Data Sheet
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Espressif Systems
ESP8266 Datasheet
Altogether three interfaces have been deļ¬ned, one is for the button, and the other two is for LED
light. Generally, MTCK is used to control the reset button, GPIO0 is used as an signal to indicate the
WiFi working state, MTDI is used as a signal light to indicate communication between the device and
the server.
Note: Among the nine interfaces mentioned above, most of them can be multiplexed. Pin
definitions that can be defined is not limited to the eight ones herein mentioned,
customers can self customise the functions of the pins according to their specific
application scenarios. Functions of these pins can be implemented via software
programming and hardware.
Espressif Systems / August 1, 2015
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