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Hello UM community,

I'm interested in a project that will require some of the digital I/O off the UM2 mainboard. I noticed in the schematics that there are two expansion headers (EXP1 and EXP2).

Two questions:

1. I couldn't find the actual connector used. Would something like this mate to it properly or is there a better / correct header I should be using?

2. I noticed in the schematics that several of the pins in EXP1 are labeled more specifically. Can these be used as general purpose I/O?


Thanks a ton!


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There are definitely quite a few extra signals.  I'm not sure which ones are extra but the ones on EXP2 look more likely as some of the ones on EXP1 might be used dual purpose.  So double check that.  That connector you link to is a .1 inch spacing which is almost certainly correct.

So I can't actually verify anything but I think you are on the right track.

Edit: oops - exp1 and exp2 I guess are for the display and sdcard reader. But I'm sure there are more signals available somewhere.

Edited by Guest

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Exp1/2 are the ones that the board uses to connect to the ulticontroller.

Checking the github of the ulticontroller there's info about the connector part number

TE connectivity 1-1634689-0


Wow it even has the rs-components number:



Edited by Guest

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