4 layers25.5 × 40.7 mm
ATmega32u4 Dev
CafeAsh/DevBoards
Development board based on the ATmega32U4 microcontroller, designed for USB-enabled embedded projects, rapid prototyping, and firmware experimentation.
34 parts
4 layers26.4 × 49.4 mm
RP2040 Dev
CafeAsh/DevBoardsDevelopment board based on the ATmega32U4 microcontroller, designed for USB-enabled embedded projects, rapid prototyping, and firmware experimentation.
- Size
- 26.4 × 49.4 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 40
- Nets
- 60
- Pads
- 211
- Tracks, vias
- 397, 80
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 17 Nov 2025
- Updated
- 19 Aug 2026
Overview
RP2040 Dev is an open-source printed circuit board by CafeAsh, from the CafeAsh/DevBoards repository on GitHub. It is a 4-layer board of 26.4 × 49.4 mm with 40 parts on 60 nets, routed with 397 tracks and 80 vias.
It is built around the RP2040, W25Q128JVSIQ and ABM8G-12.000MHZ-4Y-T3, with the PTVS5V0Z1USKPYL and USB4105-GF-A among its other parts. Its parts include 16 capacitors, 10 resistors, 3 ICs, 3 diodes and 3 connectors. It belongs with the RP2040 boards of this library.
Main components
5
RP2040
LQFN-56(7x7)12bit 133MHz 30 LQFN-56(7x7) Microcontrollers (MCU/MPU/SOC) ROHSRaspberry PiMicrocontrollers (MCU/MPU/SOC)
W25Q128JVSIQ
SOIC-8-208mil-40℃~+85℃ 100,000 cycles 120ms@(32KB) 128Mbit 133MHz 1uA 2.7V~3.6V 20 Years 3ms Power-on reset、Hardware write protection、Software write protection、Write enable latch、Absolute write protection SPI SOIC-8-208mil NOR FLASH ROHSWinbondNOR FLASH
ABM8G-12.000MHZ-4Y-T3
SMD3225-4P-10℃~+60℃ 10pF 120Ω 12MHz Crystal Oscillator ±30ppm ±30ppm SMD3225-4P Crystals ROHSAbraconCrystals
PTVS5V0Z1USKPYL
0603-40℃~+125℃ 12V 200W 200nA 20A 5V 6.4V IEC 61000-4-2、IEC 61000-4-5 TVS Unidirectional 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
40| Qty | Value | Footprint | References |
|---|---|---|---|
| 9 | 0.1u | Capacitor_SMD:C_0402_1005Metric | C5, C6, C7, C8, C9, C10, C13, C15, C16 |
| 3 | 1K | Resistor_SMD:R_0402_1005Metric | R7, R9, R10 |
| 2 | 10u | Capacitor_SMD:C_0402_1005Metric | C3, C11 |
| 2 | 15p | Capacitor_SMD:C_0402_1005Metric | C1, C2 |
| 2 | 1u | Capacitor_SMD:C_0402_1005Metric | C12, C14 |
| 2 | 27.4 | Resistor_SMD:R_0201_0603Metric_Pad0.64x0.40mm_HandSolder | R1, R2 |
| 2 | 5K1 | Resistor_SMD:R_0201_0603Metric_Pad0.64x0.40mm_HandSolder | R5, R6 |
| 2 | Conn_01x18_Pin | Connector_PinHeader_2.54mm:PinHeader_1x18_P2.54mm_Vertical | J2, J3 |
| 2 | LED | LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D2, D3 |
| 2 | SW_Push | Inductor_SMD:L_0805_2012Metric_Pad1.05x1.20mm_HandSolder | SW1, SW2 |
| 1 | 1K | Resistor_SMD:R_0201_0603Metric_Pad0.64x0.40mm_HandSolder | R4 |
| 1 | 22 | Resistor_SMD:R_0201_0603Metric_Pad0.64x0.40mm_HandSolder | R3 |
| 1 | 22u | Capacitor_SMD:C_0402_1005Metric | C4 |
| 1 | ABM8G-12.000MHZ-4Y-T3 | Footprints:XTAL_ABM8G-12.000MHZ-4Y-T3 | Y1 |
| 1 | AMS1117CS-3.3 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U4 |
| 1 | DNF | Resistor_SMD:R_0402_1005Metric | R8 |
| 1 | LOGO | Footprints:6mm Coffee | G*** |
| 1 | PTVS5V0Z1USKP | Diode_SMD:Nexperia_DSN1608-2_1.6x0.8mm | D1 |
| 1 | Polyfuse | Fuse:Fuse_0603_1608Metric | F1 |
| 1 | RP2040 | Package_DFN_QFN:QFN-56-1EP_7x7mm_P0.4mm_EP3.2x3.2mm | U1 |
| 1 | USB4105-GF-A | Footprints:GCT_USB4105-GF-A | J1 |
| 1 | W25Q128JVS | Package_SO:SOIC-8_5.3x5.3mm_P1.27mm | U2 |
Questions
How big is the RP2040 Dev PCB?
It measures 26.4 × 49.4 mm and has 4 copper layers, 1.6 mm thick.
What parts does the RP2040 Dev use?
40 parts, built around the RP2040, W25Q128JVSIQ, ABM8G-12.000MHZ-4Y-T3 and PTVS5V0Z1USKPYL. 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 RP2040 Dev KiCad files?
From the CafeAsh/DevBoards repository on GitHub, at the commit this page was made from: the board is RP2040_Dev/RP2040_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 RP2040 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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