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ESP-WROOM-02

ESP-WROOM-02

Espressif Systems
Official Espressif module variant suitable for designs requiring vendor-supported modules.
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Overview

The ESP-WROOM-02 is a compact Wi-Fi module based on the ESP8266EX SoC, designed for cost-effective wireless connectivity in embedded systems. It integrates an 802.11b/g/n radio, an on-board trace antenna, and a complete TCP/IP stack within an 18mm by 20mm footprint. This module is a vendor-supported, FCC/CE certified solution suitable for moving from prototype to production with minimal RF design effort.

Why Choose This Part

It offers an impressive output power of 20.5dBm for reliable range and a low deep-sleep current of 0.9uA for battery-sensitive applications. The module's wide operating temperature range of -40C to 105C allows for deployment in demanding industrial environments where standard consumer-grade modules may fail.

Applications

Smart Home Appliances
Adding Wi-Fi connectivity to light switches, smart plugs, and thermostats for remote control via mobile apps.
Industrial Sensor Nodes
Transmitting sensor data from the field to a central server using the integrated ADC and UART/I2C interfaces over 2.4GHz Wi-Fi.
Wireless Serial Bridges
Replacing physical cables with a transparent UART-to-Wi-Fi bridge for legacy equipment monitoring.

Key Specifications

Protocol 802.11b/g/n
Data Rate 72.2Mbps
Frequency 2.4GHz ~ 2.5GHz
Modulation 64-QAM, BPSK, CCK, OFDM
Memory Size 4MB Flash, 50kB RAM
Sensitivity -98dBm
Antenna Type Integrated, Trace
Mounting Type Surface Mount
Package / Case 18-SMD Module
Power - Output 20.5dBm
Voltage - Supply 2.7V ~ 3.6V
Serial Interfaces ADC, GPIO, I2C, I2S, SPI, PWM, UART
RF Family/Standard WiFi
Utilized IC / Part ESP8266EX
Current - Receiving 50mA ~ 56mA
Operating Temperature -40degC ~ 85degC
Current - Transmitting 120mA ~ 170mA

Getting Started

Developers can use the Espressif IoT Development Framework (ESP8266 RTOS SDK) or the popular Arduino core for ESP8266. Programming is typically handled via the UART interface using the ESPTOOL utility, and hardware evaluation can be performed using the ESP8266-DevKitC or similar breakout boards.

Also Consider

ESP32-WROOM-32E Espressif Systems - Provides a dual-core processor, Bluetooth/BLE support, and significantly more GPIO pins if the ESP8266 resources are insufficient.
ESP-WROOM-02D Espressif Systems - An updated version of the WROOM-02 with optimized RF performance and a built-in 4MB SPI flash.