What is an ESP32-WROOM

The ESP32-WROOM is a microcontroller module with WiFi and Bluetooth capabilities, which provides strong and efficient performance and is used for building IoT projects. ESP32-WROOM is a chip that can be integrated into PCB. This article covers the details of ESP32-WROOM and explains how it is different from the ESP32 DEVKIT DOIT board.

Introduction to ESP32-WROOM

The ESP32-WROOM was created by Espressif Systems. This device is based on the ESP32 chip, which is a single-chip solution that combines dual-core processing, WiFi, and Bluetooth capabilities. It is compact, cost-effective, and provides a low-power solution for IoT applications.

Features of ESP32-WROOM

With its diverse set of features, the ESP32-WROOM module is well-suited for IoT projects. Some of the key features of ESP32-WROOM are:

Dual-core Processor

The ESP32-WROOM is powered by a dual-core processor, which means it can handle multiple tasks simultaneously. This makes it the best IoT board for complex IoT applications.

WiFi and Bluetooth Connectivity

The ESP32-WROOM module comes with built-in WiFi and Bluetooth connectivity. This allows it to connect to electronic devices such as smartphones and computers.

Low Power Consumption

Compared to other microcontroller modules, the ESP32-WROOM is energy-efficient and consumes less power. This makes it ideal for battery-powered IoT applications.

Set of Peripherals

The ESP32-WROOM module comes with different peripherals, including SPI, I2C, UART, ADC, DAC, PWM, and more. This makes it easy to interface with sensors, actuators, and other devices.

Different ESP32-WROOM Module

Following is the list of different variants of ESP32-WROOM modules available:

  • ESP32-WROOM-32
  • ESP32-WROOM-32D-16MB
  • ESP32-WROOM-32E
  • ESP32-WROOM-32U-16MB
  • ESP32-WROOM-32UE

ESP32-WROOM-32E is an updated model of the ESP32-WROOM-32. The ESP32-WROOM-32E has a different pinout and a better PCB antenna than the ESP32-WROOM-32 but has the same flash and PSRAM specifications.

ESP32-WROOM-32D-16MB has 4 times more flash memory than the standard ESP32-WROOM-32 module, which has 4MB flash.

ESP32-WROOM-32D-4MBHT is designed for high-temperature usage. It can bear temperatures up to 105°C.

ESP32-WROOM-32UE is a newer version of the ESP32-WROOM-32U module with an external antenna U.FL connector, which allows for better antenna performance.

ESP32-WROOM-32U-16MB has 4 times more flash memory than the ESP32-WROOM-32U module, which has 4MB flash.

ESP32-WROOM-32U-4MBHT is also designed for excess temperature-demanding applications.

ESP32-WROVER-E has 4MB flash and 8MB PSRAM, making it a good choice for applications that require more memory than the standard ESP32-WROOM-32 module. It also has an external antenna connector for better antenna performance.

Technical Specification of ESP32 WROOM

Some main highlights of ESP32 WROOM are:

  • ESP32 WROOM contains two Xtensa 32-bit LX6 microprocessors
  • ESP32 WROOM has 448 KBytes ROM
  • 520 KBytes of SRAM integrated on the chip.
  • ESP32 WROOM contains 8 KBytes SRAM in RTC FAST and RTC SLOW
  • Bluetooth v4.2 BR/EDR and BLE specification
  • The ESP32-WROOM module supports different WiFi modes, including Station, softAP, SoftAP+station, and P2P.
  • The ESP32-WROOM module supports security protocols such as WPA/WPA2/WPA2-Enterprise/WPS, encryption methods such as AES/RSA/ECC/SHA, and network protocols including IPv4, IPv6, SSL, TCP/UDP/HTTP/FTP/MQTT.
  • The ESP32-WROOM module offers a variety of interfaces, including SD-card, UART, SPI, SDIO, I2C, PWM, I2S, IR, touch sensor, ADC, and DAC.
  • ESP32 WROOM temperature range is between -40 + 85C
  • ESP32 WROOM operates between 2.2-3.6V
  • Total of up to 80 mA current consumption
  • Dimensions: 18 mm x 20 mm x 3 mm
  • ESP32 WROOM also has Hall and temperature sensor

Is ESP32 DEVKIT the Same as ESP32 WROOM?

ESP32-WROOM-32 is an SMD module that can be integrated inside a PCB. ESP32 WROOM is a module that contains an ESP32 chip along with other peripherals. Some of those peripherals include the crystal oscillator for clock generation, flash memory, and filter capacitors.

ESP32 DEVKIT DOIT is a development board that has an ESP32 WROOM module soldered on it, along with other components such as a USB-to-UART bridge, a micro-USB port, a power regulator, pin headers, and buttons.

So, ESP32 WROOM and ESP32 DEVKIT DOIT are not the same, but the latter includes the former as one of its components. We can use ESP32 DEVKIT DOIT to program and interface with the ESP32 WROOM module easily.


The ESP32-WROOM is a powerful microcontroller module that provides WiFi and Bluetooth connectivity. It is compact, cost-effective, and provides a low-power solution for IoT applications. With its dual-core processor, built-in WiFi, and Bluetooth connectivity, the ESP32-WROOM is ideal for a wide range of IoT applications such as home automation. To read more on ESP32-WROOM, read the article.

About the author


I am an Electrical Engineer. I love to write about electronics. I am passionate about writing and sharing new ideas related to emerging technologies in the field of electronics.