Adafruit Metro Mini 328-5V 16MHz

We love the ATmega328, and we use them a lot for our own projects. The processor has various GPIO, Analog inputs, hardware UART SPI and I2C, timers and PWM galore – just enough for most simple projects. When we want to go small, we use a Pro Trinket 3V or 5V, but if you wish 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 also be programmed with the Arduino IDE (select ‘UNO’ in the boards dropdown) 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 would like to plug it into a breadboard, or you’ll be able to solder wires or header directly to the breakout pads. Once headers are installed they are able to be fitted into 0.6″ wide sockets

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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 secure on the Vin pin, or plug the micro USB connector to any 5V USB source.
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’ll be able to easily convert it to 3.3V logic
USB to Serial converter, there’s a genuine FTDI hardware USB to Serial converter that can be utilized by any computer to listen/send data to the METRO, and may also be used to launch and update code via the bootloader