4 layers57 × 27 mm
Altlog
alexdortiz/flight-data-recorder
4-layer flight data recorder. Open altlog.kicadpro in KiCad 10.
47 partsMIT
4 layers23.8 × 44.3 mm
Devboard
EwoudVV/devboard3A small STM32 devboard for deving
- Size
- 23.8 × 44.3 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 41
- Nets
- 47
- Pads
- 214
- Tracks, vias
- 960, 103
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 14 Sep 2026
- Updated
- 10 Oct 2026
Overview
Devboard is an open-source printed circuit board by EwoudVV, from the EwoudVV/devboard repository on GitHub. It is a 4-layer board of 23.8 × 44.3 mm with 41 parts on 47 nets, routed with 960 tracks and 103 vias.
It is built around the STM32F411CEU6, AP2112K-3.3 and USBLC6-2SC6. Its parts include 15 capacitors, 12 resistors, 6 connectors, 3 switches and 2 ICs. It belongs with the microcontroller boards boards and the STM32 boards of this library.
Main components
3
STM32F411CEU6
UFQFPN-48(7x7)-40℃~+85℃ 1.7V~3.6V 100MHz 128KB 12bit 32 Bit 36 512KB ARM Cortex-M4 Built-in FLASH UFQFPN-48(7x7) Microcontrollers (MCU/MPU/SOC) ROHSSTMicroelectronicsMicrocontrollers (MCU/MPU/SOC)
AP2112K-3.3
SOT253.3V 600mA CMOS Low Dropout Linear Regulator with EnableDiodes IncorporatedUncategorised
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)
README
README.mdDevboard
A small STM32 devboard for deving
details
- Compatible with a breadboard
- USB-C programming port
- SD card holder
- 32 header pins total: 22 GPIO, including 9 analog inputs, plus debug and power pins
- STM32 MCU
- 4 layer board
- 24x44mm board size
- 2 side component assembly
images
The board in PCB editor: 
The board in 3d viewer: 
goal
- Purpose: a functional and useful devboard
- MCU: STM32 (MCU_ST_STM32F4:STM32F411CEUx)
- Features: USB-C + UART, SD card, expanded GPIO
- Size: as small as possible
status
project finished!! Once I get funding, I will order 10 assembled PCBs from PCBway.
bom
Parts from the PCBWay BOM, with quantities for one board. The KiCad CSV export is also available.
| Reference | Qty | Manufacturer | Part number | Package |
|---|---|---|---|---|
| C1, C2 | 2 | Murata | GRM1555C1H180JA01D | 0402 |
| C3, C6, C7, C8, C9, C11, C15 | 7 | Samsung | CL05B104KB5NNNC | 0402 |
| C5, C13 | 2 | Samsung | CL05A105KO5NNNC | 0402 |
| C4, C14 | 2 | Samsung | CL05A106KP5NNNC | 0402 |
| C10 | 1 | Murata | GRM155R61A475MEAA | 0402 |
| C12 | 1 | Murata | GRM155R61A225KE95D | 0402 |
| R3, R4 | 2 | Yageo | RC0402FR-075K1L | 0402 |
| R9, R10, R11, R12, R13 | 5 | Yageo | RC0402FR-0747KL | 0402 |
| R8 | 1 | Yageo | RC0402FR-0710RL | 0402 |
| R1, R2, R6 | 3 | Yageo | RC0402FR-0710KL | 0402 |
| R5 | 1 | Yageo | RC0402FR-071KL | 0402 |
| U1 | 1 | STMicroelectronics | STM32F411CEU6 | QFN-48 7x7 |
| U2 | 1 | Diodes Incorporated | AP2112K-3.3TRG1 | SOT-23-5 |
| D1 | 1 | STMicroelectronics | USBLC6-2SC6 | SOT-23-6 |
| LED1 | 1 | Lite-On | LTST-C190GKT | 0603 |
| Y1 | 1 | Abracon | ABM3-25.000MHZ-D2Y-T | 5.0x3.2mm |
| J1 | 1 | GCT | USB4105-GF-A | USB-C 16P |
| J2 | 1 | Hirose | DM3AT-SF-PEJM5 | microSD |
| SW1, SW2, SW3 | 3 | C&K | PTS645SM43SMTR92 LFS | 6x6mm SMD |
The four through-hole headers are soldered separately and are not included in this BOM. For J1, check the USB4105 pin-length variant against the footprint, as noted in the PCBWay BOM.
repo structure
devboard.kicad_pro/.kicad_sch/.kicad_pcb: KiCad project (root)journal.md: devlog journalsREADME.md: this fileproduction: production files, like gerbers, bom, cpldocs/pinout.md: header pinout and on-board connectionsfirmware: starter LED, button, and USB serial firmware
getting started
Building and flashing the starter firmware
Designed by EVV Made for Hack Club Half Life 9/16/26
Parts
41| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | 100n | Capacitor_SMD:C_0402_1005Metric | C3, C6, C7, C8, C9, C11, C15 |
| 5 | 47k | Resistor_SMD:R_0402_1005Metric | R9, R10, R11, R12, R13 |
| 3 | 10k | Resistor_SMD:R_0402_1005Metric | R1, R2, R6 |
| 2 | 10u | Capacitor_SMD:C_0402_1005Metric | C4, C14 |
| 2 | 18p | Capacitor_SMD:C_0402_1005Metric | C1, C2 |
| 2 | 1u | Capacitor_SMD:C_0402_1005Metric | C5, C13 |
| 2 | 5k1 | Resistor_SMD:R_0402_1005Metric | R3, R4 |
| 1 | 10R | Resistor_SMD:R_0402_1005Metric | R8 |
| 1 | 1k | Resistor_SMD:R_0402_1005Metric | R5 |
| 1 | 25MHz | Crystal:Crystal_SMD_Abracon_ABM3-2Pin_5.0x3.2mm | Y1 |
| 1 | 2u2 | Capacitor_SMD:C_0402_1005Metric | C12 |
| 1 | 4u7 | Capacitor_SMD:C_0402_1005Metric | C10 |
| 1 | AP2112K-3.3 | Package_TO_SOT_SMD:SOT-23-5 | U2 |
| 1 | BOOT0 | Button_Switch_SMD:SW_SPST_PTS645Sx43SMTR92 | SW2 |
| 1 | DBG-PWR | Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical | J7 |
| 1 | GPIO-A | Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical | J4 |
| 1 | GPIO-B | Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical | J5 |
| 1 | GPIO-C | Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical | J6 |
| 1 | GREEN | LED_SMD:LED_0603_1608Metric | LED1 |
| 1 | RESET | Button_Switch_SMD:SW_SPST_PTS645Sx43SMTR92 | SW1 |
| 1 | STM32F411CEU6 | Package_DFN_QFN:QFN-48-1EP_7x7mm_P0.5mm_EP5.15x5.15mm | U1 |
| 1 | USB-C | Connector_USB:USB_C_Receptacle_GCT_USB4105-xx-A_16P_TopMnt_Horizontal | J1 |
| 1 | USBLC6-2SC6 | Package_TO_SOT_SMD:SOT-23-6 | D1 |
| 1 | USER | Button_Switch_SMD:SW_SPST_PTS645Sx43SMTR92 | SW3 |
| 1 | microSD | Connector_Card:microSD_HC_Hirose_DM3AT-SF-PEJM5 | J2 |
Questions
How big is the Devboard PCB?
It measures 23.8 × 44.3 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Devboard use?
41 parts, built around the STM32F411CEU6, AP2112K-3.3 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 Devboard KiCad files?
From the EwoudVV/devboard repository on GitHub, at the commit this page was made from: the board is devboard.kicad_pcb and its schematic devboard.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Devboard design in my own project?
Its repository states no licence, so its author keeps all rights: ask EwoudVV before reusing the design.
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