Tag Archives: Adafruit Metro Mini

The Metro Mini is a tiny dev board powered by an ATmega328


The brainchild of Adafruit, Metro Mini is an easy-to-use, breadboard-friendy chip with USB-to-Serial built in.


Inspired by the countless years of tinkering around with AVR MCUs, Adafruit has unveiled a brand-spanking new, tiny development board for Makers. Dubbed Metro Mini, the breadboard-friendly, easy-to-use chip can be programmed with the Arduino IDE.

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Based on the versatile ATmega328, the Metro Mini packs 32KB of Flash, 2KB of RAM, a clock speed of 16Mhz and comes pre-loaded with the Optiboot bootloader. The slick black and gold unit includes 20 GPIO pins — six of which are analog as well and two reserved for the USB-Serial converter. What’s more, there is also total of six PWMs available on three timers.

“We sure love the ATmega328 here at Adafruit, and we use them a lot for our own projects. The processor has plenty of GPIO, analog inputs, hardware UART SPI and I2C, timers and PWM galore – just enough for most simple projects,” the Adafruit crew writes. “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.”

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Another nice feature is that, measuring just 0.7″ x 1.7″ x 0.2″ in size, the Metro Mini is small enough to be implemented in a wide range of projects. In addition, the device boasts 5V on-board regulator with 150mA out and 3.3V 50mA available via its FTDI chip. Rounding out the beautifully-designed piece are a series of four indicator LEDs for easy debugging and hardware SPI, I2C and UART-to-USB ports.

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“The Metro Mini comes as a fully assembled and tested board, with bootloader burned in and also a stick of 0.1″ header,” Adafruit notes. “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.”

Sound like a dev board for your next project? Head over to its official page here to get started. Looking for something just a little bit bigger? You can always try its larger sibling, the Metro.

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