4 layers26.4 × 49.4 mm
RP2040 Dev
CafeAsh/DevBoards
Development board based on the ATmega32U4 microcontroller, designed for USB-enabled embedded projects, rapid prototyping, and firmware experimentation.
40 parts
4 layers25.5 × 40.7 mm
ATmega32u4 Dev
CafeAsh/DevBoardsDevelopment board based on the ATmega32U4 microcontroller, designed for USB-enabled embedded projects, rapid prototyping, and firmware experimentation.
- Size
- 25.5 × 40.7 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 34
- Nets
- 47
- Pads
- 158
- Tracks, vias
- 307, 63
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 17 Nov 2025
- Updated
- 19 Aug 2026
Overview
ATmega32u4 Dev is an open-source printed circuit board by CafeAsh, from the CafeAsh/DevBoards repository on GitHub. It is a 4-layer board of 25.5 × 40.7 mm with 34 parts on 47 nets, routed with 307 tracks and 63 vias.
It is built around the ATMEGA32U4-AU, USBLC6-2SC6 and 0805L050WR, with the ABM8-16.000MHZ-10-1-U-T, HI0805Q310R-10 and PTVS5V0Z1USKYL among its other parts. Its parts include 12 capacitors, 8 resistors, 4 connectors, 3 diodes and 2 ICs. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
7
ATMEGA32U4-AU
QFP-44(10x10)-40℃~+85℃ 10bit 16MHz 1KB 2.5KB 2.7V~5.5V 26 32KB 8 Bit AVR Built-in FLASH QFP-44(10x10) Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
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)
0805L050WR
0805-40℃~+85℃ 1.25mm 1.5mm 100A 100ms 150mΩ 1A 2.2mm 500mA 500mW 6V 850mΩ 0805 Resettable Fuses ROHSLittelfuseResettable Fuses
ABM8-16.000MHZ-10-1-U-T
SMD3225-4P-10℃~+60℃ 10pF 16MHz 70Ω ±10ppm ±10ppm SMD3225-4P Crystals ROHSAbraconCrystals
HI0805Q310R-10
08051 25mΩ 31Ω@100MHz 0805 Ferrite Beads ROHSLairdFerrite Beads
PTVS5V0Z1USKYL
06031.2nF 18V 200W 20A 25nA 5V 6.4V TVS 0603 ESD and Surge Protection (TVS/ESD) ROHSNexperiaESD And Surge Protection (TVS/ESD)
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
ATmega32u4_Dev/README.mdATmega32U4 Development Board
Development board based on the ATmega32U4 microcontroller, designed for USB-enabled embedded projects, rapid prototyping, and firmware experimentation.
Overview
This project provides a hardware platform built around the ATmega32U4, a microcontroller with native USB support.
Ideal use cases include:
- USB HID devices (keyboards, mice, gamepads)
- Serial communication over USB (CDC)
- Custom USB devices
- General embedded applications
Features
- ATmega32U4 microcontroller
- Native USB support (no external USB-to-UART chip required)
- On-board 5V voltage regulation
- Power and Dataline surge protection
- ISP programming header
- Power Status LED
- Programable on board LED (Pin 13)
- GPIO breakout pins
- 16MHz Crystal Oscillator
- Designed to fit standard breadboards
Microcontroller Details
- Core: AVR 8-bit
- Flash Memory: 32 KB
- SRAM: 2.5 KB
- EEPROM: 1 KB
- Clock Speed: 16 MHz
- Interfaces:
- USB 2.0 Full Speed
- UART
- SPI
- I2C (TWI)
Pinout
Pinout leaves some to be desired. Future re-works will better address pin layout
Parts
34| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 0.1u | Capacitor_SMD:C_0402_1005Metric | C3, C4, C5, C6, C10, C11, C12, C13 |
| 2 | 10K | Resistor_SMD:R_0402_1005Metric | R5, R6 |
| 2 | 1K | Resistor_SMD:R_0402_1005Metric | R7, R8 |
| 2 | 22 | Resistor_SMD:R_0402_1005Metric | R3, R4 |
| 2 | 22p | Capacitor_SMD:C_0402_1005Metric | C8, C9 |
| 2 | 5.1k | Resistor_SMD:R_0402_1005Metric | R1, R2 |
| 2 | Conn_01x14_Pin | Connectors:01x14 Header (2.54 Pitch) | J3, J4 |
| 2 | YY0603RE-RN2S1-T2AR4 | LED_SMD:LED_0603_1608Metric | D1, D3 |
| 1 | 0805L050WR | Fuse:Fuse_0805_2012Metric_Pad1.15x1.40mm_HandSolder | F1 |
| 1 | 1825910-6 | CustomFootPrint:Generic SW 3x4mm | SW1 |
| 1 | 1u | Capacitor_SMD:C_0402_1005Metric | C7 |
| 1 | 4.7u | Capacitor_SMD:C_0402_1005Metric | C1 |
| 1 | ABM8-16.000MHZ-10-1-U-T | Footprints:XTAL_ABM8-16.000MHZ-10-1-U-T | Y1 |
| 1 | ATmega32U4-A | Footprints:QFP80P1200X1200X120-44N | U1 |
| 1 | HI0805Q310R-10 | Inductor_SMD:L_0805_2012Metric_Pad1.05x1.20mm_HandSolder | FB1 |
| 1 | ICSP HEader 2x3 | Connectors:02x03 Header | J2 |
| 1 | LOGO | Footprints:PlaceHolder_Logo | G*** |
| 1 | PTVS5V0Z1USKYL | Diode_SMD:Nexperia_DSN1608-2_1.6x0.8mm | D2 |
| 1 | USB4105-GF-A | Footprints:GCT_USB4105-GF-A | J1 |
| 1 | USBLC6-2SC6 | Package_TO_SOT_SMD:SOT-23-6 | U2 |
Questions
How big is the ATmega32u4 Dev PCB?
It measures 25.5 × 40.7 mm and has 4 copper layers, 1.6 mm thick.
What parts does the ATmega32u4 Dev use?
34 parts, built around the ATMEGA32U4-AU, USBLC6-2SC6, 0805L050WR and ABM8-16.000MHZ-10-1-U-T. 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 ATmega32u4 Dev KiCad files?
From the CafeAsh/DevBoards repository on GitHub, at the commit this page was made from: the board is ATmega32u4_Dev/ATmega32u4_Dev.kicad_pcb and its schematic ATiny1616_Dev/ATiny1616_Dev.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the ATmega32u4 Dev design in my own project?
Its repository states no licence, so its author keeps all rights: ask CafeAsh before reusing the design.
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