ESP-12S User Manual
Shenzhen Ai-Thinker Technology Co., Ltd
http://www.ai-thinker.com
7
products.
I2C
IO14(SCL),
IO2(SDA)
I2C interface can be used to connect external sensor products and
display screens, etc.
UART
UART0:
TXD(U0TXD),
RXD(U0RXD),
IO15(RTS),
IO13(CTS)
UART1:
IO2(TXD)
Devices with UART interfaces can be connected with the module.
Downloading: U0TXD+U0RXD or GPIO2+U0RXD
Communicating: UART0: U0TXD, U0RXD, MTDO (U0RTS), MTCK
(U0CTS)
Debugging: UART1_TXD (GPIO2) can be used to print debugging
information.
By default, UART0 will output some printed information when the
device is powered on and is booting up. If this issue exerts influence
on some specific applications, users can exchange the inner pins of
UART when initializing, that is to say, exchange U0TXD, U0RXD with
U0RTS, U0CTS.
I2S
I2S Input
：
IO12 (I2SI_DATA) ;
IO13 (I2SI_BCK );
IO14 (I2SI_WS);
I2S interface is mainly used for collecting, processing, and
transmission of audio data.
I2S Output:
：
IO15 (I2SO_BCK );
IO3 (I2SO_DATA);
IO2 (I2SO_WS ).
