4 layers401.2 × 151.5 mm
2 layers26 × 44 mm
there is NO CASE for this project, as I am trying to keep this as small as I physically can (I also have no idea how much deflection there is on the switch and some other physical characteristics, so I wouldn't be able…
- Size
- 26 × 44 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 8
- Nets
- 27
- Pads
- 55
- Tracks, vias
- 50, 12
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 12 Jun 2025
- Updated
- 6 Aug 2025
Overview
Knob is an open-source printed circuit board by JustAGlitchFL, from the JustAGlitchFL/Knob repository on GitHub. It is a 2-layer board of 26 × 44 mm with 8 parts on 27 nets, routed with 50 tracks and 12 vias.
It is built around the SK6812MINI-E and RKJXT1F42001. Its parts include 6 diodes, 1 IC and 1 switch. It belongs with the RP2040 boards of this library.
Main components
2
SK6812MINI-E
SMD-40℃~+85℃ 0.6mA 1.78mm 120mcd~240mcd 120° 160mcd~320mcd 1kHz 2.8mm 2000V 3.2mm 3.7V~5.5V 460nm~470nm 515nm~525nm 620nm~625nm 800Kbit/s 815mcd~1275mcd Semi-transparent lens SMD RGB LEDs(Built-in IC) ROHSOPSCO OptoelectronicsRGB LEDs(Built-In IC)
RKJXT1F42001
插件插件 Multi-Directional Switches ROHSALPSALPINEMulti-Directional Switches
README
README.mdKnob
A multifunctional directional controller
Why?
This was inspired by both the BMW iDrive controller, and the Garmin G1000NXI avionics suite RANGE knob. The commonality between these two control interfaces is a multidirectional switch that has inputs for up, down, left, right, push, rotate ccw, and rotate cw. In the iDrive system, directional pushes move between radial menus, rotate moves between options in the menu, and push selects. This allows for intuitive control while keeping your attention focused on the road, rather than trying to poke touchscreen buttons. On the G1000NXI that I flew with at ERAU, the RANGE knob is used to zoom the map around your aircraft with rotation, panning the map, or clicking it to switch to cursor mode. In both of these situations, it has served an interesting role that no other input type could easily replace, and I thought it would be interesting to make it work on a computer.
Assembly:
Just solder everything as shown in the KiCad Project, nothing special.
there is NO CASE for this project, as I am trying to keep this as small as I physically can (I also have no idea how much deflection there is on the switch and some other physical characteristics, so I wouldn't be able to a make a very good one as is)
Pics
BOM
| Q | Name | Link | Price+ship | Total |
|---|---|---|---|---|
| 1 | Knob PCB | $8.22 | $30.96 | |
| 1 | Alps RKJXT1F42001 | https://www.digikey.com/en/products/detail/alps-alpine/RKJXT1F42001/19529127 | $22.74 | |
| 6 | SK6812MINI-E | on hand | ||
| 1 | XIAO RP2040 | https://www.digikey.com/en/products/detail/seeed-technology-co-ltd/102010428/14672129 | included in the other to account for shipping |
Parts
8| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | SK6812MINI | cheyao macropad main PCB-third_party_neopixel.petty:SK6812MINI-E | D1, D2, D3, D4, D5, D6 |
| 1 | RKJXT1F42001 | KiCad:RKJXT1F42001 | S1 |
| 1 | XIAO-RP2040-SMD | Seeed Studio XIAO Series Library:XIAO-RP2040-SMD | U1 |
Questions
How big is the Knob PCB?
It measures 26 × 44 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Knob use?
8 parts, built around the SK6812MINI-E and RKJXT1F42001. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Knob KiCad files?
From the JustAGlitchFL/Knob repository on GitHub, at the commit this page was made from: the board is knob/knob.kicad_pcb and its schematic knob/knob.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Knob design in my own project?
Its repository states no licence, so its author keeps all rights: ask JustAGlitchFL before reusing the design.
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