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ESP32 with Antenna

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ESP32-WROOM-32U Development Board with External WiFi Antenna – 38 Pin

The ESP32-WROOM-32U Development Board is a powerful WiFi and Bluetooth development platform featuring an external antenna connector for improved antenna placement and wireless performance.

Unlike standard ESP32 boards with an integrated PCB antenna, this version uses an IPEX/U.FL antenna connection and is supplied with an external 2.4GHz antenna and adapter cable.

It is ideal for IoT, robotics, automation, wireless sensor networks and applications where the ESP32 is installed inside an enclosure or where improved antenna positioning is required.

Technical Specifications

  • Module: ESP32-WROOM-32U
  • Processor: Dual-Core 32-bit Xtensa LX6
  • Maximum CPU Frequency: 240MHz
  • Flash Memory: 4MB on standard ESP32-WROOM-32U version
  • 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 4.2
  • Module Operating Voltage: 3.0–3.6V
  • Typical Logic Voltage: 3.3V
  • Development Board Power: 5V through Micro-USB
  • USB-to-UART: CP2102
  • Development Board Pins: 38
  • External Antenna Connector: IPEX / U.FL Compatible
  • Recommended Antenna Impedance: 50Ω
  • External Antenna: Included
  • USB Connector: Micro-USB
  • Interfaces: UART, SPI, I²C, I²S, PWM, ADC, DAC, Touch & GPIO
  • Programming: Arduino IDE / ESP-IDF and compatible ESP32 environments

External WiFi Antenna

The ESP32-WROOM-32U differs from standard ESP32-WROOM modules by using an external antenna connector instead of an onboard PCB antenna.

The module supports a compatible:

2.4GHz / 50Ω External Antenna

The supplied antenna connects through the included IPEX/U.FL-to-SMA adapter cable.

An external antenna can be especially useful when:

  • The ESP32 is installed inside an enclosure
  • Better antenna positioning is required
  • The controller is mounted inside equipment
  • The PCB antenna would otherwise be obstructed
  • The antenna needs to be positioned away from electrical noise sources

WiFi Connectivity

The ESP32 supports 2.4GHz IEEE 802.11 b/g/n WiFi.

It can operate in:

  • Station Mode
  • Soft Access Point Mode
  • Station + Access Point Mode

This makes it suitable for both connecting to an existing WiFi network and creating its own wireless access point.

Bluetooth Connectivity

In addition to WiFi, the ESP32 provides:

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

This allows the same development board to communicate with smartphones, tablets, Bluetooth peripherals and compatible BLE devices.

38-Pin Development Board

This version uses the common 38-pin ESP32 development-board layout, providing access to a wide range of ESP32 GPIO and peripheral functions.

Available functions include:

  • Digital Input / Output
  • ADC
  • DAC
  • PWM
  • Capacitive Touch
  • UART
  • SPI
  • I²C
  • I²S
  • Interrupts

USB Programming

The onboard CP2102 USB-to-UART converter allows the ESP32 to be programmed directly from a computer using the Micro-USB connection.

The USB connection can be used for:

  • Programming
  • Serial Monitoring
  • Debugging
  • Board Power

Development Platforms

The board can be programmed using:

  • Arduino IDE
  • Espressif ESP-IDF
  • PlatformIO
  • MicroPython
  • Other ESP32-Compatible Development Environments

Applications

Ideal for:

  • IoT Devices
  • Robotics
  • Home Automation
  • Industrial Automation Prototypes
  • Wireless Sensor Networks
  • Remote Monitoring
  • Smart Home Projects
  • WiFi Control Systems
  • Bluetooth Projects
  • Environmental Monitoring
  • Data Logging
  • MQTT Applications
  • Embedded Web Servers
  • University Projects
  • Educational Electronics
  • ESP32 Development

Important Notes

  • This is the external-antenna ESP32-WROOM-32U version.
  • Connect a suitable antenna before using WiFi or Bluetooth.
  • The external antenna should be designed for 2.4GHz operation with 50Ω impedance.
  • ESP32 GPIO operates at 3.3V logic.
  • Do not apply 5V directly to GPIO pins.
  • The Micro-USB connector provides power and programming connectivity to the development board.
  • Flash capacity should be verified from the actual module marking if your stock differs from the standard 4MB version.
  • This is a 38-pin development board.

Package Includes

  • 1 × ESP32-WROOM-32U 38-Pin Development Board
  • 1 × IPEX/U.FL-to-SMA Antenna Cable
  • 1 × 2.4GHz External Antenna

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