Metro M4 Express Airlift
Vendor: Adafruit
Features: Micro USB, ADC, DAC, RGB LED, QSPI Flash, WiFi, BLE, JLink
Source on GitHub: samd/ADAFRUIT_METRO_M4_EXPRESS
More info: Website
Installation instructions
For deploying the MicroPython firmware to the SAMD module, follow the procedure:
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Push the reset button twice or call machine.bootloader(). A drive icon should appear representing a virtual drive.
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Copy the .uf2 file with the required firmware to that drive.
As soon as the drive disappears, the firmware is loaded and started.
Firmware
Nightly builds