ESP8266 Boards: http://arduino-esp8266.readthedocs.io/en/latest/boards.html#
Board Manager 選 NodeMCU 1.0 (ESP-12E Module)
virtual box setting ….
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http://arduino-esp8266.readthedocs.io/en/latest/reference.html
** LED_BUILTIN = GPIO16
High Price:
http://goods.ruten.com.tw/item/show?21406251499766
Low price: