ESP32-WROOM-32U Development Board – WiFi, Bluetooth & External Antenna Connector

The ESP32-WROOM-32U Development Board is a powerful WiFi and Bluetooth microcontroller platform featuring an external antenna connector for applications requiring flexible antenna placement or improved wireless installation.

Powered by the ESP32 dual-core processor running at up to 240MHz, the board is suitable for IoT, robotics, home automation, wireless sensors, industrial prototypes and embedded applications.

Unlike standard ESP32-WROOM-32 boards with an integrated PCB antenna, the ESP32-WROOM-32U uses an external antenna connection.

Technical Specifications

• Module: ESP32-WROOM-32U
• Processor: Xtensa 32-bit LX6 Dual-Core
• Maximum CPU Frequency: 240MHz
• ROM: 448KB
• SRAM: 520KB
• RTC SRAM: 8KB
• Flash Memory: 4MB
• WiFi: IEEE 802.11 b/g/n
• WiFi Frequency: 2.4GHz
• Maximum 802.11n PHY Rate: Up to 150Mbps
• Bluetooth: Bluetooth 4.2 BR/EDR
• Bluetooth Low Energy: BLE
• Module Operating Voltage: 3.0–3.6V
• GPIO Logic Level: 3.3V
• USB Connector: Micro-USB
• External Antenna Connector: U.FL / IPEX MHF I Compatible
• Recommended Antenna Frequency: 2.4GHz
• Recommended Antenna Impedance: 50Ω
• BOOT Button: Yes
• RESET / EN Button: Yes
• Header Pitch: 2.54mm

External Antenna Connection

The main difference between the ESP32-WROOM-32U and standard ESP32-WROOM-32 modules is the antenna configuration.

The ESP32-WROOM-32U does not use an integrated PCB antenna. Instead, it provides an external RF connector compatible with:

• U.FL
• IPEX MHF I
• AMC-compatible connectors

A suitable external antenna should typically be:

• Frequency: 2.4GHz
• Impedance: 50Ω

The external antenna configuration is particularly useful when:

• The controller is installed inside an enclosure
• The antenna needs to be positioned outside a metal/plastic housing
• Flexible antenna positioning is required
• The PCB location is not ideal for an integrated antenna
• The antenna needs to be positioned away from interference sources

WiFi

The ESP32 provides integrated 2.4GHz WiFi supporting:

• IEEE 802.11 b/g/n
• Station Mode
• Soft Access Point Mode
• Station + Access Point Mode
• Up to 150Mbps 802.11n PHY rate

Bluetooth

The ESP32-WROOM-32U supports:

• Bluetooth 4.2 BR/EDR
• Bluetooth Low Energy (BLE)

This allows communication with compatible smartphones, tablets, sensors and other Bluetooth devices.

Available Interfaces

The ESP32 provides a wide range of interfaces including:

• GPIO
• ADC
• DAC
• Capacitive Touch
• PWM
• UART
• SPI
• I²C
• I²S
• SD / SDIO / MMC
• TWAI / CAN-Compatible Controller
• Pulse Counter
• Motor PWM

USB Programming

The onboard Micro-USB connection provides convenient connectivity for:

• Firmware Uploading
• Serial Communication
• Serial Monitoring
• Board Power
• Development

Programming Support

The ESP32 is compatible with popular development environments including:

• Arduino IDE
• ESP-IDF
• PlatformIO
• MicroPython

Applications

Ideal for:

• IoT Projects
• Robotics
• Home Automation
• Wireless Sensor Networks
• Industrial Automation Prototypes
• Remote Monitoring
• Smart Agriculture
• MQTT Applications
• Embedded Web Servers
• Data Logging
• WiFi Controllers
• Bluetooth Devices
• Environmental Monitoring
• University Projects
• Educational Electronics
• Embedded Systems

Important Notes

• This board uses the ESP32-WROOM-32U external-antenna module.
• An external antenna is required for normal wireless operation.
• Use a suitable 2.4GHz, 50Ω antenna.
• ESP32 GPIO operates at 3.3V logic.
• Do not apply 5V directly to GPIO pins.
• WiFi supports 2.4GHz only, not 5GHz.
• The ESP32-WROOM-32U module contains 4MB SPI Flash.
• If your supplied version does not include an antenna, the antenna must be purchased separately.
• An external transceiver is required to connect the TWAI controller to a physical CAN bus.

Package Includes

1 × ESP32-WROOM-32U Development Board

External antenna and USB cable are not included.