deskthority

I've been poking my working F with an oscilloscope this morning and I'm just writing another post about it.

At least with the stock controller methodology I'm pretty sure it will make it easier to detect. The detection window is pretty short compared to the rest of the duty-cycle.

idollar wrote:Also notice that the pcb will be 0.4 mm. This means that the keyboard will be approx 0.2 mm higher than normal.
I will try a plate with this thick and test the complete set in the case before ordering.

I thought the F was .8mm?

That will double your capacitance. Is that intentional?

That's actually a pretty good price. Who are you using?

Okay, so there is an actual need then other than my late-night thoughts. YOu may be able to do some kind of auto-calibration power key. I'll order some a2d this evening from element14 and try to write some code tomorrow evening. I'll use an old F122 as my test board. IC I'm looking at is only availa...

Well I'm glad to hear it's not too far out of left field and cost was really what I thought was the driving factor too, especially given how horrifically expensive ROM was in those days. Now you can get an 8 channel 8 bit A2D for under $2. We could still have auto-calibration I think if we were to a...

Some 3am thoughts, they may not be completely coherent :-) Back with God was typing "Let there be light" on his beamspring and Adam and Eve invented the F and Cain Killed Abel for inventing the rubber dome, analog covered the Earth. A fair amount of complexity of the boards that we have are due to t...

infodroid wrote:

Muirium wrote: ↑Here's a thought experiment. Imagine a keyboard so vast that you never had to press any chords at all.

The "diabolical" Hyper7 comes to mind:

All those keys and a tiny spacebar? /* shakes head */

idollar wrote:And also ... it managed to import the design into Diptrace

Screenshot-diptrace.jpg

We are getting there.

Are you wanting to put the design in 0.62"? Remember, you don't want your circuitry inside the metal sandwich.

Mainly because the solder joints won't survive being curved.

mr_a500 wrote: ↑"At the end of the day", I use the same keyboard that I use at the beginning of the day - my IBM 3278:

I think you just posted a photo of my new love... now, where would I find such a beastie...

I'm happy to share the files with the disclaimer to assume they're junk until I get my prototype back and tested as working. smallerboard.png 1.05" x 2.9". Now I just need mounting holes of an unknown size... The next question will be: "If I want to add that to my PCB then how do I route my rows an...

I'm curious as to your aversion to diptrace. It does run on Linux after all. fwiw, I have a completed schematic for the xwhatsit controller and I will tell you that validating that by hand between kicad and diptrace was hell. I'm about a quarter of the way through routing it on a smaller board swapp...

Conversation is ensuing...

No worries __red__! Despite this being a $70,000+ project judging by current interest (220+ preorders), this is considered a really small project for factories and everything needs to be ordered in one or two batches to get the price down to $325 per keyboard. Tooling involves the effort to set up ...

Do you want me to place it on your existing pcb design for the keyboard or separate so you can prototype with it? Did you end up using diptrace to design your board thus far? Unless you have a really compelling reason to keep it on the same board I would strongly recommend having them separate. Boar...

I'm curious, why only a two month window? Surely the expense and effort is mostly in the tooling?

Forgive me if I glossed over something previously discussed.

Forgive me if someone had asked this already but any chance you'll be selling barrels, flippers, springs separately?

If so, any idea of pricing at the couple of hundred Mark?

Got a link to the original schematic handy?

The answer is yes btw.

Model F-122 at work with the layout a bastardized combination of iso and ansi. Model M-122 by one of the off-label brands (BOS? iirc) at home. F is at work because that's where I do most of my keyboard work. Should you worry about F or M noise in an open plan office? Nope, you spread the love. There...

I would ask my wife's opinion but it would make me look bad.

Great project here wcass - I'm excited to see how it goes. Random questions if I may: i) Gold plated or copper? ii) Do you have a "punched" acrylic sheet or something between your top layer and your PCB so that gravity doesn't activate all the keys for you? As you're making your board out of acrylic...

http://github.com/redvers/isokeyboard

Some example PCBs there.

I'm actually building up an ansi IBM Model M layout PCB for my own experimentation. After I've finished routing it I'll post it here to let you know.

You can also send your gerbers to china and get 10 boards for 90c each. Predictable, repeatable etc...


Red

dox wrote:Update! The first prototype is done but the diodes are backwards .

Been there, done that.

However, since I wrote the firmware I was able to cheat and reverse the rows and columns.

Nice work though... Seriously.