4 layers60 × 80 mm
Portable assetTracker v0.2
ericyuanyong/asset-tracker
a asset tracker demo project based on msom
160 partsMIT
6 layers17.8 × 33.2 mm
Guilty devboard idk
askiiart/guilty-devboard-xrd3A Xiao clone with a ton of GPIO, a focus on extremely low power draw, and which is relatively easy to assemble
- Size
- 17.8 × 33.2 mm
- Copper layers
- 6
- Thickness
- 1.6 mm
- Parts
- 61
- Nets
- 77
- Pads
- 426
- Tracks, vias
- 788, 142
- Pours
- 6
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 15 Jan 2026
- Updated
- 7 Nov 2026
Overview
Guilty devboard idk is an open-source printed circuit board by askiiart, from the askiiart/guilty-devboard-xrd repository on GitHub. It is a 6-layer board of 17.8 × 33.2 mm with 61 parts on 77 nets, routed with 788 tracks and 142 vias.
It is built around the BD83070GWL-E2, FH9261-G3JH and SGM40567-4.2XG/TR, with the TCA9536DGK and SP2038CNQ among its other parts. Its parts include 20 capacitors, 14 resistors, 6 ICs, 6 inductors and 2 diodes. It belongs with the microcontroller boards boards and the nRF52 and nRF5x boards of this library.
Main components
5
BD83070GWL-E2
UFBGA-12-40℃~+85℃ 1 1.5MHz 1A 2.5V、3.3V 2.8uA 2V~5.5V Buck-Boost Buck-Boost Built-in Fixed Yes UFBGA-12 DC-DC Converters ROHSROHM SemiconductorDC-DC Converters
FH9261-G3JH
SOT-23-6-40℃~+85℃ 1 100nA 1V~7.5V 3V 4.28V Protection IC Support SOT-23-6 Battery Management ROHSXIN FEI HONGBattery Management
SGM40567-4.2XG/TR
WLCSP-6-B(0.92x1.16)-40℃~+125℃ 1 2.7V~7.5V 4.2V 700mA WLCSP-6-B(0.92x1.16) Battery Management ROHSSG MicroBattery Management
TCA9536DGK
TSSOP8Remote 4-Bit I2C and SMBus I/O Expander with Configuration RegistersTexas InstrumentsUncategorised
SP2038CNQ
PDFN-6L(2x2)UncategorisedSiliup
README
README.mdGuilty Devboard Xrd
A dev board for my keyboard, because all the other options kinda suck(ed)
- Compatible with both XIAO nRF52840 Plus and nRF54LM20A
- As efficient as possible
- Fast battery charging (configurable ~50-700mA) and over(dis)charge protection
- Up to 5V 3A from USB, and 3.3V 1A (including MCU power draw)
- 27 GPIO pins, nearly as much as the XIAO nRF54LM20A, despite much more limited manufacturing capabilities, while still having an antenna built-in.
See the documentation for more details on what this has over the official XIAOs.
Documentation
Docs are available here (short link)
Note: DRC errors
DRC shows ~140 clearance errors due to the Xiao Plus footprint having pads at and past the edge of the board, a couple things in the keep-out zone, and the QR codes overlapping/being too close to other items. That's intentional, ignore those.
Schematic
Use Kicanvas to see the schematic
Bill of Materials
Notes
- The layer stackup should be JLC0616H-3313, and a stencil with electropolishing is recommended.
- The choice of USB-C connector is odd due to space requirements. If you can find a USB-C connector with the same footprint or smaller - at least in depth - then please tell me.
- Kicad, marbastlib, and nordic-lib-kicad are required for this project.
Parts
61| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 100nF | Capacitor_SMD:C_0201_0603Metric | C2, C8, C9, C21 |
| 4 | 4.7uF | Capacitor_SMD:C_0201_0603Metric | C4, C11, C14, C17 |
| 2 | 2.2uF | Capacitor_SMD:C_0201_0603Metric | C6, C13 |
| 2 | 22uF | Capacitor_SMD:C_0402_1005Metric | C16, C19 |
| 2 | 30 | Resistor_SMD:R_0201_0603Metric | R4, R5 |
| 2 | 5.1k | Resistor_SMD:R_0201_0603Metric | R1, R2 |
| 2 | D | Diode_SMD:D_SOD-882 | D6, D7 |
| 2 | DNP | Capacitor_SMD:C_0201_0603Metric | C3, C7 |
| 2 | FerriteBead | Inductor_SMD:L_0201_0603Metric | FB1, FB2 |
| 1 | 0.1uF | Capacitor_SMD:C_0201_0603Metric | C12 |
| 1 | 0.47uF | Capacitor_SMD:C_0201_0603Metric | C23 |
| 1 | 1.0nH | Inductor_SMD:L_0201_0603Metric | L7 |
| 1 | 1.0pF | Capacitor_SMD:C_0201_0603Metric | C5 |
| 1 | 1.2pF | Capacitor_SMD:C_0201_0603Metric | C18 |
| 1 | 1.5pF | Capacitor_SMD:C_0201_0603Metric | C15 |
| 1 | 1.5uH | Inductor_SMD:L_0603_1608Metric | L3 |
| 1 | 100k | Resistor_SMD:R_0201_0603Metric | R14 |
| 1 | 10k | Resistor_SMD:R_0201_0603Metric | R12 |
| 1 | 10uF | Capacitor_SMD:C_0402_1005Metric | C1 |
| 1 | 1k | Resistor_SMD:R_0201_0603Metric | R7 |
| 1 | 2.2 | Resistor_SMD:R_0201_0603Metric | R16 |
| 1 | 200 | Resistor_SMD:R_0201_0603Metric | R17 |
| 1 | 2M | Resistor_SMD:R_0201_0603Metric | R9 |
| 1 | 2k | Resistor_SMD:R_0201_0603Metric | R6 |
| 1 | 3.3nH | Inductor_SMD:L_0201_0603Metric | L1 |
| 1 | 3.6nH | Inductor_SMD:L_0201_0603Metric | L5 |
| 1 | 32.768kHz | Crystal:Crystal_SMD_1210-4Pin_1.2x1.0mm | Y2 |
| 1 | 32MHz | Crystal:Crystal_SMD_1210-4Pin_1.2x1.0mm | Y1 |
| 1 | 39k | Resistor_SMD:R_0201_0603Metric | R15 |
| 1 | 4.7nH | Inductor_SMD:L_0201_0603Metric | L4 |
| 1 | 4.7uH | Inductor_SMD:L_0402_1005Metric | L6 |
| 1 | 470k | Resistor_SMD:R_0201_0603Metric | R3 |
| 1 | 806k | Resistor_SMD:R_0201_0603Metric | R8 |
| 1 | Antenna_Chip | PCM_marbastlib-various:2450AT18D0100001E_L | AE1 |
| 1 | BD83070GWL-E2 | guilty-devboard-idk:BD83070GWL | U6 |
| 1 | FH9261-G3JH | Package_TO_SOT_SMD:SOT-23-6 | U5 |
| 1 | Jumper_2_Open | Resistor_SMD:R_0603_1608Metric | JP1 |
| 1 | Jumper_2_Small_Bridged | Resistor_SMD:R_0201_0603Metric | JP2 |
| 1 | SGM40567-4.2XG/TR | easyeda2kicad:WLCSP-6_L1.2-W0.9-R3-C2-P0.40-TL | U2 |
| 1 | SP2038CNQ | easyeda2kicad:PDFN-6_L2.0-W2.0-P0.65-BL-EP-1 | Q1 |
| 1 | TCA9536 | guilty-devboard-idk:TCA9536 | U4 |
| 1 | USB_C_Receptacle_USB2.0_16P | Connector_USB:USB_C_Receptacle_Amphenol_124019772112A | J1 |
| 1 | nRF54LM20A-QGAA | PCM_nordic-lib-kicad-nrf54l:QFN-52-1EP_6x6mm_P0.4mm_EP4.7x4.7mm_ThermalVias | U1 |
| 1 | ~ | guilty-devboard-idk:Guilty Devboard Xrd pads | U3 |
The 57 most common of 61 parts.
Questions
How big is the Guilty devboard idk PCB?
It measures 17.8 × 33.2 mm and has 6 copper layers, 1.6 mm thick.
What parts does the Guilty devboard idk use?
61 parts, built around the BD83070GWL-E2, FH9261-G3JH, SGM40567-4.2XG/TR and TCA9536DGK. 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 Guilty devboard idk KiCad files?
From the askiiart/guilty-devboard-xrd repository on GitHub, at the commit this page was made from: the board is PCB/guilty-devboard-idk.kicad_pcb and its schematic PCB/guilty-devboard-idk.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Guilty devboard idk design in my own project?
Its repository states no licence, so its author keeps all rights: ask askiiart before reusing the design.
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