UART TTL to WIFI Module Serial to wifi Support WPS Smart-LINK 802.11

1.1 Product Introduction


Realize TTL and WIFI Network Two-way Transmission

USR-WIFI232-T module is an integration of 802.11 b/g/n wi-fi module, which provides a wireless interface to any equipment with a serial interface for data transfer and has been widely applied in various fields.

It has the following functions:

  • Support IEEE802.11b/g/n Wireless Standards;
  • Support TCP/IP/UDP Network Protocols;
  • Support UART Data Interface;
  • Support Work As STA/AP/AP+STA Mode

Low Price, Small size, Smart Link Function, Support WPS Function


1.2 Product Features

Function Features

  • Support IEEE802.11b/g/n Wireless Standards
  • Support WIFI2.4 GHz, support WEP, WPA/WPA2 security mode.
  • Based on Self-developed High Performance MCU
  • Ultra-Low-Power for Battery Applications with Excellent Power Save Scheme
  • Support UART Data Communication Interface
  • Support Work As STA/AP/AP+STA Mode
  • Support SmartLink Function (APP program provide)
  • Support Wireless Upgrade Function
  • Support WPS Function
  • Support Multi-TCP Link (5 Channel) Apllication
  • Support External Antenna
  • Single +3.3V Power Supply
  • Smallest Size
  • FCC/CE Certificated

Product Parameters

Class Item Parameters
Wireless Parameters Certification FCC/CE
Wireless standard 802.11 b/g/n
Frequency range 2.412GHz-2.484GHz
Transmit Power 802.11b: +16 +/-2dBm (@11Mbps)
802.11g: +14 +/-2dBm (@54Mbps)
802.11n: +13 +/-2dBm (@HT20, MCS7)
Receiver Sensitivity 802.11b: -93 dBm (@11Mbps ,CCK)
802.11g: -85 dBm (@54Mbps, OFDM)
802.11n: -82 dBm (@HT20, MCS7)
Antenna External:I-PEX connector
Hardware Parameters Data Interface UART
Operating Voltage 3.0~3.6V
Operating Current Peak [Continuous TX]: ~200mA
Average. ~12mA, Peak: 200mA
Operating Temp. -40°C- 85°C
Storage Temp. -45°C- 125°C
Dimensions and Size 22mm x 13.5mm x 6mm
Software Parameters Footprint 1×10, 2mm connector
Network Type STA/AP/STA+AP
Security Mechanisms WEP/WPA-PSK/WPA2-PSK
Encryption WEP64/WEP128/TKIP/AES
Update Firmware Local Wireless
Customization Web Page Upgrade
Network Protocol IPv4, TCP/UDP/HTTP
User Configuration AT+command
Website
Android/iOS APP
Smart Link APP tools

1.3 Application Structure

The module supports work as STA/AP/AP+STA Mode

AP WI-FI Mode


STA WI-FI Mode


AP+STA WI-FI Mode


1.4 Pin Definitions



Explantion:

I—N;O—OUT; PU—PUL-UP; I/O—IN/OUT GPIO;

The main pin function description

nRest:

Module reset pin, input GPIO, low effective.

It needs to be pulled up when module works. A reset operation can be done by pulling this pin low for at least 10ms and then pull up.

nReload:

Module recovery factory settings pin, input GPIO, low effective.

  • After module is powerd up, short press this button (Low < 3s) to make the module go into “Smart Link” configuration mode, waiting for APP to set password and other information.
  • After module is powerd up, long press this button (Low > 3s) to make the module recover to factory setting.

nLink:

Wi-F link status indicator pin, output GPIO, low effective. This pin is strongly suggested to connect to an LED.

  • At “Smart Link” configuration mode, this LED used to indicate AP to finish setting.
  • At normal mode, it’s Wi-F link status indicator

nReady:

Module start up success indicator pin, output GPIO, low effective. Can be connected out to led.

WPS:

WPS function star pin, input GPIO, low effective. Can be connected to key.

UART0_TX/RX/CTS/RTS

UART pin

GPIO n:

GPIO which can be controlled by network commands, n is control index number.

PWM_N:

Module PWM signal output pin. Can also be configured as GPIO pin. Can switch

PWM_1 function to nLink, PWM_2 function to nReady, PWM_3 function to WPS keys, by AT command “AT + LPTIO = on”. AT + LPTIO = of” is the opposite.

 

References:

[1] USR-WIFI232-T official website

 

 

 

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