2 layers89 × 50 mm
Business Card
HarbinRepairs/Business-Card-PCB-Black_No-Revision-Number_1.1
Documentation for the Black PCB Business card that has no revision number on the silkscreen. Rev1.1
45 parts1LGPL-3.0
2 layers67.5 × 49 mm
Micro Uno
UgurCelikcan/Micro-Uno1 board with pro micro and uno
- Size
- 67.5 × 49 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 33
- Nets
- 67
- Pads
- 206
- Tracks, vias
- 656, 123
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 20 Aug 2026
- Updated
- 14 Sep 2026
Overview
Micro Uno is an open-source printed circuit board by UgurCelikcan, from the UgurCelikcan/Micro-Uno repository on GitHub, published under the MIT licence. It is a 2-layer board of 67.5 × 49 mm with 33 parts on 67 nets, routed with 656 tracks and 123 vias.
It is built around the ATMEGA328P-AU and ATMEGA32U4-AU. Its parts include 12 capacitors, 9 resistors, 6 connectors, 2 ICs and 2 crystals. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
2
ATMEGA328P-AU
TQFP-32(7x7)-40℃~+85℃ 1.8V~5.5V 10bit 1KB 20MHz 23 2KB 32KB 8 Bit AVR Built-in FLASH TQFP-32(7x7) Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
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)
README
README.mdMicro-Uno MRK.1
A powerful, custom dual-microcontroller development board that combines the USB connectivity and compact form factor of the Pro Micro (ATmega32U4) with the classic pinout and versatility of the Arduino Uno (ATmega328P).
🚀 Key Features
- Dual Microcontroller Architecture:
- Core 1: ATmega32U4 (
U1) with native USB Type-C support, hardware serial, and HID capabilities. - Core 2: ATmega32P (
U2) running with an external 16MHz crystal oscillator, providing classic Uno-compatible GPIO and analog channels.
- Core 1: ATmega32U4 (
- Power & USB Interface:
- USB Type-C receptacle (
J1) with CC1/CC2 pull-down resistors and a resettable PTC polyfuse (F1). - Comprehensive decoupling capacitance (
C1-C12) ensuring stable power rails and clean clock signals.
- USB Type-C receptacle (
- Expansion & Connectivity:
- Dedicated ICSP headers (
J2,J3) for direct programming of both microcontrollers. - Multi-pin breakout headers (
J4,J5,J6) exposing full Port expansions (PORTC,PORTD,PORTF) for rapid prototyping.
- Dedicated ICSP headers (
📊 Schematic Overview
The schematic integrates both processor cores alongside robust power filtering and extensive pin breakout headers on a single A4 sheet.
🛠️ PCB Design & Routing
The PCB layout cleanly routes the dense dual-processor traces, keeping crystal oscillators close to their respective chips and managing power planes efficiently.
💡 3D Renders
Top View
Bottom View
Parts
33| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 0.1µF | Capacitor_SMD:C_0805_2012Metric | C2, C3, C4, C8, C9, C12 |
| 4 | 22pF | Capacitor_SMD:C_0805_2012Metric | C6, C7, C10, C11 |
| 3 | 10k | Resistor_SMD:R_0805_2012Metric | R5, R6, R9 |
| 2 | 16MHz | Crystal:Crystal_SMD_3215-2Pin_3.2x1.5mm | Y1, Y2 |
| 2 | 22 | Resistor_SMD:R_0805_2012Metric | R3, R4 |
| 2 | 4.7k | Resistor_SMD:R_0805_2012Metric | R7, R8 |
| 2 | 5.1k | Resistor_SMD:R_0805_2012Metric | R1, R2 |
| 2 | Conn_02x03_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x03_P2.54mm_Vertical | J2, J3 |
| 2 | Conn_02x10_Counter_Clockwise | Connector_PinHeader_2.54mm:PinHeader_2x10_P2.54mm_Vertical | J4, J6 |
| 1 | 10µF | Capacitor_SMD:C_1206_3216Metric | C1 |
| 1 | 1µF | Capacitor_SMD:C_0805_2012Metric | C5 |
| 1 | ATmega328P-A | Package_QFP:TQFP-32_7x7mm_P0.8mm | U2 |
| 1 | ATmega32U4-A | Package_QFP:TQFP-44_10x10mm_P0.8mm | U1 |
| 1 | Conn_02x02_Counter_Clockwise | Connector_PinHeader_2.54mm:PinHeader_2x02_P2.54mm_Vertical | J5 |
| 1 | Polyfuse_Small | Resistor_SMD:R_1206_3216Metric | F1 |
| 1 | SW_Push | Button_Switch_SMD:SW_SPST_PTS645Sx43SMTR92 | SW1 |
| 1 | USB_C_Receptacle_USB2.0_16P | Connector_USB:USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J1 |
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Questions
How big is the Micro Uno PCB?
It measures 67.5 × 49 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Micro Uno use?
33 parts, built around the ATMEGA328P-AU and ATMEGA32U4-AU. 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 Micro Uno KiCad files?
From the UgurCelikcan/Micro-Uno repository on GitHub, at the commit this page was made from: the board is micro uno/micro uno.kicad_pcb and its schematic micro uno/micro uno.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Micro Uno design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).