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ESP-WROOM-02 - Wi-Fi 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 or 4MB 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



Compare ESP-WROOM-02 Series


Order Summary


Flash Memory
Manufacturer Part #
Limited Quantities Available
4MB ESP32-WROOM-02 (4 MB)

Features of the ESP-WROOM-02

  • Wi-Fi 802.11 b/g/n
  • Integrates with the ESP8266EX chip
  • Internal PCB antenna
  • 2 MB or 4 MB SPI flash memory
  • Tensilica L106 32-bit RISC processor
  • 26-MHz crystal oscillator
  • Secure (encrypted) over the air (OTA) upgrades
  • SRRC, FCC, CE (RED), IC, NCC, KCC, TELEC (MIC) certified
  • Programmable RAM/ROM interface (iBus)
  • Programmable Data RAM interface (dBus)
  • AHB interface accesses the register
Antenna Internal On-Board PCB antenna
Certifications RF: SRRC, FCC, CE (RED), IC, NCC, KCC, TELEC (MIC)
Green: RoHS, REACH
Wi-Fi: Wi-Fi Alliance
Dimensions 18 mm x 20 mm x 2.8 mm
Firmware Upgrade: UART Download / OTA (via network)
Download and write firmware via host
Frequency band Wi-Fi: 2.4 GHz ~ 2.5 GHz (2400M ~ 2483.5M)
Interfaces UART/HSPI/I2C/I2S/IR Remote Control
Memory 2 MB or 4 MB
Power Average Current: 80 mA
Minimum Current: 500 mA
Protocols Wi-Fi: 802.11 b/g/n
Security/Protection Security: WPA/WPA2
Encryption: WEP/TKIP/AES
Temperature range Operating: -40ºC to 85ºC (-40ºF to 185ºF)
Storage: -40ºC to 85ºC (-40ºF to 185ºF)
Voltage Operating: 2.7V ~ 3.6V


ESP-WROOM-02 Datasheet View (PDF)
ESP-WROOM-02 PCB Design and Module Placement Guide View (PDF)
ESP8266 Datasheet View (PDF)
ESP8266 Quick Start Guide View (PDF)


ESP8266 AT Bin Download (ZIP)

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