[time-nuts] The amazing $5 timestamper with 6ns resolution (next, stop: 184ps)

[Jeremy Elson]

Sorry, I forgot that time-nuts just sends text/plain and strips HTML and
attachments -- I've uploaded my sample datasets to here:

https://github.com/jelson/rulos/tree/master/src/app/timestamper/sample-data

Your project sounds interesting and along similar lines to mine. I'm
excited about the STM32 because it has such great hardware support. I
haven't even tried to optimize sampling rate yet, but even the unoptimized
code can easy sample once per microsecond. Honestly the limit at this point
is probably how quickly I can write data out the serial port. In the next
revision I hope to put a native USB interface on the timestamper so it can
send data at full USB rates back to the host.

Best,
-Jeremy


On Tue, Feb 16, 2021 at 9:32 AM Dwayne Esterline <
Dwayne.Esterline at krytronx.com> wrote:

> Jeremy-
>
> Well done! I am certainly interested in learning more about your project.
> Are your charts available online, or would you mind sending me a copy (
> dwayne.esterline at krytronx.com)
>
> I am running an experiment using a 20mhz OCXO driving 32bit binary counter
> IC's (sn74lv8154 @ about $1), and sampling the count via Arduino Nano33IOT
> using an i2C bus, and writing the result to an online mySQL database via
> wifi. This gives 50ns resolution, but a relatively low sample rate due to
> the read time of the i2C bus. I can zero the counters and sample the
> counters very precisely with interrupts, but reading is a multi-byte data
> transfer process (on the order of 10's of milliseconds).
>
> My personal interest is in studying the fine structure of the short term
> variations and random behaviors of time measurement (what normal time-nuts
> call noise :-)
>
> Looking forward to watching your project develop, and have been learning
> much from the veterans of this mailing list- keep it coming.
>
> -Dwayne Esterline
>
>
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