# Arduino UNO Mini Limited Edition

> Miniaturised collector's Arduino UNO with ATmega328P at 16 MHz in a 34.2 × 26.7 mm form factor with USB-C, individually numbered and signed by Arduino's founders.

## Quick Facts

- **Brand:** Arduino
- **Board Type:** dev-board
- **Price:** ~$45
- **Product Readiness:** developer
- **CPU:** ATmega328P @ 16 MHz
- **CPU Architecture:** AVR 8-bit
- **CPU Cores:** 1
- **RAM:** 2 KB SRAM
- **Flash:** 32KB
- **Power:** 5V via USB-C or 6-12V input
- **Operating Voltage:** 5V
- **Dimensions:** 34.2 × 26.7 mm

## Open Source

- **Firmware:** Yes
- **Schematics:** Yes
- **PCB Layout:** Yes

## Compatible Firmware

arduino

## Use Cases

- iot
- educational-platform

## Components

- **ATmega328P** (mcu): Microchip ATmega328P 8-bit AVR microcontroller at 16 MHz with 32 KB Flash, 2 KB SRAM, 1 KB EEPROM, 14 digital I/O, and 6 analogue inputs. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fww1.microchip.com%2Fdownloads%2Fen%2FDeviceDoc%2FAtmel-7810-Automotive-Microcontrollers-ATmega328P_Datasheet.pdf&ref=openhardware.directory&product=arduino-uno-mini-limited-edition&source=md-export)

## Protocols

- **I2C**: SDA: A4, SCL: A5
- **SPI**: MOSI: D11, MISO: D12, SCK: D13, SS: D10
- **UART**: TX: D1, RX: D0
- **USB**: 

## GPIO Map

| Pin | Name | Type | Functions |
|-----|------|------|-----------|
| D0 | RX | UART | UART, GPIO |
| D1 | TX | UART | UART, GPIO |
| D2 | GPIO | GPIO | GPIO, interrupt |
| D3 | GPIO | GPIO | GPIO, PWM, interrupt |
| D4 | GPIO | GPIO | GPIO |
| D5 | GPIO | GPIO | GPIO, PWM |
| D6 | GPIO | GPIO | GPIO, PWM |
| D7 | GPIO | GPIO | GPIO |
| D8 | GPIO | GPIO | GPIO |
| D9 | GPIO | GPIO | GPIO, PWM |
| D10 | SS | SPI | SPI, GPIO, PWM |
| D11 | MOSI | SPI | SPI, GPIO, PWM |
| D12 | MISO | SPI | SPI, GPIO |
| D13 | SCK | SPI | SPI, GPIO |
| A0 | ADC0 | ADC | ADC, GPIO |
| A1 | ADC1 | ADC | ADC, GPIO |
| A2 | ADC2 | ADC | ADC, GPIO |
| A3 | ADC3 | ADC | ADC, GPIO |
| A4 | SDA | I2C | I2C, ADC, GPIO |
| A5 | SCL | I2C | I2C, ADC, GPIO |

## Available Software

- **[Arduino IDE](https://openhardware.directory/r?to=https%3A%2F%2Fwww.arduino.cc%2Fen%2Fsoftware&ref=openhardware.directory&product=arduino-uno-mini-limited-edition&source=md-export)**

## Description

## Overview

The Arduino UNO Mini Limited Edition is a miniaturised version of the iconic Arduino UNO, shrunk down to 34.2 × 26.7 mm while preserving the ATmega328P microcontroller, 16 MHz crystal, and full complement of 14 digital I/O pins and 6 analogue inputs. The pin pitch is reduced to 1.27 mm (half the classic UNO spacing), so it is not directly shield-compatible, but all the same peripheral capabilities remain accessible.

USB-C replaces the original Type-B connector, bringing modern connectivity to this classic design. The board runs at 5 V with a 16 MHz clock, matching the original UNO's behaviour so existing sketches port without modification. The 32 KB of Flash, 2 KB of SRAM, and 1 KB of EEPROM are identical to any standard UNO.

Each unit is individually numbered and shipped in a special collector's box with the signatures of Arduino's co-founders. The limited-edition release was aimed at celebrating the Arduino platform's history and making it available to collectors and enthusiasts who wanted the UNO in a more compact form.

The board is programmed via the Arduino IDE exactly as a standard UNO, supporting the entire Arduino library ecosystem. It is suitable for education, prototyping lightweight sketches, and as a conversation piece for the Arduino community.

## Where to Buy

- [Adafruit](https://openhardware.directory/r?to=https%3A%2F%2Fwww.adafruit.com%2Fproduct%2F5333&ref=openhardware.directory&product=arduino-uno-mini-limited-edition&source=md-export) — 45

## Resources

- [product](https://openhardware.directory/r?to=https%3A%2F%2Fwww.adafruit.com%2Fproduct%2F5333&ref=openhardware.directory&product=arduino-uno-mini-limited-edition&source=md-export)
- [github](https://openhardware.directory/r?to=https%3A%2F%2Fgithub.com%2Farduino%2FArduinoCore-avr&ref=openhardware.directory&product=arduino-uno-mini-limited-edition&source=md-export)
- [manufacturer](https://openhardware.directory/r?to=https%3A%2F%2Fstore.arduino.cc%2Fproducts%2Farduino-uno-mini&ref=openhardware.directory&product=arduino-uno-mini-limited-edition&source=md-export)

## Tags

`arduino`, `uno`, `atmega328p`, `limited-edition`, `mini`, `usb-c`, `collector`

## Images

![Arduino UNO Mini Limited Edition](https://nbg1.your-objectstorage.com/openhardware-directory/entities/arduino-uno-mini-limited-edition/99cc26af61a0.jpg)
![Arduino UNO Mini Limited Edition](https://nbg1.your-objectstorage.com/openhardware-directory/entities/arduino-uno-mini-limited-edition/423770a31dd6.jpg)
![Arduino UNO Mini Limited Edition](https://nbg1.your-objectstorage.com/openhardware-directory/entities/arduino-uno-mini-limited-edition/8493717cffe8.jpg)

---
[View full device page](https://openhardware.directory/devices/arduino-uno-mini-limited-edition)