ESP32-WROOM-32UE WiFi Bluetooth Module Board (Dual-Core, 4MB Flash, U.FL Antenna)

An ESP32 board built for an external antenna

The ESP32-WROOM-32UE is a high-performance Wi-Fi and Bluetooth development board powered by the ESP32 dual-core 32-bit processor. It is designed for IoT, robotics, automation and embedded applications, and its defining feature is a U.FL/IPEX external antenna connector, which lets you fit a better antenna than the small onboard trace antenna most ESP32 boards use.

The processor is a dual-core Xtensa 32-bit LX6 running up to 240 MHz, with 2.4 GHz WiFi (802.11 b/g/n) and Bluetooth v4.2, covering both classic Bluetooth (BR/EDR) and Bluetooth Low Energy.

Specifications

Flash memory is 4 MB SPI flash, with 520 KB of SRAM and 448 KB of ROM. It works from -40 to +85 C. GPIO pins support ADC, DAC, PWM, UART, SPI and I2C, and the board is programmed over USB.

It works with the Arduino IDE, ESP-IDF, MicroPython and PlatformIO, so you can choose the development environment you prefer. Power the module from a clean, adequately rated supply, since radio modules draw current in short bursts that a weak supply cannot follow. Keep the antenna clear of metal and ground planes, and start with the maker's example code before writing your own.

Who it is for

Makers and product developers who want an ESP32 with the option of a stronger external antenna, for projects placed inside a metal enclosure or further from the router.

Choosing between antenna options

If you plan to put the board inside a metal case, or you need range beyond what a small trace antenna gives, this U.FL variant is the one to pick over a standard ESP32 board, since you can attach an external antenna with a proper connector. If your project sits in open air close to the router, the difference matters less.

Questions buyers ask

What antenna does it use?

A U.FL/IPEX connector for an external antenna.

What processor does it have?

A dual-core Xtensa 32-bit LX6 up to 240 MHz.

How much flash memory?

4 MB.