Jan 16, 2017
Focus has switched from a membrane based keyboard to a micro-sized mechanical keyboard. Both options will continue to be developed and hopefully the possibility of them merging into a single board design is possible. The mechanical keyboard design will likely also spin off into its own project, with updates making their way back into nbPi.
Add open-source keyboard project references
A mini mechanical keyboard with 3D printed key-caps
A matrix keyboard with contact pad alignment for use with a keyboard membrane, specifically the one from the T-Mobile G1/HTC Dream
These links below are references and resources used to create the keyboard section of the nbPi.
http://rc2014.co.uk/modules/universal-micro-keyboard/ This is a good base keyboard based on a Pro-Mini(32u4) or bare DIP ATMEGA328
Matrix Keyboard BOM
1 off RC2014 KEYBOARD PCB
1 off 8 pin RA header
1 off 5 pin RA header
40 off Tactile Switch
8 off 1N4148
[ATMEGA328 Version available]
USB Keyboard BOM
1 off RC2014 KEYBOARD PCB
1 off 24 pin wide socket to Pro Mini adapter
1 off Arduino Pro Mini
1 off 10k Resistor
1 off 100nf capacitor
41 off Tactile Switch
8 off 1N4148
This is a really good 14x5 matrix with a 4-way directional stick with center click. It's based on a 32u4 and takes cues from the D60 project below.
BOM
Components
Component/Label/Quantity
Atmega32u4/~/1
Micro USB Connector/~/1
22OΩ/R1, R2/2
10KΩ/R3/1
330Ω/R4/1
22pF/C1, C2/2
1uF/C3/1
LED/D0/1
1N4148/D1-D70/70
TL3303 Tactile Switch/SW/70
5-way Switch/S1/1
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