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To write PLEN2's firmware requires Arduino IDE ver.1.6.0 or later. Please download and install it before to do continued steps.
Download "PLEN2" repository.
Open “firmware.ino” (This is placed “/arduino/firmware/” directory) with Arduino IDE.
Choose target board as “Arduino/Genuino Micro”.
Take proper serial port to communicate your base-board. (Port name is different in each environments.)
Click upload button.