MAX11905 might do the job. 20 bit. but spendy. probably $50 in singles.
QSPI and SPI for interfaces. data rate 1600 ksps. SAR > 16 bit gets
really touchy... CMRR, noise, etc. Good luck.
On 9/18/19 7:01 AM, Curtis Dutton wrote:
Right now my test set up is going to consist of a 6i25, 7i85 and an 8i20. I
wonder if the 7i85 could expose a BSPI interface. Or could I tack a BSPI on
to the 6i25's spare 25 pin connector?
I also am considering just writing a parallel port driver running at some
higher rate than the servo thread that would allow me to communicate with
the spi device.
On Wed, Sep 18, 2019 at 9:36 AM Curtis Dutton <curtd...@gmail.com> wrote:
Chris thanks for the info.
I'm not exactly certain at this point what precision I need. I'll be
determining that experimentally later. I will keep in mind what you have
said, I'll deal with it after I get my hardware running.
On Tue, Sep 17, 2019 at 6:17 PM Chris Albertson <albertson.ch...@gmail.com>
wrote:
If you want better than 16-bits and 1KHz then you also are going to need a
very good quality analog signal conditioning and instrumentation
amplifier.
The analog circuit between the A/D converts and the load cell really
does
matter. You have to reject common-mode or the low bits will just be
filled with 60Hz noise. And you can not simply use a "brick wall" filter
or you will not get the desired bandwidth through. (If you are needing to
sample at 1K then you must care about 500Hz bandwidth.
This matters a LOT more than which A/D chip you use.
22 bits is better than one part per million. Do you really need that? It
will be hard to isolate all of the electrical and mechanical noise
especially
On Tue, Sep 17, 2019 at 2:26 PM Curtis Dutton <curtd...@gmail.com> wrote:
I have a pet project I'm starting that will involve reading a load cell
in
as near as real time as possible and using that input for servo control.
I plan on using mesa hardware to interface to the equipment. Does anyone
know of a nice way to interface hotsmot2 to a load cell?
I would like a fairly high resolution. 16 bit minimum, the higher the
better up to 22 bit I suppose. As well as the ability to sample at the
servo thread rate of 1 Khz.
Thanks,
Curtis
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Chris Albertson
Redondo Beach, California
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