mikkelsonr
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RPi, 26 pin GPIO and Mounting Holes

Tue Jan 29, 2019 11:44 pm

I am looking for an original Raspberry Pi Model B with 26 pin GPIO and the mounting holes. I have a Geekroo Fairywren and need a RPi that will fit it. I am in USA, so something available in the USA would be preferred, but not required.

Thanks, Rolf.

pcmanbob
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Re: RPi, 26 pin GPIO and Mounting Holes

Wed Jan 30, 2019 10:01 am

Hi.

As the original pi with the 26 pin gpio is no long produced you are probably going to have to look to the second hand market.

Ebay normally has some listed but you could try other second hand sales sites too.

example

https://www.ebay.com/itm/Raspberry-Pi-M ... ondition=4
https://www.ebay.com/itm/RASPBERRY-PI-R ... ondition=4
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Earlton2
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Re: RPi, 26 pin GPIO and Mounting Holes

Wed Jan 30, 2019 10:07 pm

Would it help to simply purchase a Pi-Zero sans pins and solder in the 26 you need?
Or purchase a 40-pin Pi and chop off the unwanted pins.
The Pi's don't care.

I often just solder in a 10-pin header on a Pi-zero. The top position (pin-1) gets you power, I2C and serial data which is sufficient for some of my circuits.

Best check the first 26-pins haven't changed around from then to now.
I thought the only change was the additional pins were on a separate connector on the back and are now on the front in-line with the original 26.

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Imperf3kt
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Re: RPi, 26 pin GPIO and Mounting Holes

Wed Jan 30, 2019 10:26 pm

The original model b Pi uses different mounting holes, so no, the OP cannot do that.
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drgeoff
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Re: RPi, 26 pin GPIO and Mounting Holes

Wed Jan 30, 2019 11:20 pm

The very first RPis did not have mounting holes.

A couple of the GPIOs were changed as new models were introduced See diagrams at https://pimylifeup.com/raspberry-pi-gpio/.

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rpiMike
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Re: RPi, 26 pin GPIO and Mounting Holes

Thu Jan 31, 2019 12:00 am

You could probably use a GPIO riser to lift the GPIO connection, then build a mounting hole adapter to convert old Pi1 mounting holes to latest model mounting holes.

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Imperf3kt
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Re: RPi, 26 pin GPIO and Mounting Holes

Thu Jan 31, 2019 12:09 am

drgeoff wrote:
Wed Jan 30, 2019 11:20 pm
The very first RPis did not have mounting holes
Then what is the purpose of the two holes in the 2011 RPI 1B board?
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HawaiianPi
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Re: RPi, 26 pin GPIO and Mounting Holes

Thu Jan 31, 2019 12:38 am

My GF has one of the early 512K Raspberry Pi Model B Rev 2 boards. I can ask if she wants to let it go. Coincidentally, I was just messing with it and an old 3.5" PiTFT screen, so I know it still works.

Rev 2 is model on the right in this pic (has mounting holes).
Image
We are in the USA (Oregon).

Imperf3kt wrote:
Thu Jan 31, 2019 12:09 am
Then what is the purpose of the two holes in the 2011 RPI 1B board?
The very first revision did not have holes. The Rev 2 boards started that. See pic above.
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DirkS
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Re: RPi, 26 pin GPIO and Mounting Holes

Thu Jan 31, 2019 10:01 am

Imperf3kt wrote:
Thu Jan 31, 2019 12:09 am
drgeoff wrote:
Wed Jan 30, 2019 11:20 pm
The very first RPis did not have mounting holes
Then what is the purpose of the two holes in the 2011 RPI 1B board?
The holes were introduced in the second incarnation of the Pi1B.
And they did not start life as mounting holes. They were used during production/testing.

hippy
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Re: RPi, 26 pin GPIO and Mounting Holes

Thu Jan 31, 2019 3:22 pm

DirkS wrote:
Thu Jan 31, 2019 10:01 am
The holes were introduced in the second incarnation of the Pi1B.
And they did not start life as mounting holes. They were used during production/testing.
https://www.raspberrypi.org/blog/upcomi ... d-revision
Two 2.5mm (drilled 2.9mm for M2.5 screw) non plated mounting holes have been provided to assist with ATE test mounting ...

Warning: If used to permanently mount the PCB – do not over tighten screws or drill out to fit larger screws, as this will lead to damage to the PCB.
So not really mounting holes, but can be used as such with care.

I believe the Pi B+ was the first board with proper mounting holes intended to be used as such.

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