Search found 522 matches

by vvp
15 Jun 2020, 14:50
Forum: Keyboards
Topic: is it possible to have a custom keyboard for around $200
Replies: 16
Views: 796

Re: is it possible to have a custom keyboard for around $200

Controller (MCU) is the heart of the keyboard - the electronic chip running firmware scanning keyboard matrix, debouncing and reporting changes to PC over USB. https://deskthority.net/wiki/Keyboard_controller https://en.wikipedia.org/wiki/Microcontroller Most keyboard projects use ATmega32U4. But yo...
by vvp
14 Jun 2020, 19:09
Forum: Keyboards
Topic: is it possible to have a custom keyboard for around $200
Replies: 16
Views: 796

Re: is it possible to have a custom keyboard for around $200

The things you cannot avoid is: 1) a controller (e.g. ProMicro will do most of the time) 2) switches and keycaps (possibly from a donor board) 3) either a plate or a PCB (if you have plate then you can hand wire and leave out PCB, if you have PCB and PCB mounted switches then you can leave out the p...
by vvp
07 Jun 2020, 21:07
Forum: Keyboards
Topic: Help building a board with Cherry MX low profile switches
Replies: 1
Views: 206

Re: Help building a board with Cherry MX low profile switches

I think standard stabilizers must work as well since Cherry ML travel is 3 mm (lower than Cherry MX travel of 4 mm). Edit: Actually probably not. PCB mounted Cherry MX stabilizers may not fit because Cherry ML is lower. But plate mounted Cherry MX stabilizers should work if you mount them on PCB wit...
by vvp
02 Jun 2020, 16:51
Forum: Keyboards
Topic: Idea for different Keyboard Matrix
Replies: 6
Views: 501

Re: Idea for different Keyboard Matrix

If you interested in the many ways how to scan a keyboard matrix then check:
http://www.openmusiclabs.com/learning/d ... -scanning/
by vvp
24 May 2020, 17:18
Forum: Workshop
Topic: Katy keyboard (or K80CS (Key80 Contoured Split))
Replies: 181
Views: 49548

Re: Katy keyboard (or K80CS (Key80 Contoured Split))

I indicated that the STL files of the case may be eventually free.
It is true for the K80CS version now.
You can download the K80CS STL files here.
Some electronics info is here.
The firmware source code is in on github.
by vvp
14 May 2020, 21:04
Forum: Keyboards
Topic: What do you think about this keyboard?
Replies: 24
Views: 1322

Re: What do you think about this keyboard?

The usual argument about TKL > full-size can be used here: that it allows moving a mouse on the right side closer to the middle, but here without losing the numpad. I think that having more keys on the left side to move around between could help another problem: that of holding the left forearm too...
by vvp
14 May 2020, 09:44
Forum: Keyboards
Topic: What do you think about this keyboard?
Replies: 24
Views: 1322

Re: What do you think about this keyboard?

I could see the picture.

The layout: There is no significant improvement compared to standard keyboards. Get an ergonomic keyboard with thumb clusters (Kinesis Advantage, Ergodox, ...).
by vvp
07 Mar 2020, 19:34
Forum: Keyboards
Topic: Variable weighting, potentially analog switch interest check
Replies: 10
Views: 767

Re: Variable weighting, potentially analog switch interest check

@kelvinhall05: Give it a try if you are going to enjoy the project. Just do not assume some kind of market for it. It is not about the price of magnets. You almost for sure can make it with springs, coils and iron cores only. It is more about how complicated the electronics and the firmware will be....
by vvp
07 Mar 2020, 10:50
Forum: Keyboards
Topic: Variable weighting, potentially analog switch interest check
Replies: 10
Views: 767

Re: Variable weighting, potentially analog switch interest check

Why latency? Lets assume that the key press time takes 10 ms. That is very on the quick side of typing. A standard 8 kHz PWM control loop will do easily. You will need at most 2 ADCs channels per key. It may be doable with one ADC per key. I'm not sure. The bigger problem will be probably the number...
by vvp
06 Mar 2020, 13:38
Forum: Keyboards
Topic: Question about 3D printed case
Replies: 10
Views: 625

Re: Question about 3D printed case

Recommendations in the order of importance: set the printer z-height and the first layer thickness better to minimize the problem while still having good bed adhesion chamfer the bottom of the model before printing it use an utility knife to cut/scrap the rim off (this is typically not needed if you...
by vvp
03 Mar 2020, 13:49
Forum: Keyboards
Topic: Variable weighting, potentially analog switch interest check
Replies: 10
Views: 767

Re: Variable weighting, potentially analog switch interest check

I have previously spent an idle moment speculating as to whether a pneumatic 'spring' could be used in keyboard switches. No, it would be too expensive. You would need precise components and good seals to avoid air leaking. And even with them you would need to add pressure from time to time. Moreov...
by vvp
10 Jan 2020, 22:42
Forum: Keyboards
Topic: Cherry Viola switch
Replies: 22
Views: 1913

Cherry Viola switch

OK, I do not care that much about switches. I think the overall keyboard shape and the layout are more important but some people do care about switches a lot and this may be interesting to them:
https://www.tomshardware.com/news/cherr ... ard-budget
by vvp
14 Dec 2019, 19:56
Forum: Workshop
Topic: Keyboards, Plastic, and Static Electricity
Replies: 6
Views: 545

Re: Keyboards, Plastic, and Static Electricity

Interesting. Application notes I read recommended to place EMI and ESD protection (diodes and low pass filters) as close to the source as possible (i.e. near the edge of PCB where signal enters). Only power distribution network requires also decoupling capacitors and those should be as near to the M...
by vvp
11 Dec 2019, 21:32
Forum: Workshop
Topic: Keyboards, Plastic, and Static Electricity
Replies: 6
Views: 545

Re: Keyboards, Plastic, and Static Electricity

Almost all electronic parts have EDS protection built in up to 2 kV at least. Human body model. I doubt you need more.
As for as ussage: do not touch the metal parts of the keyboard USB connector when you suspect you may be charged. Touch a ground wire of your electrical outlet first.
by vvp
08 Dec 2019, 01:59
Forum: Keyboards
Topic: Keyboard Review Template: Introducing the KeebScore™
Replies: 19
Views: 1245

Re: Keyboard Review Template: Introducing the KeebScore™

Actually, 10 points for switches and 10 points for a layout have some value. Keycaps have some value as well ... probably not full 10 points ... but still ...
by vvp
05 Dec 2019, 11:20
Forum: Keyboards
Topic: Keyboard Review Template: Introducing the KeebScore™
Replies: 19
Views: 1245

Re: Keyboard Review Template: Introducing the KeebScore™

Unsplit: -1000 Horizontally staggered: -1000 Flat: -10 No thumb keys: -50 MX mount: -100 Less than 2mm travel: -500 +1 Ergonomics is completely missing for the KeebScore. It is a score which needs to be introduced so that we can somehow differentiate keyboards which are already almost the same anyw...
by vvp
27 Nov 2019, 21:47
Forum: Keyboards
Topic: Keyboard Firmwares: a survey of controllers and converters
Replies: 15
Views: 1074

Re: Keyboard Firmwares: a survey of controllers and converters

Which firmware to use? Chris' firmware: https://github.com/chrisandreae/keyboard-firmware or my branch of it: https://github.com/hercek/keyboard-firmware Features: Almost no community. Chris did respond to my questions when I had any. I can respond to questions about my branch. Uses LUFA or vusb (s...
by vvp
23 Nov 2019, 22:16
Forum: Workshop
Topic: Keyboard Photogrammetry
Replies: 73
Views: 5026

Re: Keyboard Photogrammetry

Interesting.
How many photos were used for one scan?
by vvp
08 Sep 2019, 18:37
Forum: Keyboards
Topic: VAT and Customs; shipping a keyboard ti USA
Replies: 13
Views: 2123

Re: VAT and Customs; shipping a keyboard ti USA

An European company must ship it to you without VAT. You will pay price without VAT at the time of ordering. If here are any import duties for keyboards in USA then you will be paying them when the keyboard arrives to USA. There is no VAT in USA so you will not pay any VAT but import duties may be a...
by vvp
03 Sep 2019, 11:44
Forum: Workshop
Topic: My first handwired keyboard ever!!!
Replies: 12
Views: 3816

Re: My first handwired keyboard ever!!!

If you send only one pulse to a piezo-buzzer then it sounds a bit like a click. It is rather silent though.
by vvp
25 Aug 2019, 20:51
Forum: Workshop
Topic: Ground problems with handwired boards?
Replies: 12
Views: 1542

Re: Ground problems with handwired boards?

So, my pc chassis should be connected to earth through the 3 pin plug. Yes, that is protection by grounding. It is required by law ... probably in about every country. Should I expect the exterior of the usb ports (== the shielding ground, as I understand it) to have continuity with the chassis? Ye...
by vvp
25 Aug 2019, 10:10
Forum: Workshop
Topic: Ground problems with handwired boards?
Replies: 12
Views: 1542

Re: Ground problems with handwired boards?

In other words: if your keyboard requires a shielding ground to be connected to anything then you are likely having some other problem which this connection somehow mitigates. An example is a poor connection on the signal ground.
by vvp
25 Aug 2019, 10:08
Forum: Workshop
Topic: Ground problems with handwired boards?
Replies: 12
Views: 1542

Re: Ground problems with handwired boards?

There are two grounds on an USB connector: Signal ground. This must be connected to the MCU ground . Shielding ground - this should be connected to the shielding of your keyboard case if it has any shielding at all. Most cases do not have any shielding (e.g. because they are plastic). In such case, ...
by vvp
15 Jul 2019, 10:10
Forum: Workshop
Topic: PSA: Soarer's "Simple Logic Analyzer" exists and it's awesome
Replies: 7
Views: 1664

Re: PSA: Soarer's "Simple Logic Analyzer" exists and it's awesome

Well, maybe people do not use it because there are more comfortable alternatives and even cheaper ones (definitely when you want to make it from $20 teensy). But you can go with ProMicro for $4 and a bit of soldering, firmware burning and rather awkward waveform extraction. Or you can buy $6 Saleae ...
by vvp
12 Jul 2019, 10:17
Forum: Workshop
Topic: Low profile Beamspring project
Replies: 38
Views: 6142

Re: Low profile Beamspring project

FreeCAD is quite usable. Considerably slower than commercial alternatives though. By slower I mean that there is still too much manual work which could be done automatically by the program (e.g. it does not guess the right constrains when drawing sketches). Also the OpenCascade (on which FreeCAD is ...
by vvp
04 Jun 2019, 11:06
Forum: Keyboards
Topic: Send language layout from USB HID keyboard
Replies: 9
Views: 1033

Re: Send language layout from USB HID keyboard

...different layouts that you want on different layers... The problem is that language-layout is interpreted by the host, not the keyboard. That is only a problem if one cannot get a generic super set of all layouts working. Like Compose key or unicode hex input. Then you can issue any key using th...
by vvp
01 Jun 2019, 20:41
Forum: Keyboards
Topic: Send language layout from USB HID keyboard
Replies: 9
Views: 1033

Re: Send language layout from USB HID keyboard

Not without a a custom driver. You can write some macro which will do it for you or an application which will switch the layout after some special input (e.g. on F13). And you can use something like Compose key or Unicode hex input to simulate changing layouts. Compose key support is native in linux...
by vvp
26 May 2019, 23:59
Forum: Workshop
Topic: Adding a beeper/buzzer to a Teensy/TMK
Replies: 5
Views: 788

Re: Adding a beeper/buzzer to a Teensy/TMK

You did not say which Teensy it is. Different versions have different MCUs. Anyway I drive a piezo buzzer directly from an MCU pin and it works ok. I'm still using only about 1/3 of the pin current capacity. Compute the maximum current your buzzer will need and if you are bellow the pin current rati...
by vvp
15 May 2019, 22:57
Forum: Keyboards
Topic: Post a picture of your ideal keyboard layout!
Replies: 466
Views: 52814

Re: Post a picture of your ideal keyboard layout!

Splitting space bar is a move in the right direction!

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