IoT WIFI Modules | Tiny Size IoT UART to WIFI Modules

IoT WiFi Module, Tiny size uart wifi module

Model: USR-C215b

USR-C215b Tiny Size IoT WiFi module integrates MAC, baseband chip and RF transceiver unit. USR-C215 supports WiFi protocol and TCP/IP protocol. Users can realize uart device netwroking via simple configuration.
  • PIN Type, need connect to external antenna
  • 1 TTL Serial Ports Supporting Data Rates of up to 460.8Kbps
  • 3 simultaneous client connections to Soft AP interface

IoT WIFI Modules | Tiny Size IoT UART to WIFI Modules

General Details

Iot Wifi Modules Introduction

The Iot Wifi Modules, used for data transparent transmission.The hardware of USR-C215 wifi module integrates MAC,baseband chip and RF transceiver unit.USR-C215 supports WiFi protocol and TCP/IP protocol.Users can realize uart device networking via simple configuration.


Iot Wifi Modules Features

Support Wi-Fi@2.4 GHz 802.11b/g/n wireless standards

Support WPA/WPA2 security mode.

Support work as AP,STA,AP+STA mode

The fully integrated serial to wifi TCP/UDP transmission function,can choose multiple serial speed

LAN search and wireless parameter setting function

Support TCP/UDP Client registration packet mechanism

Support Simplelink/usrlink rapid networking configuration

Httpd Client function

Support class RFC2217 automatic baud rate adaptive function

Support simple AT+ command set configuration

3.3V power supply

Ultra-low power

Only supports external antenna

Small size: 22 x 13.5 x 6mm


Iot Wifi Modules Application Field

WiFi remote control and monitoring, TCP/IP and WiFi coprocessor

WiFi remote control toy such as aircraft and cars

WiFi Internet radio, camera, digital photo frame

Medical instrument, data acquisition, handheld device

WiFi fatness testing machine, smart card terminal, Smart Home

Instrument, equipment parameter monitoring, wireless POS machine

Modern agriculture, military field and other wireless related secondary development applications


Iot Wifi Modules Function Structure

Iot Wifi Modules Function Structure


Iot Wifi Modules HTTPD Client Mode

Iot Wifi Modules HTTPD Client Mode, serial data submitted to server by HTTP(GET/POST)


Iot Wifi Modules Airkiss Function

Iot Wifi Modules Airkiss Function, Wechat distribution network


Iot Wifi Modules NTP Function

Iot Wifi Modules NTP Function, NTP Server, time calibration


Iot Wifi Modules Networking Modes

AP Mode

Iot Wifi Modules Networking Modes, ap mode, module works as AP


STA Mode

Iot Wifi Modules Networking Modes, STA mode, module works as STA



Iot Wifi Modules Networking Modes, ap+sta mode, module works as AP+STA


More image of Iot Wifi Modules



Wireless Parameters  
Wireless Standard 802.11 b/g/n
Transmit Power 802.11b: +18 +/-1dBm (@11Mbps)
802.11g: +17 +/-1dBm (@54Mbps)
802.11n: +15 +/-1dBm (@HT20, MCS7)
Receive Sensitivity 802.11b: -85 dBm (@11Mbps, CCK)
802.11g: -70 dBm (@54Mbps, OFDM)
802.11n: -68 dBm (@HT20, MCS7)
Antenna External: I-PEX connector
Hardware Parameters  
Data Interface UART
Operating Voltage DC 3.0~3.6V
Operating Current AP: 74mA (average), 285mA (peak)
STA: 32mA (average), 196mA (peak)
Operating Temp. -20~ 85°C
Storage Temp. -55~ 125°C
Size 22 x 13.5 x 6mm
External Interface SIP
Software Parameters  
Wireless Network Type AP, STA, AP+STA
Security Mechanism WPA-PSK/WPA2-PSK
Encryption Type TKIP, AES, TKIP/AES
Network Protocol IPv4, TCP/UDP
User Configuration AT+command
Webpage setting

How to Buy

Official Online ShopClick to order USR-C215b
Alibaba Online ShopClick to order USR-C215b
Contacts SalesYou can leave a message for our sales below.



C21 Series

TI C32 Series

High-performance Series
















STA limits in AP mode

(Qty of TCP Client to access when it works as TCP server)




Size (mm)


22 × 13.5 × 6

22 × 13.5 × 2.7

26.65 × 18.22 × 2.8

40 × 25 × 8

Working Mode




Editable Web Page


Identity Packet

User Configuration

AT+command / Web page setting

Heartbeat Socket


RTS/CTS Flow Control


Ultra-low Power-Deep Sleep




Web socket




Modbus RTU to TCP/





MQTT Protocol






Work Current

AP:AVG-74mA Peak Value:285mA @3.3V

STA:AVG-32mA Peak Value:196mA @3.3V

AVG: 50mA

AP:AVG-169mA Peak Value:305mA @3.3V

STA:AVG-164mA Peak Value:197mA @3.3V

Th minimum power consumption

32mA @3.3V

3.5mA @3.3V

164mA @3.3V

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