[Dprglist] Fwd: Need suggestion for expansion boards for STM32 to build a robot

Doug Paradis paradug at gmail.com
Thu Oct 21 10:08:42 PDT 2021 

Kumar,
       The  NUCLEO STM32L476RG looks like a very nice board (M4-cortex, 1M
Flash, 80 MHz clock, 16 timers, 5 UARTS, CAN, multiple I2C and SPI, Single
Wire, etc...). As Chris said, with motor drivers and sensors you should be
able to build a powerful robot. The problem I always have is breaking the
pins out with enough power and ground pins for all the non-NUCLEO stuff. It
helps that the Nucleo form factor includes an Arduino UNO pin footprint.
This allows the use of an Arduino UNO sensor shield, like this
https://smile.amazon.com/dp/B01MXRXCAW?psc=1&ref=ppx_yo2_dt_b_product_details
. This shield doesn't break out all the pins, but does provide plenty of
power and ground pins that can be used with the ones it breaks out, with
some for the pins that are not broken out. It is also very cheap.
An alternative is a board laid out by club member Ron Grant. Ron's board
requires some more work on your part, but breaks out all the pins. It is
much larger than the UNO sensor shield, but has some nice features. It may
require having it built at a PCB company.

      I recommend using the Arduino UNO sensor board to start out. It is
cheap and can be obtained quickly.

Regards,
Doug P.

On Wed, Oct 20, 2021 at 11:05 PM Thalanayar Muthukumar via DPRGlist <
dprglist at lists.dprg.org> wrote:

> So far, in the past few months, I have been building Arduino or RPi based
> robots.
> I decided next, to use the STM32 and ordered a NUCLEO STM32L476RG Kit.
>
> Need suggestions for expansion boards that can help me build a robot.
> I see many Arduino shields and Pi Hats, but could not locate the right
> expansion board.
>
> Or instead of the NUCLEO kit, should I be looking at other STM32 boards?
> I do not want to build a custom board.
>
> Regards.
> - Kumar
>
> On Wed, Oct 20, 2021 at 3:51 PM <dprglist-request at lists.dprg.org> wrote:
>
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>> Today's Topics:
>>
>>    1. Re: rtk2go (Karim Virani)
>>    2. Thought this was a cool idea.... (pulcher at killercomputing.com)
>>
>>
>> ----------------------------------------------------------------------
>>
>> Message: 1
>> Date: Tue, 19 Oct 2021 19:13:35 -0500
>> From: Karim Virani <pondersome64 at gmail.com>
>> To: Thalanayar Muthukumar <tnkumar at gmail.com>
>> Cc: Iron Reign <ironreignrobotics at gmail.com>, DPRG
>>         <dprglist at lists.dprg.org>
>> Subject: Re: [Dprglist] rtk2go
>> Message-ID:
>>         <
>> CAKtnkiz_dD81o3A9L88q2EwV7xzUbVoD2FaSLGuCa4HKhhAFjQ at mail.gmail.com>
>> Content-Type: text/plain; charset="utf-8"
>>
>> Yup. It's not a light decision to go down the road to high precision GPS.
>> The required commitment in time is even more than the 10X dollar cost.
>> Gotta have a compelling requirement.
>>
>> On Mon, Oct 18, 2021 at 6:06 PM Thalanayar Muthukumar <tnkumar at gmail.com>
>> wrote:
>>
>> > uBlox F9P is ~275$. I cannot afford it at this point of time.
>> >
>> > Regards.
>> > - Kumar
>> >
>> > On Mon, Oct 18, 2021 at 6:05 PM Thalanayar Muthukumar <
>> tnkumar at gmail.com>
>> > wrote:
>> >
>> >> Thanks @IronReign ... I will check out ublox F9P.
>> >>
>> >> Regards.
>> >> - Kumar
>> >>
>> >> On Mon, Oct 18, 2021 at 4:00 PM Iron Reign <
>> ironreignrobotics at gmail.com>
>> >> wrote:
>> >>
>> >>> Kumar,
>> >>>
>> >>> Looks like that receiver supports multiple constellations, which is
>> >>> nice, but I'm pretty sure it won't have any RTK features, so you're
>> looking
>> >>> at your normal 2-3 meter accuracy range. RTK receivers are
>> significantly
>> >>> more expensive and you'll also need to invest in a matching antenna.
>> >>> There's a section of my notes the ublox F9P which is the module I'm
>> using.
>> >>>
>> >>> On Mon, Oct 18, 2021 at 3:19 PM Thalanayar Muthukumar via DPRGlist <
>> >>> dprglist at lists.dprg.org> wrote:
>> >>>
>> >>>> I am considering adding (https://www.adafruit.com/product/4415) to
>> my
>> >>>> rover.
>> >>>>
>> >>>> Regards.
>> >>>> - Kumar
>> >>>>
>> >>>> On Mon, Oct 18, 2021 at 1:57 PM Thalanayar Muthukumar <
>> >>>> tnkumar at gmail.com> wrote:
>> >>>>
>> >>>>> Thanks Karim for the fairly detailed succinct :-) answer. Really
>> >>>>> appreciate it.
>> >>>>> I have downloaded your notes, but have yet to read it.
>> >>>>>
>> >>>>> As a person who plans to take my rover outdoors,and I plan to have
>> >>>>> internet access on my rover, it seems I should
>> >>>>> connect to a NTRIP server at rtk2go.com (I live in Allen, TX) and
>> by
>> >>>>> doing so, I can get higher accuracy.
>> >>>>>
>> >>>>> Your email was very helpful, Karim. Thanks.
>> >>>>>
>> >>>>> Regards.
>> >>>>> - Kumar
>> >>>>>
>> >>>>> On Mon, Oct 18, 2021 at 12:04 PM Karim Virani <
>> pondersome64 at gmail.com>
>> >>>>> wrote:
>> >>>>>
>> >>>>>> That's a big topic and it bleeds into everything RTK very quickly.
>> So
>> >>>>>> I'll try for an almost succinct answer that should provide search
>> terms for
>> >>>>>> learning more:
>> >>>>>>
>> >>>>>> RTK gps rovers require a live timing reference from another
>> specialty
>> >>>>>> GPS receiver with a well-known location known as a base station or
>> mount
>> >>>>>> point. The base station needs to be somewhat close to the rover's
>> location
>> >>>>>> - ideally within 10km, but "long baseline" trials indicate you can
>> get good
>> >>>>>> solutions out to and beyond 50km depending on geography. The data
>> coming
>> >>>>>> from the base station is usually formatted as RTCM messages but
>> can be
>> >>>>>> transferred over any link. Often in very remote locations you have
>> to set
>> >>>>>> up your own base station and you might use a point-to-point radio
>> link to
>> >>>>>> communicate between rover and base station.
>> >>>>>>
>> >>>>>> There are also private, commercial and governmental networks of
>> these
>> >>>>>> correcting base stations. The private ones are usually monetizing
>> their own
>> >>>>>> and governmental base stations. These tend to be pricey services
>> from the
>> >>>>>> traditional hobby robotics viewpoint - they are focused on the
>> survey and
>> >>>>>> agricultural markets. There is a very large free governmental
>> network (
>> >>>>>> unavco.org) that serves active fault and mountain areas but that's
>> >>>>>> mostly on the west coast and the rockies. Texas has a free
>> non-real time
>> >>>>>> network which can help with post-processing to get a good
>> base-station
>> >>>>>> fix, but doesn't help with RTK.  NASA operates another fairly open
>> network,
>> >>>>>> but it requires getting an account and authorizing - and I didn't
>> want to
>> >>>>>> write the authentication code for my robot.
>> >>>>>>
>> >>>>>> If you have internet access on your rover, one of the ways to get
>> >>>>>> RTCM messages is from an NTRIP server. So many of those commercial
>> and
>> >>>>>> government networks operate NTRIP servers. The leading
>> implementation of
>> >>>>>> NTRIP is called SNIP and the company that makes SNIP also supports
>> a
>> >>>>>> voluntary NTRIP server for people who want to publish their base
>> stations -
>> >>>>>> known as "mount points" in NTRIP/SNIP land. That network is
>> available at
>> >>>>>> rtk2go.com It's completely free and requires no authentication to
>> >>>>>> use as a client.
>> >>>>>>
>> >>>>>> Anyhow, if you are still reading and still want to learn more, you
>> >>>>>> can also access my project notes
>> >>>>>> <
>> https://docs.google.com/document/d/1S-OwHQL25ngPYy-97KP6jZPA6bVr2L2PiUL6ix_6Dts/edit?usp=sharing
>> >.
>> >>>>>> These notes are for my outdoor rovers and as source material for
>> videos,
>> >>>>>> blog articles and presentations I might want to do, so they are a
>> bit
>> >>>>>> jumbled up. There is a GPS RTK primer that starts on page 16.
>> >>>>>>
>> >>>>>> -Karim
>> >>>>>>
>> >>>>>> On Sun, Oct 17, 2021 at 6:44 PM Thalanayar Muthukumar via DPRGlist
>> <
>> >>>>>> dprglist at lists.dprg.org> wrote:
>> >>>>>>
>> >>>>>>> Hi Karim,
>> >>>>>>>
>> >>>>>>> What is a rtk2go network and how does one use it?
>> >>>>>>>
>> >>>>>>> Regards.
>> >>>>>>> - Kumar
>> >>>>>>>
>> >>>>>>> On Sun, Oct 17, 2021 at 4:09 PM <dprglist-request at lists.dprg.org>
>> >>>>>>> wrote:
>> >>>>>>>
>> >>>>>>>> Send DPRGlist mailing list submissions to
>> >>>>>>>>         dprglist at lists.dprg.org
>> >>>>>>>>
>> >>>>>>>> To subscribe or unsubscribe via the World Wide Web, visit
>> >>>>>>>>         http://lists.dprg.org/listinfo.cgi/dprglist-dprg.org
>> >>>>>>>> or, via email, send a message with subject or body 'help' to
>> >>>>>>>>         dprglist-request at lists.dprg.org
>> >>>>>>>>
>> >>>>>>>> You can reach the person managing the list at
>> >>>>>>>>         dprglist-owner at lists.dprg.org
>> >>>>>>>>
>> >>>>>>>> When replying, please edit your Subject line so it is more
>> specific
>> >>>>>>>> than "Re: Contents of DPRGlist digest..."
>> >>>>>>>>
>> >>>>>>>>
>> >>>>>>>> Today's Topics:
>> >>>>>>>>
>> >>>>>>>>    1. Re: DPRGlist Digest, Vol 61, Issue 15 (Thalanayar
>> Muthukumar)
>> >>>>>>>>    2. Re: DPRGlist Digest, Vol 61, Issue 15 (pulcher)
>> >>>>>>>>    3. Free SSD drive at Micro Center Dallas (Thalanayar
>> Muthukumar)
>> >>>>>>>>    4. Interesting techniques for 'making & decorating'
>> mechetronics
>> >>>>>>>>       (Carl Ott)
>> >>>>>>>>    5. Re: RTK corrections source in DFW area? (Karim Virani)
>> >>>>>>>>
>> >>>>>>>>
>> >>>>>>>>
>> >>>>>>>>
>> ----------------------------------------------------------------------
>> >>>>>>>>
>> >>>>>>>> Message: 1
>> >>>>>>>> Date: Sat, 16 Oct 2021 16:45:47 -0500
>> >>>>>>>> From: Thalanayar Muthukumar <tnkumar at gmail.com>
>> >>>>>>>> To: dprglist-request at lists.dprg.org
>> >>>>>>>> Cc: dprglist at lists.dprg.org
>> >>>>>>>> Subject: Re: [Dprglist] DPRGlist Digest, Vol 61, Issue 15
>> >>>>>>>> Message-ID: <C6BFCA25-36F9-4F55-8CE3-22C187F8F347 at gmail.com>
>> >>>>>>>> Content-Type: text/plain; charset=us-ascii
>> >>>>>>>>
>> >>>>>>>> Micro center Dallas say they are currently sold out
>> >>>>>>>>
>> >>>>>>>> Sent from my iPhone
>> >>>>>>>>
>> >>>>>>>> > On Oct 16, 2021, at 4:04 PM, dprglist-request at lists.dprg.org
>> >>>>>>>> wrote:
>> >>>>>>>> >
>> >>>>>>>>
>> >>>>>>>>
>> >>>>>>>> ------------------------------
>> >>>>>>>>
>> >>>>>>>> Message: 2
>> >>>>>>>> Date: Sat, 16 Oct 2021 17:24:35 -0500
>> >>>>>>>> From: pulcher <pulcher at killercomputing.com>
>> >>>>>>>> To: Thalanayar Muthukumar <tnkumar at gmail.com>,
>> >>>>>>>>         dprglist-request at lists.dprg.org
>> >>>>>>>> Cc: dprglist at lists.dprg.org
>> >>>>>>>> Subject: Re: [Dprglist] DPRGlist Digest, Vol 61, Issue 15
>> >>>>>>>> Message-ID:
>> >>>>>>>>         <
>> mailman.2.1634503868.1684.dprglist-dprg.org at lists.dprg.org
>> >>>>>>>> >
>> >>>>>>>> Content-Type: text/plain; charset="utf-8"
>> >>>>>>>>
>> >>>>>>>> Wife just picked one up.? 2 minutes ago.HaroldSent from my
>> T-Mobile
>> >>>>>>>> 4G LTE Device
>> >>>>>>>> -------- Original message --------From: Thalanayar Muthukumar via
>> >>>>>>>> DPRGlist <dprglist at lists.dprg.org> Date: 10/16/21  4:45 PM
>> >>>>>>>> (GMT-06:00) To: dprglist-request at lists.dprg.org Cc:
>> >>>>>>>> dprglist at lists.dprg.org Subject: Re: [Dprglist] DPRGlist Digest,
>> >>>>>>>> Vol 61, Issue 15 Micro center Dallas say they are currently sold
>> outSent
>> >>>>>>>> from my iPhone> On Oct 16, 2021, at 4:04 PM,
>> >>>>>>>> dprglist-request at lists.dprg.org wrote:>
>> >>>>>>>> _______________________________________________DPRGlist mailing
>> >>>>>>>> listDPRGlist at lists.dprg.orghttp://
>> >>>>>>>> lists.dprg.org/listinfo.cgi/dprglist-dprg.org
>> >>>>>>>> -------------- next part --------------
>> >>>>>>>> An HTML attachment was scrubbed...
>> >>>>>>>> URL: <
>> >>>>>>>>
>> http://lists.dprg.org/pipermail/dprglist-dprg.org/attachments/20211016/a33a2617/attachment.html
>> >>>>>>>> >
>> >>>>>>>>
>> >>>>>>>> ------------------------------
>> >>>>>>>>
>> >>>>>>>> Message: 3
>> >>>>>>>> Date: Sat, 16 Oct 2021 19:13:12 -0500
>> >>>>>>>> From: Thalanayar Muthukumar <tnkumar at gmail.com>
>> >>>>>>>> To: pulcher <pulcher at killercomputing.com>
>> >>>>>>>> Cc: dprglist-request at lists.dprg.org, dprglist at lists.dprg.org
>> >>>>>>>> Subject: [Dprglist] Free SSD drive at Micro Center Dallas
>> >>>>>>>> Message-ID: <205ADA38-0DFD-4C11-8C29-1DE15791571A at gmail.com>
>> >>>>>>>> Content-Type: text/plain; charset="utf-8"
>> >>>>>>>>
>> >>>>>>>> I went to the store just now and picked one up as well. Thanks
>> >>>>>>>> Harold.
>> >>>>>>>>
>> >>>>>>>> Regards.
>> >>>>>>>> - Kumar
>> >>>>>>>>
>> >>>>>>>> Sent from my iPhone
>> >>>>>>>>
>> >>>>>>>> > On Oct 16, 2021, at 5:24 PM, pulcher <
>> pulcher at killercomputing.com>
>> >>>>>>>> wrote:
>> >>>>>>>> >
>> >>>>>>>> > ?
>> >>>>>>>> > Wife just picked one up.  2 minutes ago.
>> >>>>>>>> >
>> >>>>>>>> > Harold
>> >>>>>>>> >
>> >>>>>>>> >
>> >>>>>>>> >
>> >>>>>>>> > Sent from my T-Mobile 4G LTE Device
>> >>>>>>>> >
>> >>>>>>>> >
>> >>>>>>>> > -------- Original message --------
>> >>>>>>>> > From: Thalanayar Muthukumar via DPRGlist <
>> dprglist at lists.dprg.org
>> >>>>>>>> >
>> >>>>>>>> > Date: 10/16/21 4:45 PM (GMT-06:00)
>> >>>>>>>> > To: dprglist-request at lists.dprg.org
>> >>>>>>>> > Cc: dprglist at lists.dprg.org
>> >>>>>>>> > Subject: Re: [Dprglist] DPRGlist Digest, Vol 61, Issue 15
>> >>>>>>>> >
>> >>>>>>>> > Micro center Dallas say they are currently sold out
>> >>>>>>>> >
>> >>>>>>>> > Sent from my iPhone
>> >>>>>>>> >
>> >>>>>>>> > > On Oct 16, 2021, at 4:04 PM, dprglist-request at lists.dprg.org
>> >>>>>>>> wrote:
>> >>>>>>>> > >
>> >>>>>>>> > _______________________________________________
>> >>>>>>>> > DPRGlist mailing list
>> >>>>>>>> > DPRGlist at lists.dprg.org
>> >>>>>>>> > http://lists.dprg.org/listinfo.cgi/dprglist-dprg.org
>> >>>>>>>> -------------- next part --------------
>> >>>>>>>> An HTML attachment was scrubbed...
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>> >>>>>>>>
>> http://lists.dprg.org/pipermail/dprglist-dprg.org/attachments/20211016/a98cdba3/attachment-0001.html
>> >>>>>>>> >
>> >>>>>>>>
>> >>>>>>>> ------------------------------
>> >>>>>>>>
>> >>>>>>>> Message: 4
>> >>>>>>>> Date: Sun, 17 Oct 2021 09:48:21 -0500
>> >>>>>>>> From: Carl Ott <carl.ott.jr at gmail.com>
>> >>>>>>>> To: DPRG D-List <dprglist at dprg.org>
>> >>>>>>>> Subject: [Dprglist] Interesting techniques for 'making &
>> decorating'
>> >>>>>>>>         mechetronics
>> >>>>>>>> Message-ID:
>> >>>>>>>>         <
>> >>>>>>>>
>> CA+XqQZTVWYVt6B8078wRecqy0JyuD7vEQi2xE9XkQfLd5t5rZQ at mail.gmail.com>
>> >>>>>>>> Content-Type: text/plain; charset="utf-8"
>> >>>>>>>>
>> >>>>>>>> video starts with the final product
>> >>>>>>>>
>> >>>>>>>> Techniques are pretty interesting.
>> >>>>>>>> Build time-lapse starts circa 2:20...
>> >>>>>>>> https://youtu.be/rSh0x0GagcQ
>> >>>>>>>> -------------- next part --------------
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>> >>>>>>>> >
>> >>>>>>>>
>> >>>>>>>> ------------------------------
>> >>>>>>>>
>> >>>>>>>> Message: 5
>> >>>>>>>> Date: Sun, 17 Oct 2021 15:03:01 -0500
>> >>>>>>>> From: Karim Virani <pondersome64 at gmail.com>
>> >>>>>>>> To: Doug Paradis <paradug at gmail.com>, DPRG <
>> dprglist at lists.dprg.org
>> >>>>>>>> >
>> >>>>>>>> Cc: Paul Bouchier <paul.bouchier at gmail.com>
>> >>>>>>>> Subject: Re: [Dprglist] RTK corrections source in DFW area?
>> >>>>>>>> Message-ID:
>> >>>>>>>>         <CAKtnkiwq82PVV4riXMP=
>> >>>>>>>> 5H9zaTnec3-YE5KJz3pH9TDyPZeNtg at mail.gmail.com>
>> >>>>>>>> Content-Type: text/plain; charset="utf-8"
>> >>>>>>>>
>> >>>>>>>> Hey Paul,
>> >>>>>>>>
>> >>>>>>>> I've been using the rtk2go network. It's just a voluntary
>> network,
>> >>>>>>>> so
>> >>>>>>>> there's no guarantee that the base stations are correct to a
>> known
>> >>>>>>>> precision, nor is there an uptime guarantee. It's also very
>> sparsely
>> >>>>>>>> populated in north Texas:
>> >>>>>>>>
>> >>>>>>>> [image: image.png]
>> >>>>>>>>
>> >>>>>>>>
>> >>>>>>>> But I've found the VN1 mount point in Richardson to be very
>> stable
>> >>>>>>>> and
>> >>>>>>>> accurate for the last year - though it has had some outages.I've
>> >>>>>>>> been able
>> >>>>>>>> to use it up to 35km away and still get an error bar that I can't
>> >>>>>>>> reliably
>> >>>>>>>> measure.
>> >>>>>>>>
>> >>>>>>>> The Arlington mount point also seems stable - it's been there for
>> >>>>>>>> at least
>> >>>>>>>> 6 months - but I haven't used it. Others pop up from time to time
>> >>>>>>>> but
>> >>>>>>>> haven't lasted long. I've published a base station on rtk2go for
>> >>>>>>>> short test
>> >>>>>>>> runs, but have yet to mount my antenna on my roof for a stable
>> >>>>>>>> offering.
>> >>>>>>>>
>> >>>>>>>> Best,
>> >>>>>>>>
>> >>>>>>>> Karim
>> >>>>>>>>
>> >>>>>>>> On Sun, Oct 17, 2021 at 12:40 PM Doug Paradis <paradug at gmail.com
>> >
>> >>>>>>>> wrote:
>> >>>>>>>>
>> >>>>>>>> > Paul,
>> >>>>>>>> >      The correct address for the mailing list is
>> >>>>>>>> dprglist at lists.dprg.org.
>> >>>>>>>> > BTW, Karim has been working with GPS RTK and has used several
>> free
>> >>>>>>>> > correction data stations in the area.
>> >>>>>>>> > Regards,
>> >>>>>>>> > Doug P.
>> >>>>>>>> >
>> >>>>>>>> > On Sun, Oct 17, 2021 at 12:35 PM Paul Bouchier <
>> >>>>>>>> paul.bouchier at gmail.com>
>> >>>>>>>> > wrote:
>> >>>>>>>> >
>> >>>>>>>> >> Hi Doug - long time no see.
>> >>>>>>>> >>
>> >>>>>>>> >> I tried to send the email below to the dprg list. You can see
>> I
>> >>>>>>>> used the
>> >>>>>>>> >> address dprglist at dprg.org, which is what Carl told me to use.
>> >>>>>>>> It didn't
>> >>>>>>>> >> go through. Do I have the address wrong? Anything else you can
>> >>>>>>>> think of?
>> >>>>>>>> >>
>> >>>>>>>> >> Thanks for any ideas you might have
>> >>>>>>>> >>
>> >>>>>>>> >> Paul Bouchier
>> >>>>>>>> >>
>> >>>>>>>> >> ---------- Forwarded message ---------
>> >>>>>>>> >> From: Paul Bouchier <paul.bouchier at gmail.com>
>> >>>>>>>> >> Date: Thu, Oct 14, 2021 at 5:24 PM
>> >>>>>>>> >> Subject: RTK corrections source in DFW area?
>> >>>>>>>> >> To: <dprglist at dprg.org>
>> >>>>>>>> >>
>> >>>>>>>> >>
>> >>>>>>>> >> Does anyone know of any free or low-cost stations that provide
>> >>>>>>>> internet
>> >>>>>>>> >> access to GPS RTK corrections data for the Dallas/Fort Worth
>> >>>>>>>> area?
>> >>>>>>>> >> Apparently TXDOT has NTRIP servers and makes historical data
>> >>>>>>>> available but
>> >>>>>>>> >> AFICT doesn't provide live data. Looking for corrections data
>> to
>> >>>>>>>> feed to an
>> >>>>>>>> >> RTK receiver so I don't have to set up my own base station.
>> >>>>>>>> >> Thanks
>> >>>>>>>> >> Paul
>> >>>>>>>> >>
>> >>>>>>>> >
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>> >>>>>>>>
>> >>>>>>>> ------------------------------
>> >>>>>>>>
>> >>>>>>>> Subject: Digest Footer
>> >>>>>>>>
>> >>>>>>>> _______________________________________________
>> >>>>>>>> DPRGlist mailing list
>> >>>>>>>> DPRGlist at lists.dprg.org
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>> >>>>>>>>
>> >>>>>>>> ------------------------------
>> >>>>>>>>
>> >>>>>>>> End of DPRGlist Digest, Vol 62, Issue 1
>> >>>>>>>> ***************************************
>> >>>>>>>>
>> >>>>>>> _______________________________________________
>> >>>>>>> DPRGlist mailing list
>> >>>>>>> DPRGlist at lists.dprg.org
>> >>>>>>> http://lists.dprg.org/listinfo.cgi/dprglist-dprg.org
>> >>>>>>>
>> >>>>>> _______________________________________________
>> >>>> DPRGlist mailing list
>> >>>> DPRGlist at lists.dprg.org
>> >>>> http://lists.dprg.org/listinfo.cgi/dprglist-dprg.org
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>> ------------------------------
>>
>> Message: 2
>> Date: Wed, 20 Oct 2021 14:51:47 -0500
>> From: <pulcher at killercomputing.com>
>> To: "'DPRG D-List'" <dprglist at dprg.org>
>> Subject: [Dprglist] Thought this was a cool idea....
>> Message-ID: <019f01d7c5eb$eabe1070$c03a3150$@killercomputing.com>
>> Content-Type: text/plain; charset="us-ascii"
>>
>> No idea of really what to do with it.  As you don't generally all the pins
>> lining up in grouped enough ways...
>>
>>
>>
>> I haven't really looked at the groupings too hard, so they may be useful.
>>
>>
>>
>> AmazonSmile: RJ45 GPIO Pinout Breakout Board for Raspberry Pi 1A+ 1B+ 2B
>> 3B
>> 3B+ 3A+ 4B Zero-W : Electronics
>> <
>> https://smile.amazon.com/gp/product/B08PZ5H2BP?ref=em_1p_8_im&ref_=pe_37301
>> 40_609534790>
>>
>>
>>
>> Harold
>>
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>> ------------------------------
>>
>> Subject: Digest Footer
>>
>> _______________________________________________
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>> ------------------------------
>>
>> End of DPRGlist Digest, Vol 65, Issue 1
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>>
> _______________________________________________
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