[clue] [tech] Linux-supported Data Acquisition OEM module with USB interface?
Jim Ockers
ockers at ockers.net
Wed Oct 12 16:40:23 MDT 2011
Hi Nick,
Thanks for the tip. Yes that is along the lines of what I was looking
for. The Phidget have only 10-bit ADC. "The RawSensorValue property
brings out a 12-bit value (0-4095) for users who require maximum
accuracy. Please note that the sampling is actually done with an
oversampled 10-bit ADC, but reported as a 12-bit value to allow future
expansion."
I really do need the 16-bit ADC minimum resolution, 24-bit is better...
I guess we could rearrange the electrons from our sensor such that we
connect the inputs back-to-back and get 20-bit resolution. I will think
about it and see if this is possible.
Any other suggestions from the group?
Thanks,
Jim
Nick Pascucci wrote:
> Jim,
>
> You might try looking into Phidgets boards. I'm not sure if they'll
> have enough accuracy for you, but it's worth a look.
>
> Regards,
> Nick Pascucci
>
>
>
> On Wed, Oct 12, 2011 at 4:22 PM, Jim Ockers <ockers at ockers.net
> <mailto:ockers at ockers.net>> wrote:
>
> Hi CLUEbies,
>
> I'm doing a bit of research and I need to find an OEM data
> acquisition module which I can use from a Linux program. That is,
> it has to have Linux libraries. Most of what I find on the 'net
> is for Windows and they have Labview libraries with only Microsoft
> Windows support. I found one company mccdaq.com
> <http://mccdaq.com> which has a USB OEM module (the USB-7000
> series supports Linux) but those have not enough digital I/Os or
> else low resolution (12-bit) analog input. Their more powerful
> boards are Windows only.
>
> Any ideas from the CLUE audience about where to look? This is for
> an embedded industrial control type application that also requires
> high resolution (very high accuracy & precision) sampling of some
> analog inputs. We need 16-bit resolution at least. It doesn't
> have to be fast, 4Hz is what we have now. We need at least 16
> digital I/O and 8 16-bit analog input. Isolation is good too.
>
> It'd be nice to get a prepackaged board with software but I've
> thought about trying to roll my own with Arduino. The only A/D
> example I see for the Arduino is 12-bit resolution. I guess I
> could put them back to back as differential inputs and get 24-bit
> resolution, but either way that is a fair bit of hardware
> complexity and time/effort that I'd rather just buy.
>
> Thanks,
> Jim
>
> --
> Jim Ockers, P.Eng. (ockers at ockers.net <mailto:ockers at ockers.net>)
> Contact info: http://www.ockers.net/msi.html
>
>
>
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