2 layers278.9 × 138.4 mm
TrueStrike56
byungyoonc/TrueStrike56
TrueStrike56 is a columnar staggered unibody split hall effect keyboard with popular 4x6_4 layout.
211 parts3MIT
2 layers273.8 × 109 mm
TrueStrike42
byungyoonc/TrueStrike4224TrueStrike42 is a columnar staggered unibody split keyboard designed to maximize performance and minimize finger fatigue.
- Size
- 273.8 × 109 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 167
- Nets
- 115
- Pads
- 686
- Tracks, vias
- 2,021, 327
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 16 Jun 2024
- Updated
- 30 Jul 2026
Overview
TrueStrike42 is an open-source printed circuit board by byungyoonc, from the byungyoonc/TrueStrike42 repository on GitHub. It is a 2-layer board of 273.8 × 109 mm with 167 parts on 115 nets, routed with 2,021 tracks and 327 vias.
It is built around the 74AHCT125D, SLSS49E-3 and 74HC4051, with the SK6812MINI-E among its other parts. Its parts include 58 capacitors, 42 diodes, 42 switches and 10 ICs. It belongs with the keyboards and input boards and the AVR (ATmega, ATtiny) boards of this library.
Main components
4
74AHCT125D
SOP-14-40℃~+125℃ 1 4 4.3ns@5V,50pF 4.5V~5.5V 40uA 74AHCT 8mA 8mA Schmitt trigger Tri-State Unidirectional SOP-14 Buffers, Drivers, Receivers, Transceivers ROHSNexperiaBuffer/Driver/Transceiver
SLSS49E-3
SOT-23-40℃~+150℃ 1.5mA 3V~12V 5mA Built-in Schmitt trigger Omnipolar SOT-23 Linear Hall Sensors ROHSSlkorHall Switches
74HC4051
SOP-16-40℃~+85℃ 1 170MHz 28ns 29ns 3V~9V 5ns 5pF 80Ω 8:1 SOP-16 Analog Switches, Multiplexers ROHSWuxi I-core ElecAnalog Switches, Multiplexers
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)
README
README.mdTrueStrike42
TrueStrike42 is a columnar staggered unibody split Hall-effect keyboard designed to maximize performance1 and minimize finger fatigue.
Layout
How to build
Refer to the build guide for detailed instructions.
Firmware
[!WARNING] MCU will behave very erratic (e.g. sending random keypresses rapidly) right after flashing the firmware, before soldering all the components on the board. This is because MCU's analogue pins are connected to nothing, resulting in noise sensor values.
Disconnect the MCU from the PC as soon as possible after the successful firmware flash to prevent chaos.
Use Precompiled Binary
Flash fw/truestrike42_via.uf2 to your RP2040 microcontroller in bootloader mode.
Build on Your Own
Option A
Copy the fw/truestrike42 folder into your cloned QMK Firmware repository's keyboards folder, then run qmk compile -kb truestrike42 -km via.
Option B
The branches above are from my fork of the QMK Firmware/Userspace repository which supports firmware compilation for TrueStrike42.
Follow this guide for External QMK Userspace to build it yourself.
Using VIA HE Configurations
You can access the following tools in VIA by selecting HE TOOLS in the menu next to LIGHTING.
Load VIA Definition
Open fw/truestrike42.json in VIA's DESIGN tab to enable VIA support for TrueStrike42.
Calibrations
Make sure to run the calibration at least once before using the keyboard!
Bottoming Calibration
Calibrates Hall-effect sensor values for each switch when it is fully bottomed out.
Toggle on, fully bottom out each switch, then toggle off.
Noise Floor Calibration
Calibrates the ambient magnetic flux fluctuation detected by the Hall-effect sensors.
Click once while leaving the keyboard untouched for a brief period. The firmware samples the noise baseline.
Show Calibration Data
Prints out current calibration data to the debug console.
Clear Bottoming Calibration Data
Resets Bottoming Calibration Data to prepare for recalibration. Use this when replacing your Hall-effect switches.
Actuation
Mode
Choose between APC and Rapid Trigger.
APC works like a traditional digital switch, but you can change where actuation/release occurs.
Rapid Trigger tracks the switch's height to determine whether the key is being pressed down or released.
Offsets
Sets the offset values for the selected Mode.
The value ranges from 1 (Topmost) to 255 (Bottommost).
Related Projects
- Cipulot's EC Boards
- TrueStrike42's QMK firmware code for analog signal processing was heavily based on the code for the Cipulot's EC boards.
- Boardloaf HE
- 36 key HE split keyboard project by Hanthebot. Their schematics design was derived from TrueStrike42.
Copyright Notice
True-Strike-icon.kicad_mod was created by modifying an icon image for True Strike in the game Baldur's Gate 3, a game by Larian Studios. I used it in accordance with the Larian Fan Content Policy.
Footnotes
-
specifically on rhythm games ↩
Parts
167| Qty | Value | Footprint | References |
|---|---|---|---|
| 58 | 1uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1, C2, C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C20, C21, C22, C23 +42 |
| 40 | SLSS49E | project-specific-library:HE-Switch-1U | S1, S2, S10, S11, S12, S13, S14, S15, S16, S17, S18, S19, S20, S21, S22, S23 +24 |
| 24 | SK6812MINI-E | project-specific-library:SK6812MINI-E_nusumi | D1, D2, D3, D13, D14, D15, D16, D17, D18, D25, D26, D27, D28, D29, D30, D37 +8 |
| 18 | SK6812MINI-E | project-specific-library:SK6812MINI-E_nusumi_Rotated | D7, D10, D11, D12, D19, D20, D21, D22, D23, D24, D31, D32, D33, D34, D35, D36 +2 |
| 7 | 74HC4051 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U2, U3, U4, U5, U6, U7, U8 |
| 2 | SLSS49E | project-specific-library:HE-Switch-2U | S39, S40 |
| 1 | 4053 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U10 |
| 1 | 74AHCT125 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U9 |
| 1 | LOGO | project-specific-library:True-Strike-icon | G*** |
| 1 | ProMicro | promicro:ProMicro | U1 |
| 1 | SSD1306 | SSD1306:128x64OLED | Brd1 |
| 1 | SW_Push | Button_Switch_SMD:SW_Tactile_SPST_NO_Straight_CK_PTS636Sx25SMTRLFS | RESET |
The 155 most common of 167 parts.
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Questions
How big is the TrueStrike42 PCB?
It measures 273.8 × 109 mm and has 2 copper layers, 1.6 mm thick.
What parts does the TrueStrike42 use?
167 parts, built around the 74AHCT125D, SLSS49E-3, 74HC4051 and SK6812MINI-E. 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 TrueStrike42 KiCad files?
From the byungyoonc/TrueStrike42 repository on GitHub, at the commit this page was made from: the board is hw/pcb/TrueStrike42.kicad_pcb and its schematic hw/bottom-plate/TrueStrike42-bottom-plate.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the TrueStrike42 design in my own project?
Its repository states no licence, so its author keeps all rights: ask byungyoonc before reusing the design.