[TriEmbed] Favourite electrical connectors?

Fri Sep 25 14:22:28 CDT 2015

My favorite is Eurostyle connector from Molex, 39501 and 39502 series.

http://www.ebay.com/sch/i.html?_odkw=3.5mm+connector+terminal+green&_osacat=0&_from=R40&_trksid=p2045573.m570.l1313.TR0.TRC0.H0.X3.5mm+connector+pluggable+green.TRS0&_nkw=3.5mm+connector+pluggable+green&_sacat=0

On Fri, Sep 25, 2015 at 1:17 PM, Pete Soper via TriEmbed <
triembed at triembed.org> wrote:

>
>
> On 09/25/2015 01:06 PM, Carl Nobile wrote:
>
> Pete,
>
> What Charlie is trying to do is create a board that the people working on
> the CANInstall spec can use as a base line tool. We won't be using long
> cables for this initial work.
>
> I like the RJ11 for some things, but it needs to mate with a flat cable
> which by its nature can't be twisted, CAT cables won't mate to it without a
> lot of extra work. We need, as Charlie just told me,
>
> Tell this to the fractional billions of people using RJ45 connectors.
> They're identical to RJ11 but eight vs six connections. I agree 200% that
> inserting and crimping UTP into an RJ45 or RJ11 is a certified, genuine
> pain in the you know what, but figured labor costs in this case are
> considered zero. :-)
>
> -Pete
>
>
> four wires, two for the CAN protocol and two for power. Each one will go
> to some sort of sensor.
>
> ~Carl
>
>
> On Fri, Sep 25, 2015 at 12:46 PM, Pete Soper via TriEmbed <
> <triembed at triembed.org>triembed at triembed.org> wrote:
>
>> The cable requirement for CANBUS is explicitly dictated by the bus
>> standard (covered in this TI blurb
>> <http://www.ti.com/lit/an/slla270/slla270.pdf>): you'll be using 120 ohm
>> twisted pair. Accommodating the 120 ohm termination resistors needed at the
>> two ends of the bus is a side issue that might interact with connector
>> choice. The easy choice for cable is UTP (aka CAT3/5/6) with as few twisted
>> pairs as you can get by with (since canbus only uses one pair). Somebody
>> recently gave away hundreds of feet of this stuff at a TriEmbed meeting, so
>> I think this is a good choice.
>>
>> The bus is only two wires, plus one more for an optional shield. So a
>> very simple connector will do it. IMO the lowly RJ11 will get the job done.
>> I have three crimping tools you can borrow. :-) The male connectors are
>> cheap as dirt. Here's a Digikey jack
>> <http://www.digikey.com/product-detail/en/A-2014-0-4-R/AE10390-ND/2183641>
>> (35 cents at Q50). Some of the "big boys" use RJ45, but I can't see the
>> need for that and it's just extra cost wrt PCB area.
>>
>> The lowly RJ11 combined with UTP cable might be a practical solution. The
>> connector is "keyed", trivial to get in and out, but stays in place. You
>> could also arrange a convention where a termination resistor could either
>> be crimped into two additional connector sites (so the termination is part
>> of the cable) or handled on the PCB. A weather boot would be used for cases
>> where crud might get inside the connector, as it is highly exposed. Using
>> dielectric grease to exclude oxygen would be a good idea too for cases
>> where the connection is going to be exposed.
>>
>> -Pete
>>
>>
>> On 09/25/2015 10:18 AM, Charles West via TriEmbed wrote:
>>
>> Hello,
>>
>> 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?
>>
>> Pros/cons:
>> DF13:
>> 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).
>>
>> Vertical Headers:
>> The plus is I can get break apart SMD headers at roughly $.05 each
>> including shipping at lots of $5 (
>> http://www.ebay.com/itm/10pcs-2-54MM-1-40Pin-SMD-SMT-1-40Pin-Male-Single-Row-Pin-Header-/261879748701?hash=item3cf93fd85d),
>> cables at $.22 per in lots of $5 (
>> <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>
>> 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)
>> 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).
>>
>> Thanks,
>> Charlie
>>
>>
>> _______________________________________________
>> Triangle, NC Embedded Computing mailing listTriEmbed at triembed.orghttp://mail.triembed.org/mailman/listinfo/triembed_triembed.org
>> TriEmbed web site: http://TriEmbed.org
>>
>>
>>
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>>
>
>
> --
>
> -------------------------------------------------------------------------------
> Carl J. Nobile (Software Engineer)
> carl.nobile at gmail.com
>
> -------------------------------------------------------------------------------
>
>
>
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