Adafruit Metro Mini 328 - 5V 16MHz
PRODUCT ID: 2590
Description
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)
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
USB to Serial converter , there's a genuine SiLabs CP2104 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 the Optiboot 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 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
sockets
Mac & Windows People!
Don't forget to grab & install the FTDI VCP drivers from FTDI
and the
SiLabs CP210x drivers from SiLabs
to make the COM/Serial port show up right! The default
drivers may not support the interface chip!
Technical Details
Revision History:
As of Nov 8th 2016, we are now shipping with the SiLabs CP2104 - a high quality USB-to-Serial
converter that performs as well or better than the FTDI series
Detailed specifications:
ATmega328 microcontroller with Optiboot (UNO) Bootloader
USB Programming and debugging via the well-supported genuine FTDI FT231X or the SiLabs
CP2104
Input voltage (Vin): 6-16V (a 9VDC power supply is recommended)
5V logic with 3.3V compatible inputs, can be converted to 3.3V logic operation
20 Digital I/O Pins: 6 are also PWM outputs and 6 are also Analog Inputs
32KB Flash Memory - 0.5K for bootloader, 31.5KB available after bootloading
16MHz Clock Speed
Adafruit Black PCB with gold plate on pads
18mm x 44mm x 4mm / 0.7" x 1.7" x 0.2"
Weight: 3g
Engineered in NYC Adafruit ®
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