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Adafruit METRO M0 Express - designed for CircuitPython - ATSAMD21G18
Adafruit METRO M0 Express 開發板－配ATSAMD21G18芯片（ada3505）
Revision History:
As of April 27, 2018 we have updated the design to have lower analog noise, replaced the SMT DC jack and headers with through-hole headers and jack, and now ship with CircuitPython already loaded.
自 2018 年 4 月 27 日起，我們更新了設計以降低模擬噪聲，將 SMT DC 插孔和接頭替換為通孔接頭和插孔，現在已加載 CircuitPython。
Metro is our series of microcontroller boards for use with the Arduino IDE. This new Metro M0 Express board looks a whole lot like our original Metro 328, but with a huge upgrade. Instead of the ATmega328, this Metro features a ATSAMD21G18 chip, an ARM Cortex M0+.
At the Metro M0's heart is an ATSAMD21G18 ARM Cortex M0 processor, clocked at 48 MHz and at 3.3V logic, the same one used in the new Arduino Zero. This chip has a whopping 256K of FLASH (8x more than the Atmega328) and 32K of RAM (16x as much)! This chip comes with built in USB so it has USB-to-Serial program & debug capability built in with no need for an FTDI-like chip. Not only can you use CircuitPython, but the Metro M0 is also great for use in the Arduino IDE.
Please note that while this board was our first for CircuitPython usage, better and bigger chips have come out since then! We recommend the Metro M4 for a roomy, speedy, experience.
- Power the METRO with 7-9V polarity protected DC or the micro USB connector to any 5V USB source. The 2.1mm DC jack has an on/off switch next to it so you can turn off your setup easily. The METRO will automagically switch between USB and DC.
- METRO has 25 GPIO pins, 12 of which are analog in, and one of which is a true analog out. There's a hardware SPI port, hardware I2C port and hardware UART. Logic level is 3.3V
- Native USB, there's no need for a hardware USB to Serial converter as the Metro M0 has built in USB support. When used to act like a serial device, the USB interface 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. It can also act like a keyboard, mouse or MIDI device as well.
- Four indicator LEDs and one NeoPixel, on the front edge of the PCB, for easy debugging. One green power LED, two RX/TX LEDs for data being sent over USB, and a red LED connected. Next to the reset button there is an RGB NeoPixel that can be used for any purpose.
- 2 MB SPI Flash storage chip is included on board. You can use the SPI Flash storage like a very tiny hard drive. When used in Circuit Python, the 2 MB flash acts as storage for all your scripts, libraries and files. When used in Arduino, you can read/write files to it, like a little datalogger or SD card, and then with our helper program, access the files over USB.
- Easy reprogramming, comes pre-loaded with the UF2 bootloader, which looks like a USB storage key. Simply drag firmware on to program, no special tools or drivers needed! It can be used to load up CircuitPython, PXT/MakeCode or Arduino IDE (it is bossa-compatible)
Comes fully assembled with headers, tested, and with the UF2 bootloader loaded on. We also include 4 rubber bumpers to keep it from slipping off your desk. No soldering required to use, plug and play!／完全組裝有接頭，經過測試，並加載了 UF2 引導加載程序。我們還包括 4 個橡膠緩衝器，以防止它從您的桌子上滑落。無需焊接即可使用，即插即用！
Good news, CircuitPython now comes preloaded!／現已預裝CircuitPython
Check out our full guide for pinouts, schematics, drivers, instructions, Fritzing object, and more!
