2 layers41.2 × 46.6 mm
2 layers42 × 67 mm
Lalboard
JesusFreke/lalboard993A 3D-printed keyboard inspired by the DataHand
- Size
- 42 × 67 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 65
- Nets
- 82
- Pads
- 345
- Tracks, vias
- 624, 65
- Pours
- 5
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 14 Feb 2019
- Updated
- 10 Apr 2025
Overview
Lalboard is an open-source printed circuit board by JesusFreke, from the JesusFreke/lalboard repository on GitHub. It is a 2-layer board of 42 × 67 mm with 65 parts on 82 nets, routed with 624 tracks and 65 vias.
It is built around the RP2040, COS724SR and W25Q128JVSIQ, with the USBLC6-2SC6, XC6220B331MR and DMG2301L-7(ES) among its other parts. Its parts include 18 capacitors, 17 resistors, 9 connectors, 7 ICs and 5 transistors. It belongs with the RP2040 boards of this library.
Main components
8
RP2040
LQFN-56(7x7)12bit 133MHz 30 LQFN-56(7x7) Microcontrollers (MCU/MPU/SOC) ROHSRaspberry PiMicrocontrollers (MCU/MPU/SOC)
COS724SR
SOP-14-1.05V~2.75V -40℃~+125℃ 10MHz 125dB 12nV/√Hz@1kHz 2.1V~5.5V 2.5pA 2.5pA 21mA 2uV/℃ 4 5mV 650uA 7.5V/us Rail-to-Rail Input, Rail-to-Rail Output SOP-14 Operational Amplifier ROHSCOSINEOperational Amplifier
W25Q128JVSIQ
SOIC-8-208mil-40℃~+85℃ 100,000 cycles 120ms@(32KB) 128Mbit 133MHz 1uA 2.7V~3.6V 20 Years 3ms Power-on reset、Hardware write protection、Software write protection、Write enable latch、Absolute write protection SPI SOIC-8-208mil NOR FLASH ROHSWinbondNOR FLASH
USBLC6-2SC6
SOT-23-60.35pF、0.8pF 100nA 150W@8/20us 15V 2 5V 6A@8/20us 6V ESD SOT-23-6 ESD and Surge Protection (TVS/ESD) ROHSUMWESD And Surge Protection (TVS/ESD)
XC6220B331MR
SOT-23-5-40℃~+85℃@(Ta) 1 25uA 3.3V 400mV@(800mA) 5.5V 50dB@(10kHz) 900mA Fixed Over Current Protection、Over Temperature Protection Positive SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTECH PUBLICVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
DMG2301L-7(ES)
SOT-23SOT-23 MOSFETs ROHSElecSuperMOSFETs
CBG201209U500T
08051 150mΩ 50Ω@100MHz 900mA ±25% 0805 Ferrite Beads ROHSGuangdong Fenghua Advanced Tech (FH)Ferrite Beads
TYPE-C-31-M-12
SMD-30℃~+80℃ 1 10,000 cycles 16P 20V 5A 7.35mm Female Surface Mount, Right Angle Type-C SMD USB Connectors ROHSHRO ElectronicsUSB Connectors
README
README.mdlalboard - A 3D-printed keyboard inspired by the DataHand.
Links
Online viewer for cluster assemblies:
Project Details
I am a long-time user of a DataHand keyboard. With the scarcity and rising cost of second hand DataHands these days, I wanted to ensure that I always had access to a DataHand-like keyboard. And so this project was born.
The overall functionality of the lalboard is obviously heavily based on the DataHand, but I designed all of the specific key mechanisms, etc. from scratch, to be printable on a normal hobby-level FDM printer.
With my DataHand, I never felt like I could get the keys positioned quite right for my hand. So one of my primary focuses with the lalboard was adjustability. Each key cluster can be independently adjusted in all 6 degrees of freedom to some extent.
Most parts need to be printed in a very opaque PLA, but there are a few parts that don't work well in PLA which should be printed in polycarbonate or similar material, for its strength and heat resistance.
Key Mechanisms
All keys use a pair of magnets to provide the clickiness and key return force, and an IR LED and phototransistor for detecting a keypress. They are all held in place only with magnets, so they are easily removable for cleaning, etc.
The feel/clickiness of the keys was another focus area. I tried to get them to feel as similar to those on a DataHand as possible. They require roughly the same amount of force, and have that same unique clicky feel due to the magnetic holding force.
Adjustability
The key clusters have a trio of standoffs that are designed to be mounted onto a steel sheet with magnets. Each standoff has an adjustable height, and is mounted to the key cluster via a ball socket. This provides a limited 6 degrees of freedom in adjusting the angle and position of each key cluster, in order to get it perfectly positioned for your hands.
Electronics
This design uses copper traces that are cut from adhesive-backed copper tape using a vinyl cutter, and applied to the bottom of 3D-printed "pcbs" printed with polycarbonate for its excellent heat resistance during soldering. There are currently no designs for actual pcbs, but I don't think it should be difficult to do. If someone wants to tackle that, I'm happy to give pointers or otherwise help in any way I can :)
Each side of the keyboard uses an independent teensy 2.0 board, and are connected with 4 wires between them to enable communication via i2c. Only one side of the keyboard actually needs to be plugged into USB. The teensy's run a modified version of the teensyhand firmware.
Handrest
The handrest was first molded for my wrist in plasticine clay, and then scanned in using the meshroom photogrammetry software. Since they were molded for my wrists specifically, I'm not sure how "one-size-fits-all" they are, or how comfortable they would be for someone else to use.
BOM
Printing tips & instructions
Preparing the Vinyl-cut PCBs
Note: This is not an officially supported Google product.
Parts
65| Qty | Value | Footprint | References |
|---|---|---|---|
| 12 | 100n | Capacitor_SMD:C_0402_1005Metric | C2, C5, C6, C9, C12, C13, C14, C15, C16, C17, C19, C20 |
| 5 | 2k | Resistor_SMD:R_0402_1005Metric_Pad0.72x0.64mm_HandSolder | R9, R10, R11, R12, R13 |
| 5 | Conn_01x07 | lalboard:JST_ZH_B7B-ZR_1x07_P1.50mm_Vertical | J3, J4, J5, J6, J7 |
| 5 | DMG2301L-7 | Package_TO_SOT_SMD:SOT-23 | Q1, Q2, Q3, Q4, Q5 |
| 4 | 5.1k | Resistor_SMD:R_0402_1005Metric | R14, R15, R16, R17 |
| 4 | CBG201209U500T | Inductor_SMD:L_0805_2012Metric | FB1, FB2, FB3, FB4 |
| 2 | 1k | Capacitor_SMD:C_0402_1005Metric | R2, R3 |
| 2 | 1u | Capacitor_SMD:C_0402_1005Metric | C7, C10 |
| 2 | 27 | Capacitor_SMD:C_0402_1005Metric | R5, R6 |
| 2 | 30pF | Capacitor_SMD:C_0402_1005Metric | C8, C11 |
| 2 | COS724 | lalboard:TSSOP-14_4.4x5mm_P0.65mm | U4, U5 |
| 2 | Conn_01x18 | Connector_PinHeader_2.54mm:PinHeader_1x18_P2.54mm_Vertical | J1, J2 |
| 2 | MountingHole_Pad | MountingHole:MountingHole_3.2mm_M3_DIN965_Pad | H1, H2 |
| 2 | TYPE-C-31-M-12 | Connector_USB:USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J8, J9 |
| 2 | USBLC6-2SC6 | Package_TO_SOT_SMD:SOT-23-6 | U6, U7 |
| 1 | 1.5k | Resistor_SMD:R_0402_1005Metric | R1 |
| 1 | 100k | Resistor_SMD:R_0402_1005Metric | R7 |
| 1 | 10k | Resistor_SMD:R_0402_1005Metric | R4 |
| 1 | 10u | Capacitor_SMD:C_0402_1005Metric | C1 |
| 1 | 390k | Resistor_SMD:R_0402_1005Metric | R8 |
| 1 | 4.7u | Capacitor_SMD:C_0402_1005Metric | C4 |
| 1 | Boot | lalboard:SW_TS-1187A-B-A-B | SW2 |
| 1 | Crystal_GND24 | lalboard:OSC_X322516MLB4SI | Y1 |
| 1 | RP2040 | lalboard:RP2040-QFN-56 | U2 |
| 1 | Reset | lalboard:SW_TS-1187A-B-A-B | SW1 |
| 1 | W25Q128JVS | Package_SO:SOIC-8_5.23x5.23mm_P1.27mm | U3 |
| 1 | XC6220B331MR | Package_TO_SOT_SMD:SOT-23-5 | U1 |
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Questions
How big is the Lalboard PCB?
It measures 42 × 67 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Lalboard use?
65 parts, built around the RP2040, COS724SR, W25Q128JVSIQ and USBLC6-2SC6. 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 Lalboard KiCad files?
From the JesusFreke/lalboard repository on GitHub, at the commit this page was made from: the board is kicad/main_board.kicad_pcb and its schematic kicad/cluster.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Lalboard design in my own project?
Its repository states no licence, so its author keeps all rights: ask JesusFreke before reusing the design.