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

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Width : 2.01 inch
Height : 0.04 inch
Length : 4.02 inch

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ASIN : B01I08JIEM