The pitch on the longer connector on the R4 is NOT 0.1"

Official Hardware UNO Family UNO R4 WiFi
21

Yeah, well, please read the post more accurately. This is NOT about the well-known spacing issue between the two connectors. This is about the pin-2-pin pitch within just 1 connector.

I've checked R2 boards, R3 boards, ATMEGA boards, maybe 10 versions in all, and none of them have this issue. I've checked maybe 20 shields from Adafruit and a string of others, and none of those have this issue. So, I seriously doubt this goes back to 2005 / per what I can tell this is an R4-only issue.

The only board (in my collection) that has this issue is the R4, so that is why I put it into the R4 forum.

22

There used to be two separate connectors with 8 or 10 pins. Each was 0.1" pitch.

It's only because Arduino have gone to the expense of having a custom made connector with 18 pins, to replace 2 connectors that rob_kr's perceived problem arises.

However these custom connectors have been used for a long time now.

23

... or just avoid it, since shields are really optional, almost anything that exists as a shield can be obtained as a module. The electrical/mechanical design doesn't really support stacking in a practical way, also adding even a single shield often means some pins are blocked to outside connections.

I have yet to be excited about any shield, except the Multifunction which is cool because of the incredible bang to buck ratio, and a lot of features a new experimenter can play with.

24

The only shield i use is for screw terminals. Those connectors are for other connectors, not loose duponts.

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25

ISO9000 has nothing to say on this - it is a standard for quality management systems that is not specific to any technology. If there was such a requirement it would either be IEC or regional I think. But as the early post from Arduino shows, actually it was due to a mistake and we have been living with the consequences ever since.

26

Ah, I forgot proto shields... that is the #1 useful application for them, I have used dozens of them, Uno and Mega both.

27

I don't have an R4, but I have a question. Is it the pitch of the connector sockets or that little space between 7 & 8 ? If so it means someone went out and bought a new mold for those connectors.

28

Yes the spacing has always been like this.
You can get special prototyping boards with this spacing.

I must say I am surprised that a special header socked was made to accommodate this, it is surly not a standard part.

I was also highly delighted at the printing on the side of this socket, it will make photographs of wiring much easier to see.

Here is a picture of a prototype board being partially inserted, see how the fit is perfect.

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This is the PCB prototype board that fits a MIDI input on it. (no opto isolator) as I used it on another project.

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Note that this prototype board had a pin fitted that would drop into the space between the two sets of connectors. If you had this then just snip it off.

29

This seems to be the point at which @rob_kr left the discussion - presumably on realising what's actually going on ... ?

ie, that there is no problem and the R4 does fully match the standard, long-established UNO pin spacing.

:thinking:

30

Well he does say in his deleted post, and in the original post

However, I still have to disagree with him.
This is the photograph of the other side of my prototype board, and it fits just as snugly as the other side.

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No bending at all is involved, let alone "the cr@p", and it is a solid fit.