Datasheet

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®