Re: TOHKBD rev2
 

What, you haven't got used to Jolla's definition of "soon" yet? ;)

Re: TOHKBD rev2
 

I think context is important here... the mid April statement was made before over reaching the goal of the project and adding more colours/options, so things obviously take longer.

Re: TOHKBD rev2
 

well no, keypad production is the bottleneck.. which is also the only component that we had no idea how long it would take.

now at workshop soldering keyboard pcbs

Re: TOHKBD rev2
 

Thanks for clarifying :) Although I would have thought that with more units requested, this task would take longer :)

Nice, I can't wait! :)

Re: TOHKBD rev2
 

Currently 48 TOHKBDs left in the shop.

When the time comes to assemble I will go in priority order mentioned before, funkyoh orders last. Like every other project, this is a batch process. So after the batch, no more.

I will have lot of spares left though, which means I will be offering TOHKBD in kit form, casings not included, some soldering and assembling.

Re: TOHKBD rev2
 

Do not forget about special developer and signature editions ;)

Re: TOHKBD rev2
 

I never forget devs and signature edition looks awesome.

Re: TOHKBD rev2
 

I just had a look at the eagle schematics and board files and some questions arose:

• "TOH Technical Specifications" from Jolla define some antenna keep out areas. The document says: "avoid anything else than pure cover plastic on those areas to keep antenna performance intact." If I understand the board layout correctly there are two ground layers covering these areas. Don't these shield the antennas?
• VDD, SDA, SCL, INT and GND are directly routed from the phone to the contact surfaces. What happens when I have my Jolla with some metal (e.g. my keys) in a bag without the keyboard attached? These contacts are quite exposed and could easily be shorted. 3.3V output is switchable but I suspect it is turned on as soon as the back cover is in place and the corresponding software is installed and executed. SDA, SCL and INT use 1.8V level. Wouldn't 3.3V on that pins damage the phone? At least the EEPROM used on the TOHKBD can only manage VCC+0.5V resulting in 2.3V applied to its input pins according to a data sheet I found. Wouldn't this be damaged if SDA or SCL were shorted with 3.3V? I could not find any reference to a protection circuit inside the phone.

@dirkvl: If you plan on drilling the pad holes manually into your self made PCBs you should use 'drill-aid.ulp' to have small holes in the center of the pads. The thickness of the copper layer helps to keep the drill centered while drilling.

Re: TOHKBD rev2
 

Yes this is something I realized after ordering and soldering all the pcbs.. But in my use here I have noticed no issues whatsoever in signal strength, so hopefully in the less signal-generous areas this will not cause issues. But again, no signal issues on this side.

Check the connection detector sequence on the github, power is cut off when the keyboard is not connected. Should be fine!

Yeah I am just getting started, but there is already some drilling stuff in the gerbers. :)

Re: TOHKBD rev2
 

Damn! Well, you can't think of everything. I hope I too won't see any less signal strength.

Did that now. Only thing I can imagine to lead to a hardware fault would be to short GND to INT pad and also 3,3V to one of SDA/SCL at the same time. This could possibly damage your EEPROM and phone because 3,3V would be switched on for a short time when pulling INT to ground.

BTW: What PNP transistor do you use? I'd like to check the collector-emitter-voltage ;) (I ended up making a small "simulation" using falstads electronic circuit simulator. The attached file can be opened with it.)

The drills/holes in Gerber files do contain the diameter that fits the THT device's pins. For manual drilling (without CNC) it's handy to etch a 0,1-0,3 mm hole in the copper layer so the drill centers itself. See drill-aid.ulp ;)