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Espressif Systems
ESP8266EX
Hardware User Guide
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:
Table 19 Pin Definitions of 2 UART Interfaces
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.
Category
Pin Definition
Function
UART0
(Pin 25) U0RXD+ (Pin 26) U0TXD
Can be used to receive and send the users’ data
packages
UART1
(Pin 14) GPIO2 (U1TXD)
Can be used to print information
Espressif Systems
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Jun 1, 2015
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