able to look back over hours, days, > > months, or even years. That means I probably want to backup/archive it > too. > > > > 100 characters of text every 10 seconds is under a megabyte per day. > That's > > small relative to modern disks, medium relative to thumb drives or SD > cards > > and small to medium relative to RAM (or ramdisk). [I generally chop > things > > up into a file per day.] > > That's a *lot* more than a simple monitor. Once you get past "simple" you > already have LH and a lot of hardware that will run it just fine. > > Bob > > > > > So far, I've always had a handy Linux box running 24x7 when I wanted to > > collect data, so I've never tried to use a smaller system. Since the > data is > > collected on a real system, it's easy to display it any way I like. > > > > I won't be surprised if a project comes along where I want something > like a > > small uP to grab careful timing data. Until then, I'll keep collecting > my > > data on a real PC. > > > > ------------ > > > > Does anybody have data on lifetime of Thumb/SD cards if you flush a log > file > > every 10 seconds? > > > > What type of file systems are supported with whatever OS comes with small > > uPs? Is there any work on flash-friendly file systems for append-only > log > > files? > > > > A year or 3 ago, I did some work on logging to ramdisk and occasionally > > copying to hard disk. The idea was that the hard disk would be spun-down > > most of the time, saving a lot of power. It didn't save much so I > bailed on > > that project. I assume that means the power to keep the disk spinning > is low > > relative to the power to keep the electronics going. Maybe I just > botched > > the experiment. > > > > > > flushing the file after each line is the simple way to make (mostly) sure > > that your data gets to disk in case the system crashes, but it turns into > > several disk writes each "line". That's no big deal for a lightly loaded > > hard drive but gets interesting in terms of total writes to flash drives. > > > > You could, of course, fix the code to only do the flush once every N > minutes, > > or only when something interesting happens... > > > > > > -- > > These are my opinions. I hate spam. > > > > > > > > _______________________________________________ > > time-nuts mailing list -- [email protected] > > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
