Data Logging
Data Logging
(OP)
I have to log pH and ORP stuff on a continual basis.
What are we using for data collection these days?
I think this is going to be 4-20mA or 0-5V. I can see that this will probably grow to more than two data stream too.
Eventually I'd also like to retrieve it wirelessly if possible so while the logger is logging I need to also be able to read it out.
A PLC Modbus crazy PLC will likely be involved too if that can be useful.
What are we using for data collection these days?
I think this is going to be 4-20mA or 0-5V. I can see that this will probably grow to more than two data stream too.
Eventually I'd also like to retrieve it wirelessly if possible so while the logger is logging I need to also be able to read it out.
A PLC Modbus crazy PLC will likely be involved too if that can be useful.
Keith Cress
kcress - http://www.flaminsystems.com





RE: Data Logging
Mike Halloran
Pembroke Pines, FL, USA
RE: Data Logging
24Hrs x 60Minutes x 8ch
Likely 12bit data i.e. 2 bytes.
24x60x2 = 2880 bytes per day.
Preferably holding a month's data
2880 x 30 days = 100k of storage.
Keith Cress
kcress - http://www.flaminsystems.com
RE: Data Logging
battery powered loggers - http://www.mccdaq.com/solutions/Logger-Solutions.a...
bluetooth wireless - http://www.mccdaq.com/solutions/Wireless-Solutions...
RE: Data Logging
Keith Cress
kcress - http://www.flaminsystems.com
RE: Data Logging
TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers
RE: Data Logging
No not specifically OTS but that would probably be my first choice. There are other things going on that might make Arduinos/Raspberrys useful in these applications too so I'm certainly willing to entertain them.
Have you used either of them for data logging or even just analog inputs of any type with them?
Keith Cress
kcress - http://www.flaminsystems.com
RE: Data Logging
If the basic Arduino Uno doesn't have enough channels for your needs, there are larger models for only slightly less cheapness.
The Pi has no onboard A to D, so you'll need a shield to do that (and things like the Gertboard only have two A to D channels) - as well as scaling and buffering. I could only ever see me using it for data logging in conjunction with an OTS USB DAQ pod.
A.
RE: Data Logging
Go old school:
Sutron 8210
I'm using one for basically the same purpose, myself, and I have a few spares. Free if you pay shipping (North America)
I read all of your requirements above. It does everything you want (you aren't asking for much!)
STF
RE: Data Logging
Spar; Those Sutrons look really well thought out and supported. You sure don't see manuals like that these days!
I'm intrigued. That might actually work. I appreciate the offer! What do you think postage would be to... say, San Fransisco?
Keith Cress
kcress - http://www.flaminsystems.com
RE: Data Logging
RE: Data Logging
RE: Data Logging
If you are seriously interested, please read:
http://www.fieldlines.com/index.php/topic,148892.m...
You can contact me through that website, or through means available with Eng-Tips, or at the "obvious" URL. Make sure to append .ca not .com.
STF
RE: Data Logging
Huh,I didn't see any that looked too similar I need to look again.
SparWeb; Thanks for the FLs link. I'll contact you.
Keith Cress
kcress - http://www.flaminsystems.com
RE: Data Logging
RE: Data Logging
Keith Cress
kcress - http://www.flaminsystems.com
RE: Data Logging
Lionel and BTrueblood are right - although I know there's another American firm that claims that the Minilab 1008 is in turn a copy of one of its own products.
A.