4 layers49.1 × 54.3 mm
Rp2350-hdmi hexpansion
Corteil/rp2350-hdmi-hexpansion
RP2350 HDMI hexpansion for the EMF Tildagon badge -- mirrors the badge's display to a monitor over HSTX/DVI
57 parts2
2 layers20.3 × 30.3 mm
Slickbug
HalFrgrd/slickbugA small SWD programmer using the Seeed Studio XIAO RP2040. I wanted a compact debugger with a tiny target footprint (roughly 4.8mm by 1.1mm).
- Size
- 20.3 × 30.3 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 10
- Nets
- 19
- Pads
- 59
- Tracks, vias
- 67, 11
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 25 Aug 2026
- Updated
- 18 Oct 2026
Overview
Slickbug is an open-source printed circuit board by HalFrgrd, from the HalFrgrd/slickbug repository on GitHub, published under the MIT licence. It is a 2-layer board of 20.3 × 30.3 mm with 10 parts on 19 nets, routed with 67 tracks and 11 vias.
It is built around the MAX40203AUK+T and JK-SMD0805-020-30V. Its parts include 4 ICs, 2 resistors, 2 connectors, 1 capacitor and 1 fuse. It belongs with the interfaces and adapters boards and the RP2040 boards of this library.
Main components
2
MAX40203AUK+T
SOT-23-5-40℃~+125℃ 1.2V~5.5V 200mV 300nA 6V SOT-23-5 ORing Controllers ROHSMaxim Integrated (Analog Devices)Power Distribution Switches
JK-SMD0805-020-30V
0805-40℃~+85℃ 1.2mm 1.5mm 2.2mm 200mA 20ms 30V 4.5Ω 40A 500mA 500mW 500mΩ 0805 Resettable Fuses ROHSJinrui Electronic Materials Co.Resettable Fuses
README
README.mdSlickBug
A small SWD programmer using the Seeed Studio XIAO RP2040. I wanted a compact debugger with a tiny target footprint (roughly 4.8mm by 1.1mm).
It uses four R50 test probe receptacles which are mounted on the back of the PCB and are held in place using two PCB "combs". P50 test probes sit in the R50 receptacles. The GND pin extends 1.5mm further so that GND connects first.
Target footprint
The target footprint is 4 pads with pitch 1.27mm:
 |  |  |
|---|---|---|
| PCB footprint with guiding hole | PCB footprint SMD only | Target footprint next to a MX keyswitch |
Installing the target footprint
A standalone KiCad library containing only the target symbol and footprint is located in hardware/slick_bug_target/
Add it to your KiCad project with:
- Copy
hardware/slick_bug_target/into your project (or add this repo as a submodule). - Register the
Footprint Library: Go toPreferences->Manage Footprint Libraries, click the folder icon, and selecthardware/slick_bug_target/slick_bug_target.pretty - Register the
Symbol Library: Go toPreferences->Manage Symbol Libraries, addhardware/slick_bug_target/slick_bug_target.kicad_sym - Place
slick_bug_target:Conn_SWD_SlickBug_V1in your schematic. It already hasslick_bug_target:SlickBug_Target_V1pre-assigned as its footprint.
Ordering and assembly
Drag the production files to JLCPCB's order page to get the PCBs. 1.6mm thick so that the combs work as intended.
You can get the components from LCSC and combine your order with JLCPCB. I bought the test probes and receptacles from AliExpress.
You will need to snap off the combs from the pcb to hold the R50 receptacles in place.
 |  |
|---|---|
| SlickBug PCB | Partly assembled |
Firmware
SlickBug uses the same SWD GPIO pins (GPIO 2 = SWCLK, GPIO 3 = SWDIO) as a Raspberry Pi Pico, so it runs the unmodified official debugprobe_on_pico.uf2 firmware (also included in firmware/debugprobe_on_pico.uf2):
- Put the XIAO RP2040 into BOOTSEL mode (hold
B, tapR, releaseB). - Copy
firmware/debugprobe_on_pico.uf2onto theRPI-RP2drive.
Parts
10| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 33Ω | PCM_JLCPCB:R_0603 | R1, R2 |
| 2 | ~ | slick_bug:R50_pcb_comb | U2, U3 |
| 1 | 1uF | PCM_JLCPCB:C_0603 | C1 |
| 1 | Conn_01x04_Socket | slick_bug:Harwin_M20-89004xx_1x04_P2.54mm_Horizontal_blank | J2 |
| 1 | Conn_01x04_Socket | slick_bug:R50_horizontal_4pin | J1 |
| 1 | JK-SMD0805-020-30V | slick_bug:F0805 | F1 |
| 1 | MAX40203AUK+T | slick_bug:SOT-23-5_L3.0-W1.6-P0.95-LS2.8-BR | U4 |
| 1 | XIAO-RP2040-SMD | slick_bug:XIAO-RP2040-SMD | U1 |
Questions
How big is the Slickbug PCB?
It measures 20.3 × 30.3 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Slickbug use?
10 parts, built around the MAX40203AUK+T and JK-SMD0805-020-30V. 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 Slickbug KiCad files?
From the HalFrgrd/slickbug repository on GitHub, at the commit this page was made from: the board is hardware/slick_bug.kicad_pcb and its schematic hardware/slick_bug.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Slickbug design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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