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ESP-WROOM-02 WiFi 802.11 Module



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The ESP-WROOM-02 module is a highly integrated WiFi 802.11 b/g/n module that consumes extremely low power while providing a wireless internet connection for embedded devices. With a very small form factor (18mm by 20mm), this wireless module easily assimilates into resource limited devices. These features make it a great choice for OEMs to connect their IoT (Internet of Things) applications.

Embedded with the ESP8266EX chip, the ESP-WROOM-02 module is a 32-bit low power micro-controller (MCU) that integrates with TCP/IP network stacks; the included 10-bit ACD interfaces with HSPI, SDIO, UART, PWM, I2C and I2S. Programs and firmware can be stored in the integrated SPI flash with 2MB capacity.

The embedded ESP8266EX chip gives the ESP-WROOM-02 module a wake up and transmit packet speed of less than 2ms which makes it a great solution for applications including IoT. Examples are:

  • Home automation and home security
  • Smart lights and plugs
  • Home appliances
  • Sensors and detectors
  • Security alarms
  • Monitor and scales
  • Mesh Networks
  • Industrial Wireless Control
  • Wearable Electronics
  • WiFi Location-aware Devices
  • WiFi Position System Beacons


Part #
GC-ESP-WROOM-02 16M SPI Flash Memory
GC-ESP-WROOM-02-32M 32M SPI Flash Memory

ESP-WROOM-02 WiFi Module Features:

  • 802.11 b/g/n
  • Fast sleep/wake context switching
  • Adaptive radio biasing
  • Advance signal processing

  • Integrated low power 32-bit MCU
  • Integrated TCP/IP protocol stack
  • Integrated TR switch, balun, LNA, power amplifier and matching network
  • Integrated PLL, regulators and power management unit

  • Supports security protocols WPA/WPA2
  • Supports Station / SoftAP / Station+SoftAP operation modes
  • Supports Tranmission Control Protocol (TCP) and User Datagram Protocol (UDP)
  • Supports WiFi Protected Setup (WPS) for easy setup and configuration
  • Supports mesh networking
  • Supports Smart Link Function for both Android and iOS devices
  • Supports Cloud Server Development

  • Custom firmware development via SDK
  • Download and write firmware via host
  • User configuration via AT Instruction Set, Cloud Server and Android/iOs App

  • FCC, CE and TELEC certified

Antenna 2DBi PCB-on-board antenna
Certifications FCC / CE / IC / KCC / NCC / SRRC / TELEC
Dimensions 18mm x 20mm x 3mm
Firmware Upgrade: UART Download / OTA (via network)
Frequency band 2.4GHz-2.5GHz (2400M-2483.5M)
  • Wi-Fi mode: station/SoftAP/SoftAP+station
  • UART, I2S
  • Wake up and transmit packets in < 2ms
  • Deep sleep power 20 uA, Power down leakage current < 0.5 uA
  • +20dBm output power in 802.11b mode
Power consumption Standby power consumption of <1.0mW (DTIM3)
  • WiFi: 802.11 b/g/n
  • Security: WPA/WPA2
  • Encryption: WEP/TKIP/AES
Temperature range Operating: -40ºC to 125ºC (-40ºF to 257ºF)
Voltage Operating: 3.0 ~ 3.6V


ESP-WROOM-02 Datasheet Download (PDF)
ESP-WROOM-02 Reference Design Download (ZIP)
ESP-WROOM-02 PCB Design and Module Placement Guide Download (PDF)
ESP8266 Datasheet Download (PDF)
ESP8266 Quick Start Guide Download (PDF)
ESP8266 FAQs Download (PDF)
ESP8266 SDK Getting Started Guide  Download (PDF)


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