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Right about now you're saying to yourself "these RJ11 jacks are
insanely large!" But it's a daisy-chain bus and your controller PCB
is not likely to have more than one or a very small number of bus
interfaces, so you're probably just dealing with one connector site
(for the RJ11 jack I mentioned you need 16x17mm). Yes, that's maybe
an extra dollar or dollar and a half on a set of three OSH Park
boards vs using a DF13.<br>
<br>
The issue, in my opinion, is getting practical, inexpensive,
*impedance controlled* cable physically attached to the connector.
It seems problematic to adapt CAT3/5/6 to a DF13 so you avoid
work-hardening and breaking wires while getting the thing on and
off, arranging the cable run, etc. The JST PH series of connectors
(the ones you see all the time for lithium battery connections)
might be an alternative (and I have pile of these and a factory tool
to play with if you want to explore that). But in terms of physical
connection the DF13 or JST are going to want some major help because
only two to four wires can attach and these are very wimpy, solid
copper wires. With an RJ11 you at least get six of (typically) eight
connected. Unfortunately an experiment with heat shrink just now
makes it clear there is no way to use this to physically secure the
UTP to the end of the RJ11 plug: the entire plug goes into the jack
with nothing left for an overlap of heat shrink.<br>
-Pete <br>
<br>
<div class="moz-cite-prefix">On 09/25/2015 10:18 AM, Charles West
via TriEmbed wrote:<br>
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<div>Hello,<br>
<br>
</div>
I'm working on a board for the CanInstall autoregistration
project and I'm not really sure what connectors to use for
it. I'm currently leaning toward either DF13-4 connectors
or simple 4 pin headers. If I may ask, are there any
other connectors that you would recommend or have used in
your projects?<br>
<br>
</div>
Pros/cons:<br>
DF13:<br>
The upside is that they are very small, connect very
securely and SMD female connectors are $.41 per. The
downside is that they are extremely hard to get out (don't
pull on cable, very gently pry with finger nail on one side,
then the other) and cables for them are extremely hard to
find/expensive ($1.5 per in lots of 20 is the cheapest I've
found).<br>
<br>
Vertical Headers:<br>
The plus is I can get break apart SMD headers at roughly
$.05 each including shipping at lots of $5 (<a
moz-do-not-send="true"
href="http://www.ebay.com/itm/10pcs-2-54MM-1-40Pin-SMD-SMT-1-40Pin-Male-Single-Row-Pin-Header-/261879748701?hash=item3cf93fd85d"
target="_blank"><a class="moz-txt-link-freetext" href="http://www.ebay.com/itm/10pcs-2-54MM-1-40Pin-SMD-SMT-1-40Pin-Male-Single-Row-Pin-Header-/261879748701?hash=item3cf93fd85d">http://www.ebay.com/itm/10pcs-2-54MM-1-40Pin-SMD-SMT-1-40Pin-Male-Single-Row-Pin-Header-/261879748701?hash=item3cf93fd85d</a></a>),
cables at $.22 per in lots of $5 (<a moz-do-not-send="true"
href="http://www.ebay.com/itm/20pcs-2-54mm-to-2-54mm-Dupont-Wire-Cable-Connectors-4P-to-4P-Pin-Header-20cm-YG-/111487505711?hash=item19f52c552f"
target="_blank">http://www.ebay.com/itm/20pcs-2-54mm-to-2-54mm-Dupont-Wire-Cable-Connectors-4P-to-4P-Pin-Header-20cm-YG-/111487505711?hash=item19f52c552f</a>)
and they are pretty standard for hobbyist projects (and
extremely similar to servo connections). The downsides are
that they have no polarity control, are much more likely to
slide out and take up a lot more board real estate
(translating to either bigger boards or less connectors).<br>
<br>
</div>
Thanks,<br>
</div>
Charlie<br>
</div>
<br>
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