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 aPro Trinket 3Vor5V, 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 METROMiniwith 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. Theres also 6 PWMs available on 3 timers (1 x 16-bit, 2 x 8-bit). Theres a hardware SPI port, hardware I2C port and hardware UART to USB.
• GPIO Logic level is 5Vbut by cutting and soldering closed a jumper on the bottom, you can easily convert it to 3.3V logic
• 5V onboard regulatorwith 150mA out, 3.3V 50mA available via FTDI chip
• USB to Serial converter, theres 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 theOptiboot 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 youd 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, youll get any of these 2 randomly.

Features:

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

Package Includes:

1 x Adafruit Metro Mini 328