4 layers198.4 × 104.3 mm
DC33
Maritime-Hacking-Village/Badge-2025
Public repository for the official MHV 2025 badge.
200 parts15CERN-OHL-W-2.0
4 layers64.8 × 18 mm
Corncob
aswild/corncobCorncob is an adapter to run standard 12V PWM computer fans off of a USB power source. It boosts 5V or 9V USB-PD power to 12V and outputs a PWM control signal.
- Size
- 64.8 × 18 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 51
- Nets
- 43
- Pads
- 174
- Tracks, vias
- 263, 86
- Pours
- 9
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 22 Feb 2025
- Updated
- 19 Jul 2026
Overview
Corncob is an open-source printed circuit board by aswild, from the aswild/corncob repository on GitHub. It is a 4-layer board of 64.8 × 18 mm with 51 parts on 43 nets, routed with 263 tracks and 86 vias.
It is built around the STM32C011F6U6, TPS22810TDBVRQ1 and TPS61089, with the ESDA25W, EAST1616RGBB2 and USB4105-GF-A among its other parts. Its parts include 17 resistors, 15 capacitors, 4 ICs, 3 connectors and 2 diodes. It belongs with the STM32 boards of this library.
Main components
6
STM32C011F6U6
UFQFPN-20(3x3)-40℃~+85℃ 12bit 18 2V~3.6V 32 Bit 32KB 48MHz 6KB ARM Cortex-M0+ Built-in+External FLASH UFQFPN-20(3x3) Microcontrollers (MCU/MPU/SOC) ROHSSTMicroelectronicsMicrocontrollers (MCU/MPU/SOC)
TPS22810TDBVRQ1
SOT-23-6-40℃~+105℃ 1 2.7V~18V 2A 79mΩ Active High Load Switch Undervoltage Protection(UVP)、Over Temperature Protection SOT-23-6 Power Distribution Switches ROHSTexas InstrumentsPower Distribution Switches
TPS61089
UncategorisedTexas Instruments
ESDA25W
SOT-323-3L-40℃~+125℃ 15A 1uA 2 24V 25V 25V 400W 65pF ESD IEC 61000-4-2 Unidirectional SOT-323-3L ESD and Surge Protection (TVS/ESD) ROHSSTMicroelectronicsESD And Surge Protection (TVS/ESD)EAST1616RGBB2
SMD-4P,1.6x1.6mm120° Common Anode White Lens SMD-4P,1.6x1.6mm RGB LEDs ROHSEverlight ElectronicsRGB LEDs
USB4105-GF-A
SMD-40℃~+85℃ 1 12P 48V 5A Black Female Surface Mount, Right Angle Type-C USB 2.0 SMD USB Connectors ROHSGlobal Connector Technology (GCT)USB Connectors
README
README.mdCorncob
Corncob is an adapter to run standard 12V PWM computer fans off of a USB power source. It boosts 5V or 9V USB-PD power to 12V and outputs a PWM control signal. The name "Corncob" is because this board sits between 2 cables, like an ear of corn between holders.
Key Hardware
This project is based around:
- STUSB4500 USB-PD sink controller
- STM32C011F4U6 microcontroller - the cheapest STM32 on DigiKey!
- TI TPS61089 synchronous boost converter
- Firmware based on Embassy
License
Copyright 2025 Allen Wild
PCB schematic and design is released under the Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0). Firmware source will (probably) be GPLv3.
Parts
51| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | 100nF | Capacitor_SMD:C_0402_1005Metric | C3, C4, C10, C11, C13 |
| 5 | 5.1k | Resistor_SMD:R_0402_1005Metric | R6, R7, R11, R12, R13 |
| 3 | 118k | Resistor_SMD:R_0402_1005Metric | R5, R14, R15 |
| 3 | 22uF | Capacitor_SMD:C_1206_3216Metric | C7, C8, C9 |
| 2 | 191k | Resistor_SMD:R_0402_1005Metric | R2, R16 |
| 2 | 44.2k | Resistor_SMD:R_0402_1005Metric | R3, R17 |
| 2 | 47uF | Capacitor_SMD:C_1206_3216Metric | C1, C2 |
| 2 | 51R | Resistor_SMD:R_0402_1005Metric | R9, R10 |
| 2 | ESDA25W | Package_TO_SOT_SMD:SOT-323_SC-70 | D1, D2 |
| 2 | PTS647SM38SMTR2 LFS | Wild:SW_SPST_PTS647_Sx38_HandSolder | SW1, SW2 |
| 1 | 1.05M | Resistor_SMD:R_0402_1005Metric | R4 |
| 1 | 10uF | Capacitor_SMD:C_0805_2012Metric | C12 |
| 1 | 10uF | Capacitor_SMD:C_0603_1608Metric | C5 |
| 1 | 12V | TestPoint:TestPoint_Pad_D1.0mm | TP3 |
| 1 | 130R | Resistor_SMD:R_0402_1005Metric | R8 |
| 1 | 180pF | Capacitor_SMD:C_0402_1005Metric | C6 |
| 1 | 1uF | Capacitor_SMD:C_0402_1005Metric | C15 |
| 1 | 4.7uF | Capacitor_SMD:C_0402_1005Metric | C16 |
| 1 | 680nH | Wild:L_Panasonic_ETQP3M-KVP | L1 |
| 1 | 90.9k | Resistor_SMD:R_0402_1005Metric | R1 |
| 1 | EAST1616RGBB2 | Wild:LED_Everlight_EAST1616RGBB2 | LD1 |
| 1 | Fan Output | Wild:PinHeader_KF2510-3+1P_1x04_P2.54mm_Horizontal | J2 |
| 1 | GND | TestPoint:TestPoint_Pad_D1.0mm | TP1 |
| 1 | LOGO | corncob:corn-sticker | G*** |
| 1 | PWM | TestPoint:TestPoint_Pad_D1.0mm | TP4 |
| 1 | STM32C011F6U6 | Package_DFN_QFN:ST_UFQFPN-20_3x3mm_P0.5mm | U2 |
| 1 | TPS22810TDBVRQ1 | Package_TO_SOT_SMD:SOT-23-6 | U3 |
| 1 | TPS61089 | Package_DFN_QFN:Texas_VQFN-RNR0011A-11 | U1 |
| 1 | TPS7B6933DBVR | Package_TO_SOT_SMD:SOT-23-5 | U4 |
| 1 | TagConnect_TC2030-NL | Wild:Paw-Connect_RevA_TC2030-IDC-NL_2x03_P1.27mm_Vertical | J3 |
| 1 | USB4105-GF-A | Connector_USB:USB_C_Receptacle_GCT_USB4105-xx-A_16P_TopMnt_Horizontal | J1 |
| 1 | VBUS | TestPoint:TestPoint_Pad_D1.0mm | TP2 |
The 50 most common of 51 parts.
Questions
How big is the Corncob PCB?
It measures 64.8 × 18 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Corncob use?
51 parts, built around the STM32C011F6U6, TPS22810TDBVRQ1, TPS61089 and ESDA25W. 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 Corncob KiCad files?
From the aswild/corncob repository on GitHub, at the commit this page was made from: the board is pcb/corncob.kicad_pcb and its schematic pcb/corncob.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Corncob design in my own project?
Its repository states no licence, so its author keeps all rights: ask aswild before reusing the design.
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