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Why 3.5mm TRRS? (sopuli.xyz)

submitted 6 months ago* (last edited 6 months ago) by Tiuku@sopuli.xyz to c/splitmechkeyboards@lemmy.world

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All split keyboards I'm aware of connect the halves with 3.5mm TRRS jacks, if not wireless. QMK and ZMK boards alike. Why is that?

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[–] eksb@programming.dev 8 points 6 months ago* (last edited 6 months ago) (1 children)

They provide the required number of wires, the jacks are readily available and cheap, the cables are readily available in various lengths, the cables are flexible, and look classier than RJ9.

[–] Tiuku@sopuli.xyz 3 points 6 months ago (1 children)

Yeah they are a common'ish piece of equipment which sure helps.

I wonder what kind of protocol they are using on the wire?

[–] halfdane@piefed.social 3 points 6 months ago

Zmk uses i2c - I would guess qmk as well, but I wouldn't know