2 layers60 × 30 mm
Controller
google/mozc-devices
Circuit diagrams and firmware source code for Gboard DIY keyboards
11 parts3kApache-2.0
2 layers56.9 × 68.1 mm
Picofan
Mase3206/picofanA Raspberry Pi Pico-based fan controller
- Size
- 56.9 × 68.1 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 11
- Nets
- 37
- Pads
- 122
- Tracks, vias
- 110, 0
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 5 Jan 2024
- Updated
- 25 Jun 2025
Overview
Picofan is an open-source printed circuit board by Mase3206, from the Mase3206/picofan repository on GitHub. It is a 2-layer board of 56.9 × 68.1 mm with 11 parts on 37 nets, routed with 110 tracks and 0 vias.
Its parts include 4 connectors, 3 resistors and 1 IC. It belongs with the RP2040 boards of this library.
README
README.mdpicofan
Picofan is a Raspberry Pi Pico-based fan controller supporting PWM fans, speed measurement, and automatic speed adjustment. A RP2040-based PCB will be published in the future.
Hardware Requirements
Fans
Currenly, only PWM fans are supported due to their ease of digital control. Support for voltage-controlled fans may be implemented in the future.
picofan is fan voltage-agnostic by controlling fan power with individual transistors.
Temperature Sensors
Fan speed can be set to adjust automatically via a default or user-defined curve with feedback from one or more temperature sensors. Only analogue sensors are supported at this time, and they must be connected to a static serial shift register, such as the Texas Instruments CD4021B. The RP2040 has four ADCs, three of which are available to the user on the Pico; one is reserved for the on-board temperature sensor.
Control
picofan can be controlled by a Raspberry Pi 2 or later at the moment, but support for any device with a UART interface is planned. For my development, I am using a Raspberry Pi 3b.
Software
picofan has two software components:
- Pico code, written in MicroPython
- Companion device code, written in standard Python 3
The two devices communicate via a custom protocol over UART0 and use unique addresses to identify the command sender and recipient.
Parts
11| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | R_US | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R1, R2, R3 |
| 3 | Thermistor_NTC | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | TH1, TH2, TH3 |
| 2 | PWM_Fan | Connector:FanPinHeader_1x04_P2.54mm_Vertical | J1, J2 |
| 1 | Companion | Connector_IDC:IDC-Header_2x05_P2.54mm_Vertical | J3 |
| 1 | PiRTC Passthrough | Connector_IDC:IDC-Header_2x03_P2.54mm_Vertical | J4 |
| 1 | RaspberryPi_Pico | Module_RaspberryPi_Pico:RaspberryPi_Pico_Common | U1 |
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Questions
How big is the Picofan PCB?
It measures 56.9 × 68.1 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Picofan use?
11 parts. 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 Picofan KiCad files?
From the Mase3206/picofan repository on GitHub, at the commit this page was made from: the board is hardware/picofan/picofan.kicad_pcb and its schematic hardware/picofan/picofan.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Picofan design in my own project?
Its repository states no licence, so its author keeps all rights: ask Mase3206 before reusing the design.