S100 Slave WIFI ESP Wroom-02

communications wifi esp wroom 

Few units in stock


The S100 Master - ESP-WROOM-02 Module is a certified Rhomb.io module that delivers highly integrated Wi-Fi solution to meet users’ continuous demands for efficient power usage, compact design and reliable performance in the Internet of Things industry.

This module has been build around the ESP-WROOM-02 module from Espressif. Its complete and self-contained Wi-Fi networking capabilities can be controlled easily by AT commands through the UART interface. We have added an USB to UART bridge to facilitate the connection to a computer and to easily program and debug the module.

The S100 Master - ESP-WROOM-02 Module integrates a printed circuit antenna with its switches, RF balun, power amplifier, low noise receive amplifier and filters, all of them adjusted to get the best RF performance. The ESP-WROOM-02 is a FCC and CE certified module and you can use it to develop it straight into consumer products.


  • Internet of Things
  • Home automation
  • Smart lighting
  • Security alarms
  • Monitor and scales
  • Mesh Networks
  • Industrial Wireless Control
  • Wereable electronics
  • WiFi Position System Beacons

Module specifications

The S100 Master - ESP-WROOM-02 Module mounts the well-known ESP-WROOM-02 module, which integrates the Espressif ESP8266EX SoC. With the complete and self-contained Wi-Fi networking capabilities, this Rhomb.io module can perform as a host for standalone applications. The ESP8266EX chip is a low-power 32-bit MCU with TCP/IP network stacks, 10-bit ADC and HSPI/UART/PWM/I2C/I2S interfaces embedded. ESP-WROOM-S2 has a 2 MB SPI flash connected to HSPI, working as SDIO/SPI slave, with the SPI speed being up to 8 Mbps.

As said previously, the Module can be controlled easily by AT commands through the UART interface, or connecting it to a computer through USB. I2C and SPI interfaces are also accesible, and a bunch of GPIOs, interruptions and PWM signals make their way to the Rhomb.io connectors.

The module implements TCP/IP, full 802.11 b/g/n WLAN MAC protocol and Wi-Fi Direct specification. It supports not only basic service set (BSS) operations under the distributed control function (DCF) but also P2P group operation compliant with the latest Wi-Fi P2P protocol. Low level protocol functions are handled automatically by the integrated ESP8266EX.

Hardware Specifications
Communication protocols Wi-Fi 802.11 b/g/n
Frequency range 2.4 GHz ~ 2.5 GHz (2400 MHz ~ 2483.5 MHz)
Peripheral interface UART/USB/I2C/SPI/GPIO
Operating voltage 2.8V or 3.3V
Operating current Average: 80 mA
Software Specifications
Wi-Fi mode Station/SoftAP/SoftAP + Station
Security WPA/WPA2
Encryption WEP/TKIP/AES
Firmware upgrade UART Download / OTA (via network) / Download and write firmware via host
Software development Supports Cloud Server Development / SDK for custom firmware development
Network protocols IPv4, TCP/UDP/HTTP/FTP
User configuration AT Instruction Set, Cloud Server, Android/iOS app

Docs & Resources