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Socoder -> Hardware and Technology -> Building a Touchable Keyboard

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Posted : Thursday, 04 July 2019, 04:44
spinal
I have a crazy idea for a project that needs a keyboard, can't get an old xbox chatpad to work with arduino for some reason, I wonder if I got an lcd with touch screen, would it be easy to remove the touch screen and use it by itself with a paper keyboard drawn behind it...

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Posted : Thursday, 04 July 2019, 04:44
Jayenkai
Is removing the touch section easy to do? Guess it depends on the type of screen and manufacturer..

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Posted : Thursday, 04 July 2019, 05:03
Jayenkai
Did a quick Amazon search for "Tiny Keyboard", and this popped up..
*shrugs*

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Posted : Thursday, 04 July 2019, 05:40
spinal
Actually, the idea would be a handheld c64. I'm about 50% sure that a raspberry pi zero would run the emulator no problem, the screen might be tricky to get a constant 50fps, unless I get a really cheap hdmi screen.
I'd prefer a real keyboard, but I can't find a small enough USB keyboard.

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Posted : Thursday, 04 July 2019, 06:10
Jayenkai
HDMI?
Are you not better off with a smaller resolution, for faster performance?

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Posted : Thursday, 04 July 2019, 06:54
spinal
Probably, I probably need one of those 480x320 ones for pixel perfect though.

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Posted : Thursday, 04 July 2019, 07:33
Jayenkai
As for the keyboard.. Create a cheap membrane and get a C64 Mini, then sit there and cut all the little keys out until you've built a actual physical tiny C64 keyboard!!

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Posted : Thursday, 04 July 2019, 13:34
spinal
I'm hoping to keep the cost down as much as possible. cutting up a c64 mini wont do that

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Posted : Friday, 05 July 2019, 07:48
Dan
Sidenote:
I have got an Wireless Xbox 360 S joypad. I have noticed that it turns itself off after few mins of inactivity - (even if it is used wired (haven't tried it without the battery)) . (pps: have not tried to connect it over bluetooth, or better said - could not connect it/use it in this way)

Well few (maybe all) emulators on the RPI 3 b+ do not like this, and when the xbox pad turns itself off, only exiting the emulator and going back to the emulationstation and back to the emulator makes it work again.

So i have got another xbox wired controller, and sofar it worked ok.
Posted : Monday, 08 July 2019, 16:28
Jayenkai
Had any luck with this?
Posted : Tuesday, 09 July 2019, 00:14
spinal
Nope. Not with the 360 chatpad. Problem is that you can't use one with windows (I don't have an xbox 360) so I can't even let it init and check what signals get sent. Not to worry though, it was only 50p, so I'm not out of pocket
I was thinking of building a keyboard from scratch, or maybe even just grab a cheap tiny bluetooth keyboard, only problem there is the key layout.

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Posted : Tuesday, 09 July 2019, 02:00
rockford
I know money is an object, but the BT Pokemon keyboard is going cheap on eBay

qsAAOSwB99dFI0O" target="_blank">https://www.ebay.co.uk/itm/POKEMON-TYPING-ADVENTURE-WITH-BLUETOOTH-KEYBOARD-FOR-NINTENDO-DS/163754419490?hash=item2620862522:gqsAAOSwB99dFI0O

or this -

eIAAOSw9GNc-5Fp" target="_blank">https://www.ebay.co.uk/itm/MINI-SLIM-BLUTOOTH-KEYBOARD-SMALL-TABLET-MOBILE-THIN/143286675369?hash=item215c8d27a9:geIAAOSw9GNc-5Fp
Posted : Tuesday, 09 July 2019, 02:35
Jayenkai
The Pokemon keyboard isn't actually all that small, though! It's a good sized keyboard, and if you can pick one up cheap, is handy for emergency typing!!

..But I can't get it working with the Switch, which was a bit of a bummer.



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Posted : Tuesday, 09 July 2019, 04:57
spinal
The plan is for something handheld, which was why I thought of the chatpad. A DIY usb keyboard should be possible, but I would also need a DIY gamepad of some sort also .

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Posted : Tuesday, 09 July 2019, 06:15
rockford
I actually have the Pokemon game and keyboard, but never opened the box.

Got it from Argos for £10.

|edit|
And yes, looking at the size of it against the A600, it doesn't seem that small!
Posted : Tuesday, 09 July 2019, 14:06
spinal
OK here goes.... Just ordered the 2 cheapest 320x240 screens I could fine that are being sold on this side of the world (for delivery speed reasons, china often takes a little while).
The plan is to use one as my actual screen, the other will be a touch keyboard, using something like this...

for the graphic.

I Think this will be a fun project.

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Posted : Tuesday, 09 July 2019, 15:02
Jayenkai
Good luck!
Posted : Tuesday, 09 July 2019, 19:41
rockford
What type of touchscreen are you using - capacitive/resistive?

That touchscreen keyboard won't be usable/accurate at all with capacitive (when I developed for HP they recommended a minimum of 40x40 pixels for touchscreen buttons - much more if possible) and probably not for resistive either - the keys may be too small. You might want/need to enlarge the keyboard and relocate the side function keys.

But hey, I'm really interested in what you can come up with. And as Jay said, "Good luck!"
Posted : Wednesday, 10 July 2019, 07:24
spinal
...the cheap kind...

... Resistive. This is mostly just a test though, I don't mind using a stylus, perhaps you're right though.



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Posted : Saturday, 13 July 2019, 08:48
spinal
I ordered a couple of level shifters just in case my pro micro doesn't play well with the screen.
Remember people, if you select free postage you never know when your items will show up!

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Posted : Saturday, 13 July 2019, 14:39
steve_ancell
It'll be interesting to see how your touchpad project pans out, I reckon it'll prove to be a lot more practical than those boring 8x8 matrix keypads.
Posted : Saturday, 13 July 2019, 17:37
spinal
It'll be limited to only one key at a time, but on a c64 that won't be much of a negative. I'll use sticky shift and any other keys that might need it.

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Posted : Sunday, 04 August 2019, 09:09
spinal
One of the screens has arrived. It's a little smaller than I imagined so I think stuffing this contraption inside a DSlite case might be out of the question, not to worry though, the first round will be mostly a test to see if it's something I can actually do. After which I'll decide if it needs an upgrade.

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Posted : Thursday, 08 August 2019, 02:11
Jayenkai
How small can you get things?!

What if you made a teensy tiny keyboard roughly the size of a GBA cart, and had it slide in and out of the cartridge port of a GBAsp?
Would definitely need a stylus for tapping the tiny keys, though!

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Posted : Thursday, 08 August 2019, 10:08
spinal
Looking at how the screen looks now, I think larger would be better. Each 'button' is about 5mm accross.

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