Catalog > Internet of Things (IOT) Related Products > Adafruit Adafruit Metro Mini ATMEGA328 Metro Mini ATMEGA328 Board ADF METRO MINI 328-5V 16MHZ 2590 :: Metro Mini ATMEGA328 5V 16MHz with USB and 20 GPIOs 295.00 ZAR inc for 1 Each 0 in Stock Add Specifications, Prices & Availability may change without notice. Images are for illustration purposes only. E&OE Overview 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. 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) Features ATmega328 brains - This popular chip has 32KB of flash (1/2 K is reserved for the bootloader), 2KB of RAM, clocked at 16MHzPower 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 logic5V onboard regulator with 150mA out, 3.3V 50mA available via FTDI chipUSB 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 bootloaderFour 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 #13Easy reprogramming, comes pre-loaded with the Optiboot bootloaderBeautiful 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 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 socketsMac & Windows People. Don't forget to grab & install the FTDI VCP drivers from FTDI to make the COM/Serial port show up right. The default drivers may not support this FTDI chip. Specifications ATmega328 Microcontroller with Optiboot (UNO) BootloaderUSB Programming and debugging via the well-supported genuine FTDI FT231XInput voltage (Vin) : 6-16V (a 9VDC power supply is recommended)5V logic with 3.3V compatible inputs, can be converted to 3.3V logic operation20 Digital I/O Pins : 6 are also PWM outputs and 6 are also Analog Inputs32KB Flash Memory - 0.5K for bootloader, 31.5KB available after bootloading16MHz Clock SpeedAdafruit Black PCB with gold plate on padsDimensions : 18mm x 44mm x 4mmWeight : 3g References Derivative of "Arduino UNO R3 Reference design"Open source hardware files on GithubFTDI VCP Drivers"