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* Preparation and Cost
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Get all the parts / raw material
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- For the 3D printing there are two options:
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1. Filament, which is the basis for 3D printing. Luckily I could print at my work-place
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which reduced the cost from 210€ to 70€
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2. Buy the printout of adareth's model at shapeways for 210€ over here
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http://www.shapeways.com/designer/adereth/creations
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- Decide on the switches
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- If you are going to invest a whole lot of time and money for a custom keyboard instead of
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buying one for 10€ I'd recommend to use your favorite switch-type. To make a
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well-informed decision I bought a switch-tester for this from massdrop and decided on
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Cherry MX Whites. https://www.massdrop.com/buy/varmilo-switch-tester-with-anodized-case
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- I ordered 70 Cherry MX Whites from here:
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https://mechanicalkeyboards.com/shop/index.php?l=product_detail&p=847
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- Decide on the key caps
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- On the glamour-Shot you can see the 1976 keycap set, it used to be sold over here:
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http://pimpmykeyboard.com/sa-1976-keycap-set/ but the link is dead right now. You could
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try this link: https://www.massdrop.com/buy/nineteenseventysix-sa-keycap-set but it is a
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massdrop which is way different from usual online-stores. If you find a site that sells
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these make sure you get the right amount and type of keys according to the layout
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- I got the "TKL Base Set + TKL Modifier" from over here:
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http://pimpmykeyboard.com/dsa-pbt-abs-blank-keycap-sets/ but I'm still too long keys
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short, I will have to order those specifically and I have a bunch of keys I don't use
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left-over.
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- The USB-Cable that connects the keyboard to your computer
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- It's an USB 2.0 to USB Mini-B cable, make sure you get one that is 2 meters long, it
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really makes handling the keyboard so much more comfortable
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- https://www.amazon.de/gp/product/B00NH11N5A/
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- The main controller (right half)
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- A Teensy 2.0, i got that one from here: https://www.pjrc.com/store/teensy.html
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- The chip, connectors and cable to give life to the left half
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- TTRS cable and jacks
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- Got my TTRS cable from here: http://www.digikey.de/product-search/de?keywords=839-1257-ND
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- Got my TTRS jacks from here: http://www.digikey.de/product-search/de?keywords=CP-43514-ND
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- MCP23018 16 bitIO Expander
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- Got mine from here: http://www.digikey.de/product-search/de?keywords=MCP23018-E%2FSP-ND
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What I spend on my keyboard (should give you a rough estimate for your build):
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| item | cost |
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|-----------------------------------+------|
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| filament | 70 |
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| switch-tester | 30 |
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| key-caps | 70 |
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| teensy 2.0 | 30 |
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| switches | 60 |
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| usb cable | 10 |
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| IO Expander, TTRS jacks and cable | 30 |
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|-----------------------------------+------|
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| overall cost | 300 |
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#+TBLFM: @9$2=vsum(@2$2..@8$2)
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My choices / advantages:
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- Using the soldering iron at the uni-workshop for free
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- 76 Diodes for free
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- Soldering wire and copper for free
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- All the resistors used for free (5 resistors are used)
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- Several files for working out the rough edges of the 3D-printout
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Depending on what you have available you might spend more or less money than me, 300€ however
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is a good rough estimate.
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* Dactyl Flexible PCB Rough Guide
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[[workbench.jpg]]
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For now, take a look at the images and try to figure things out, I know
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that's not great (it's better than nothing!)
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** Making the PCB
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Get two sheets of 6in square Pyralux™. Use the Toner Transfer method to
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etch the Pyralux sheets as you would a usual PCB
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#+BEGIN_QUOTE
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NOTE: If you only have an Inkjet make photocopies of the print out,
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voilà Toner based copies!
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#+END_QUOTE
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[[http://www.instructables.com/id/Toner-transfer-no-soak-high-quality-double-sided/][Here'sa handy toner transfer guide ...]]
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Print these PCB designs out...
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Left hand:
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[[left-hand-pcb-pyralux.png]]
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Right hand:
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[[right-hand-pcb-pyralux.png]]
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When you're done etching, you'll need to carefully cut the pcb into
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pieces... See the images below.
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** This is Madness...
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The thumb cluster pcb for the left hand:
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[[madness.jpg]]
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Solder the MCP like so:
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[[left-hand-mcp-1.jpg]]
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[[left-hand-mcp-2.jpg]]
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Solder the Teensy 2.0 like so:
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[[teensy-1.jpg]]
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Some interesting pull up 10k resistor business here... (TODO add a small
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diagram and notes)
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[[teensy-2-fuxor-reziztorrs.jpg]]
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Each hand of the keyboard will wire up like so:
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[[right-hand-pcb-1.jpg]]
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Teensy goes here... note the rows soldered to the teensy via the
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Pyralux:
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[[right-hand-pcb-with-teensy.jpg]]
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Here the left hand:
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[[hotglue-left-hand.jpg]]
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That's all for now, this guide will improve over time! (TODO!)
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