Adafruit Metro Mini 328 – Arduino-Compatible – 5V 16MHz


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SKU: 1178444
  1. 5V logic with 3.3V compatible inputs can be converted to a 3.3V logic operation
  2. 32KB Flash Memory – 0.5K for bootloader
  3. Four indicator LEDs
  4. Easy reprogramming
  5. 31.5KB available after bootloading
  6. 16MHz Clock Speed


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Brand: Adafruit
Category: Boards Compatible with Arduino

We use the ATmega328 for a lot of projects. The processor has plenty of GPIO, Analog inputs, hardware UART SPI and I2C, timers and PWM galore – just enough for most simple projects. When we need to go small, we use a Pro Trinket 3V or 5V, but if you want to have USB-to-Serial built-in, we reach for an Adafruit METRO Mini.

METRO Mini is the culmination of years of playing with AVRs: we wanted to make a tiny, breadboard-friendly development board that is easy to use and is hacker-friendly. Metro Mini can be programmed with the Arduino IDE (select ‘UNO’ in the boards dropdown)

  • ATmega328 brains – This popular chip has 32KB of flash (1/2 K is reserved for the bootloader), 2KB of RAM, clocked at 16MHz
  • Power the METRO Mini with 6-16V polarity protected on the Vin pin, or plug the micro USB connector to any 5V USB source.
  • METRO has 20 GPIO pins, 6 of which are Analog in as well, and 2 of which are reserved for the USB-serial converter. There’s also 6 PWMs available on 3 timers (1 x 16-bit, 2 x 8-bit). There’s a hardware SPI port, hardware I2C port and hardware UART to USB.
  • GPIO Logic level is 5V but by cutting and soldering closed a jumper on the bottom, you can easily convert it to 3.3V logic
  • 5V onboard regulator with 150mA out, 3.3V 50mA available via FTDI chip
  • USB to Serial converter, there’s a genuine FTDI hardware USB to Serial converter that can be used by any computer to listen/send data to the METRO and can also be used to launch and update code via the bootloader
  • Four indicator LEDs, on the top of the PCB, for easy debugging. One green power LED, two RX/TX LEDs for the UART, and a red LED connected to pin PB5 / digital #13
  • Easy reprogramming, comes pre-loaded with the Optiboot bootloader
  • Beautiful styling by PaintYourDragon and Bruce Yan, in Adafruit Black with gold, plated pads.

The Metro Mini comes as a fully assembled and tested board, with a bootloader burned in and also a stick of 0.1″ header. Some light soldering is required if you’d like to plug it into a breadboard, or you can solder wires or header directly to the breakout pads. Once headers are installed they can be fitted into 0.6″ wide sockets.

Note: There are 2 variants of this products as micro USB and C type USB, you’ll get any of these 2 randomly.


  1. ATmega328 brains
  2. 5V onboard regulator
  3. Four indicator LEDs
  4. Easy reprogramming

Package Includes:

1 x Adafruit Metro Mini 328

SKU: 1178444 Category:

ATmega328 microcontroller

Flash Memory


Clock Speed


Logic input voltage(V)


Input voltage (Vin)

6-16V (a 9VDC power supply is recommended)

Digital I/O Pins


Weight (g):


Dimensions (mm)

18mm x 44mm x 4mm / 0.7″ x 1.7″ x 0.2″

Shipping Weight 0.006 kg
Shipping Dimensions 9 × 7 × 1 cm
3 Months Warranty

This item is covered with a standard supplier warranty of 3 months from the time of delivery against manufacturing defects only. This is a quality product & only manufacturing defects are covered under this warranty. Reimbursement or replacement will be done against manufacturing defects.

What voids warranty:

If the product is subject to misuse, tampering, static discharge, accident, water or fire damage, use of chemicals & soldered or altered in any way.

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Country Of Origin: United States