Control Switch: to control the serial connection between ESP8266 and arduino control board
、
G：GND
5V：5V Power Output
A：connecting to analog port（A0-A3）of arduino control board
UART: connecting to serial communication port（5V GND RX TX）of arduino control board
IIC: connecting to IIC communication port（5V, GND, SDA, SCL）of arduino control board
UART: connecting to serial communication port（3.3V, GND, RX, TX）of ESP8266 module
OTH
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