Adafruit
Adafruit Metro Mini 328 - 5V 16MHz
The Adafruit Metro Mini 328 packs the same ATmega328P power as a full-sized Metro into a tiny breadboard-friendly form factor. Running at 16 MHz with 5V logi...
The Adafruit Metro Mini 328 packs the same ATmega328P power as a full-sized Metro into a tiny breadboard-friendly form factor. Running at 16 MHz with 5V logic, it's pin-compatible with Arduino UNO R3 and works with the Arduino IDE by selecting "Arduino UNO" in the Boards menu. For the latest revision with improvements, see the Metro Mini 328 V2.
With a genuine SiLabs CP2104 USB-to-serial converter built in, the Metro Mini connects directly to your computer for programming and serial communication — no FTDI adapter needed. It's ideal for projects where breadboard size matters but you still want full ATmega328P capability.
Key Features
- ATmega328P @ 16 MHz – 32 KB flash, 2 KB RAM with Optiboot bootloader
- Breadboard Friendly – Compact form factor fits standard breadboards
- Arduino UNO Compatible – Pin-compatible and works with Arduino IDE
- 20 GPIO Pins – 6 analogue inputs, 6 PWM outputs, hardware SPI, I2C, and UART
- Built-In USB-to-Serial – SiLabs CP2104 for programming and serial communication
- 5V Logic (3.3V Optional) – Cut and solder a jumper on the bottom to switch
- Flexible Power – 6–16V on Vin pin or Micro USB
- On-Board Regulators – 5V 150 mA output, 3.3V 50 mA available via FTDI chip
- Four Indicator LEDs – Power (green), RX/TX, and pin 13 (red)
Ideal For
- Breadboard prototyping where space is limited
- Compact Arduino UNO-compatible projects
- Embedding in small enclosures and finished projects
- Learning Arduino programming on a tiny board
Package Contents
- 1× Adafruit Metro Mini 328 (fully assembled and tested)
- 1× 0.1" header strip (unsoldered)
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- ATmega328P
- An 8-bit microcontroller chip used on many Arduino Uno-compatible boards. Knowing the controller uses an ATmega328P helps you understand its memory, speed, pin compatibility, and the Arduino sketches it can run.
- Bootloader
- Small starter software on a microcontroller that lets new code be uploaded before the main program runs. Knowing how to enter bootloader mode matters when you need to program the board or recover it after a faulty sketch.
- GPIO
- General-purpose input/output pins are microcontroller pins you can set in software to read signals, switch devices on and off, or connect to peripherals. The number of GPIO pins matters because it limits how many buttons, LEDs, sensors, and other parts you can wire directly to the board.
- I2C
- I2C is a two-wire communication bus used by many sensors and small modules. It matters because several I2C devices can share the same two wires, but each device needs a compatible address and your controller must support I2C.
- IDE
- Short for Integrated Development Environment, a program used to write, run and manage code. It matters because some learners prefer a traditional coding workspace instead of a guided notebook-style lesson.
- PWM
- Pulse Width Modulation is a way for a digital pin to simulate variable output power by switching on and off very quickly. It matters for controlling things like LED brightness, motor speed, or servo-style signals from a microcontroller pin.
- RAM
- RAM is temporary memory used while a device is running, and its contents are lost when power is removed. A “Run in RAM” mode is useful for testing settings without permanently programming the module, but it may not support every feature.
- SPI
- A fast serial communication bus often used for displays, memory cards, and sensors. It matters because SPI devices need specific pins for clock and data, plus a separate chip-select line for each device.
- UART
- UART is a simple serial connection that sends data over separate transmit and receive wires, often labelled TX and RX. It matters because this module is designed to replace a wired UART cable with a wireless link while keeping the same serial data format.
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