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hmascience - 2008-09-01 9:59 AM
Are you still trying to suck in and manipulate racecar data?
How big are these files?
Over the coffee room table, I've shot the breeze with some grad students that were doing the same thing (well, kinda sorta... they were taking some serious hits because of the data density, but from their POV they were doing "something new" ... beats me if it really was) and I was curious about your application.
hmascience no for this Application I'm working on an electric motor assisted bicycle for my own Commuter use. I'm real interested in monitoring several Variables like Monitoring like Voltage and Current Draw, Battery Drain, and using hall effect Sensors to monitor Wheel, and motor RPM that will also Give me MPH data, so I can work to optimize the Mechanics, and the Allen Braidey Programmable speed Controller , I was able to Salvage. now when I mentioned the Race Pac Stuff, what you have to remember is the Race Pac it's self is a Realtime Data Logger, and all Data is pulled from it in Batch dump. Now I suspect that the "data density" problem your friends are refureing to is one of 2 things Either they are trying too hard to monitor things that realy don't matter, like the F1, and sporty car guys do. I'll give you an example, We had a friend that was an engineer for elf, and he was working on some new Chamber and Port modifications for the Cosworth Indy car engine, and they were using a Desktop Cray YMP to do the Data Acquisition on these Lead Crystal Quartz Heads where they were collecting something like 2048 Channels of Data at something Overly Crazy like 12 KHZ Sample Rate!
The other possible "data density" problem your friends are refuring to is they are trying to collect too many channels at to high a Frequency using a Consumer Windows OS though a slow USB Bus. Years ago Att- Bell Labs developed a Real time Unix OS called Plan9 that even today with such a small limited user base is still an excellent DAQ OS
but for my little Project I'm only using a
$25 4 CHANNEL DAQ , working @ maybe 24-48 Hz sample Rate. I'm thinking I'll need 2 720's to get 8 channels of Data logged.
If you are interested in working on aor talking about Realtime Projects on the hand helds Please PM me I'm always up to chat about Real time stuff !