ESP8266 Serial WiFi Module – ESP-WROOM-02D (2MB Flash, 16Mbit, UART Wireless)

Description

Product Overview

The ESP-WROOM-02D is a highly integrated, certified Wi-Fi module developed by Espressif Systems, the original creator of the ESP8266 ecosystem. This module represents the official, production-ready implementation of the ESP8266EX chip, offering reliable RF performance, comprehensive certifications, and a compact form factor ideal for both prototyping and mass production .

At its heart lies the ESP8266EX chip—a 32-bit Tensilica L106 RISC processor running at up to 160 MHz, with 2 MB (16 Mbit) of SPI flash memory integrated into the module. This provides ample storage for firmware, web interfaces, and OTA (Over-The-Air) updates. The module supports 802.11 b/g/n Wi-Fi protocols at 2.4 GHz, with a built-in PCB antenna that delivers up to +20.5 dBm output power and excellent receiver sensitivity down to -98 dBm .

As an optimized version of the original ESP-WROOM-02, the D variant features enhanced RF performance and a refined PCB layout for superior wireless stability. It comes preloaded with AT command firmware, allowing you to add Wi-Fi connectivity to any microcontroller using simple serial commands, or you can reprogram it as a standalone IoT processor using the Arduino IDE, MicroPython, or ESP-IDF.

Whether you are building smart home devices, industrial sensors, wireless data loggers, or consumer electronics, the ESP-WROOM-02D delivers the reliability, performance, and certification readiness your project demands.

Key Features

• Official Espressif Module: Designed and manufactured by Espressif Systems, the creators of the ESP8266, ensuring the highest quality and reliable RF performance .

• Optimized RF Performance: Enhanced version of the original ESP-WROOM-02 with improved PCB layout and RF tuning for superior wireless stability and range .

• 2 MB Flash Memory: Equipped with 2 MB (16 Mbit) of SPI flash memory, providing sufficient storage for firmware, web interfaces, and OTA (Over-The-Air) firmware updates .

• Integrated 32-bit Processor: Powered by the Tensilica L106 32-bit RISC processor running at up to 160 MHz, capable of running application code independently without an external microcontroller .

• Complete Wi-Fi Solution: Supports 802.11 b/g/n protocols at 2.4 GHz with integrated PCB antenna. Delivers up to +20.5 dBm output power with receiver sensitivity down to -98 dBm .

• Preloaded AT Command Firmware: Ships with industrial-grade AT firmware that allows control via simple serial commands, enabling rapid integration with any microcontroller .

• Multiple Operating Modes: Supports Station (STA), SoftAP (Access Point), and SoftAP + STA modes, enabling devices to connect to existing networks or create their own .

• Rich Peripheral Interfaces: Provides UART, HSPI, I2C, I2S, IR Remote Control, PWM, and 10-bit ADC interfaces, allowing connection to a wide variety of sensors, actuators, and display devices .

• Ultra-Low Power Consumption: Features multiple sleep modes with deep sleep current as low as 20 µA and standby power consumption less than 1.0 mW, making it ideal for battery-powered applications .

• Global Regulatory Certifications: Certified with FCC, CE-RED, TELEC, KCC, IC, NCC, and SRRC, simplifying the certification process for commercial products .

• Wide Operating Temperature: Rated for operation from -40°C to +85°C, suitable for demanding industrial environments and outdoor installations .

• Compact SMD Package: Measures just 18.0 mm × 20.0 mm × 3.2 mm with 18 castellated pins, designed for automated surface-mount assembly .

• Upgradable Firmware: Supports local serial flashing, OTA (Over-The-Air) updates, and host download for flexible firmware management .

Technical Specifications