### Author Topic: Multiple External Keyboards  (Read 2257 times)

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#### p2

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##### Multiple External Keyboards
« on: August 17, 2016, 04:26:02 am »
I know only the last quetion is about Axe, but I wasnt sure where else to put that post ^^

As some of you may know, TI produces external keyboards for their calculators:
https://www.amazon.com/Texas-Instruments-Keyboard-Graphing-Calculators/dp/B00007K7JE/s=electronics
They're pretty cool since they're connected using the simple 2.5mm audio plug.
My idea was using multiple of these keyboards at the same time for multiplayer purposes, using audio splitters
(Like using little adapter (2.5mm->3.5mm), a 3.5mm Audio Split and another adapter (3.5->2.5mm)
Code: [Select]
[KB]--[2.5->3.5]--.                   >[Audiosplit]--[3.5->2.5]--[Calc][KB]--[2.5->3.5]--'Has anyone of you ever tried this out and did it work? And could I (theoretically) use an unlimited number of keyboards?
Aaaand... Does Axe properly work with them...? >.<
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#### E37

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##### Re: Multiple External Keyboards
« Reply #1 on: August 17, 2016, 08:56:45 am »
I know only the last quetion is about Axe, but I wasnt sure where else to put that post ^^

As some of you may know, TI produces external keyboards for their calculators:
https://www.amazon.com/Texas-Instruments-Keyboard-Graphing-Calculators/dp/B00007K7JE/s=electronics
They're pretty cool since they're connected using the simple 2.5mm audio plug.
My idea was using multiple of these keyboards at the same time for multiplayer purposes, using audio splitters
(Like using little adapter (2.5mm->3.5mm), a 3.5mm Audio Split and another adapter (3.5->2.5mm)
Code: [Select]
[KB]--[2.5->3.5]--.                   >[Audiosplit]--[3.5->2.5]--[Calc][KB]--[2.5->3.5]--'Has anyone of you ever tried this out and did it work? And could I (theoretically) use an unlimited number of keyboards?
Aaaand... Does Axe properly work with them...? >.<

I guess it could work assuming you have a way to differentiate the keyboards. I suppose there is a limit eventually...
What would you use more than 2 keyboards for anyway?
Axe should work fine assuming you have a way to tell the keyboards apart.
I'm still around... kind of.

#### p2

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##### Re: Multiple External Keyboards
« Reply #2 on: August 18, 2016, 03:56:39 am »
I was thinking about maybe use arrow keys on one keyboard and WASD on another keyboard ^^
so multiplayer games like 1:1 would be possible enen using only 1 calc ^^
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#### Sorunome

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##### Re: Multiple External Keyboards
« Reply #3 on: August 18, 2016, 05:14:00 am »
As E37 already pointed out, you'd need to be able to differentiate the keyboards. But even more, the protocol that the keyboards are using needs to support multiple in serial. Think of USB - when plugging multiple things into the same port you need a hub, you might need to build something like a hub with a different microcontroler.
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