trio

Modular unibody keyboard with two VIK modules.

Caution

This keyboard is designed for minimal vertical spacing (19x16mm). Regular keycaps will not fit, you must print your own - for example my DES MinY.

It's created as a cheap prototype to test VIK abilities and modules - all PCBs are under 100x100mm, one-piece case <0.3kg for cheap JLCPCB shipping.

Build process requires a lot of hand-soldering with 0.5mm pitch, you need good tools and experience to do that.

I do not recommend to build it exactly like that, but to use it as inspiration for your projects. Feel free to use and improve KiCad and Fusion 360 source files.

Features

MinY (19x16mm) spacing
36 KS-33 (Gateron Low Profile) keys with hotswap
central PCB with two independent VIKs, DRV2605L haptic feedback and rotary encoder
periferal PCBs for keys
3D printed case with 1.28" display, Azoteq TPS65 touchpad and 33mm encoder

Photos

Gerber files

Main PCB
Side PCB
Azoteq VIK adapter
Display VIK adapter - 1.28" round version

Case files

v0.1
v0.2 - higher version, should work but untested

Firmware

Companion app for Raw HID communication. Use "productId": 2120 for that keyboard.

QMK

Please see main config.h and rules.mk for comments and available options.

Vial

Bill of materials

PCB
36 KS-33 switches
36 hotswap sockets for KS-33 switches
3D printed case
Azoteq TPS65 touchpad
Azoteq VIK adapter
Bare 1.28" round display - without PCB
Display VIK adapter - 1.28" round version + adapter's BOM
Helios-sized (26 GPIOs) RP2040 MCU
37 SMD SOD-123 1N4148 diodes
Vertical and horizontal 12pin FFC/FPC connectors
12pin 0.5mm pitch 6cm FFC cable - both reverse and forward variants
short EC11 rotary encoder
32mm encoder knob
SMD 4x4x1.5mm push button
4mm M2 screws with flat head
M2 heatset inserts - 3mm length, 3.2mm diameter for resin case or 3.5mm for Nylon/PLA
7x1.5 legs
for haptic feedback:
- DRV2605L motor controller
- 2 1uF capacitors (SMD 1206 size)
- 2 4.7kOhm resistors (SMD 1206 size)
- LRA or ERM motor

Build notes

side PCBs have two keys that have to be broken off and handwired to correct places (diodes stay on the big part)
rotary encoder uses GPIO from VIK2, so Azoteq has to be connected to VIK2 port, and display to VIK1. Make sure to bridge solder jumpers on the back.
cheap ERM motors may not have enough internal resistance, if you motor does not work, try to add 5-10R resistor to it
see photos for FFC connections

Development

For proper KiCad setup install my zzkeeb library

Support

If you like my work and want to support my future designs, please consider sponsorship.

zzeneg / trio