Typical Applications; Wifi Smart Hardware Converted From Uart Serial Ports; Sensor; Smart Light - Espressif Systems ESP8266EX Hardware User's Manual

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5.

Typical Applications

5.1.

WiFi smart hardware converted from UART serial ports

The pins on basis of the 2 UART ports are defined below:
Category
(Pin 25) U0RXD+ (Pin 26) U0TXD
UART0
(Pin 14) GPIO2 (U1TXD)
UART1
AT+ instructions and instruction sets documentations are provided for the relevant software.
Application example: ESP8266EX development board as shown in Figure14.
5.2.

Sensor

ESP8266EX can be used to develop sensor products and the interface used is I2C interface. Under
this condition, I2C is working with Master mode and is connected to multiple sensors,
communicating through addressing mode which identifies Slave device (every slave device has a
unique address identity).
Such sensor products will send real-time data through I2C interface to ESP8266EX which will upload
the data to the server wirelessly. When an mobile phone is connected to the public internet, it can
access the data on the server through an app.
5.3.

Smart light

ESP8266EX can be used to develop smart home products such as smart LED lights which use PWM
interfaces and infrared interfaces. The 3 PWM interfaces control the red, blue, green LED lights
respectively. Theoretically speaking, the minimal PWM duty ratio can reach 1/256, thus supporting
256*256*256 types of colors. Besides, the infrared interfaces allow specific control over LED lights,
for example, reset, on/off, adjustment of the colour.
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Pin Definition
Table 19 Pin Definitions of 2 UART Interfaces
40 48 /
ESP8266EX
Function
Can be used to receive and send the users' data
packages
Can be used to print information
Hardware User Guide
Jun 1, 2015