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<font face="Arial">As I noted yesterday, operation of the rm3100 and
temperature sensor using 400 feet of Cat5shielded outdoor/direct
burial cable using differential i2c signalling as designed by
Scott, Dave, et al, is producing the same results as the
successful test on 120 feet of the same cable a couple of weeks
ago.<br>
Differential waveforms are consistent with driving a matched
terminated transmission line. <br>
For curiosity's sake, the voltage supply for the remote end was
maintained at the 3.3 volts available on the Raspberry Pi. As
expected, for the cable conductor resistance and current drain of
the remote (including the transient drain of the differential
driver at the remote end during data transfer) voltage at the
remote end was slightly under 3 volts at max current drain with a
peak to peak variation that exceeded the 'ripple' rating of the
RM3100 supply voltage which is probably affecting the accuracy of
the RM3100.<br>
<br>
Next step is the addition of a 3.3 Volt LDO regulator at the
remote end with 5 volts supplied over the cable. <br>
Jules - K2KGJ<br>
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<div class="moz-cite-prefix">On 5/20/2020 12:53 PM, David Witten
wrote:<br>
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cite="mid:CABJ3BVOwyWxDTrkdGZCrXfVhEXZyPxksqrFQ4uk7n=YJomDmsw@mail.gmail.com">
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<div dir="ltr">All 'magnetometerists':
<div><br>
</div>
<div>I am actively updating the software on Github ( <a
href="https://github.com/wittend/rm3100-runMag"
moz-do-not-send="true">https://github.com/wittend/rm3100-runMag</a> ).
I appreciate all of the input I am getting. Both Julius Madey
and Dave Larsen have been especially helpful. Check for
updates often (if you have cloned the repository, just use git
pull from your projects base folder).</div>
<div><br>
</div>
<div>The time is coming where I am going to have to ask folks to
submit bug fix / feature requests using the 'Issues Tracking'
feature on the repository ( <a
href="https://github.com/wittend/rm3100-runMag/issues"
moz-do-not-send="true">https://github.com/wittend/rm3100-runMag/issues</a> )
so that I can avoid losing them in my email and prioritise
them rationally.</div>
<div><br>
</div>
<div>My latest commit updates the presentation of the output
somewhat. Important changes include more understandable
messages regarding missing sensors, presenting some of the
values with more decimal places, and more useful presentation
of values entered on the command line using the -P option. </div>
<div><br>
</div>
<div>Other work continues on several fronts. Most important (to
me) at the moment is synchronizing the Cycle Count (CC) values
with the Gain used for computing output. Also important is
constraining the CC input to values that the sensor will
accept. Some other value inputs need to be sanity checked.</div>
<div><br>
</div>
<div>Please test this and give me your input and frustrations.
Now is a good time for me to work on this.</div>
<div><br>
</div>
<div>Dave Witten, KD0EAG</div>
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