Adafruit 3320 ESP32 WiFi-BT-BLE MCU Module / ESP-WROOM-32

The Adafruit 3320 ESP32 WiFi-BT-BLE MCU Module is a powerful dual-core microcontroller featuring integrated WiFi, Bluetooth Classic, and Bluetooth Low Energy connectivity on a single compact module. IoT developers, embedded systems engineers, and electronics hobbyists rely on this module to build connected applications ranging from smart home devices to industrial IoT solutions. This product solves the critical challenge of integrating wireless connectivity with processing power while maintaining low power consumption and cost-effectiveness, eliminating the need for separate WiFi and Bluetooth modules in most applications.

Product Overview

The ESP32 is built around a dual-core Xtensa 32-bit processor running at up to 240 MHz, providing sufficient computational power for complex signal processing and real-time applications. The module integrates a complete WiFi subsystem supporting 802.11 b/g/n standards with data rates up to 150 Mbps, alongside dual Bluetooth 4.2 radios for both classic and low-energy applications. The chip features 520 KB of SRAM, 4 MB of integrated SPI flash memory, and support for external flash expansion, making it suitable for applications requiring substantial code and data storage. Power management is optimized through multiple sleep modes, with deep sleep consuming as little as 10 microamps, enabling battery-powered IoT devices with extended operational lifespans.

The Adafruit 3320 variant comes pre-soldered on a development-friendly breakout board with all GPIO pins exposed through 0.1-inch headers, eliminating the need for surface-mount soldering. The module includes integrated antenna for both WiFi and Bluetooth, along with support for external antenna connection through an IPEX connector for applications requiring extended range. Built-in voltage regulation accepts 3.3V to 5V input, and the board includes USB-to-serial conversion for programming and debugging directly from Arduino IDE or MicroPython environments. The ESP-WROOM-32 core features certified RF performance meeting FCC, CE, and ISED regulatory requirements, ensuring compliance for commercial product deployment.

Key Specifications

Specification	Details
Product Type	WiFi-BT-BLE MCU Module with Breakout Board
Brand	Adafruit Industries
Origin	Original/Authentic
Warranty	7 days on manufacturing defects
Shipping	1-5 days from Bengaluru
Delivery	7-8 days across India
Support	24/7 via Email and WhatsApp
Processor	Dual-core Xtensa 32-bit @ 240 MHz
RAM	520 KB SRAM
Flash Memory	4 MB SPI Flash (expandable)
WiFi	802.11 b/g/n, 150 Mbps, 2.4 GHz
Bluetooth	Bluetooth 4.2 Classic and BLE
GPIO Pins	34 GPIO pins with multiple functions
ADC Channels	12-bit SAR ADC with 18 channels
Power Supply	3.3V to 5V input with onboard regulator
Deep Sleep Current	10 microamps

Key Features

• Dual-core processor at 240 MHz enabling parallel task execution and real-time processing without blocking wireless operations
• Integrated WiFi 802.11 b/g/n with 150 Mbps throughput for high-speed data transmission to cloud platforms and local networks
• Bluetooth 4.2 supporting both Classic and Low Energy modes, allowing simultaneous connection to legacy devices and modern BLE peripherals
• 520 KB of on-chip SRAM and 4 MB flash providing sufficient memory for complex applications without external memory requirements
• 18-channel 12-bit ADC for precise analog sensor measurements including temperature, humidity, and pressure readings
• Rich peripheral support including SPI, I2C, UART, PWM, and CAN bus for seamless integration with external sensors and actuators
• Ultra-low power deep sleep mode consuming only 10 microamps, extending battery life in portable IoT applications to months or years
• Pre-soldered breakout board with exposed GPIO headers eliminating soldering requirements and reducing development time

Applications and Use Cases

• Smart Home Automation: Control lighting, temperature, and security systems via WiFi with smartphone apps while using BLE for local device communication without internet dependency
• Wearable Devices: Implement fitness trackers and health monitors using BLE for smartphone connectivity with minimal power consumption enabling weeks of battery life
• Industrial IoT Gateways: Deploy edge computing nodes that collect data from multiple Bluetooth sensors and relay processed information to cloud servers via WiFi
• Environmental Monitoring: Build weather stations and air quality monitors that continuously sample sensors via I2C/SPI and upload data to cloud platforms for real-time analytics
• Robotics and Drones: Utilize dual-core processing for motor control and sensor fusion while maintaining WiFi connectivity for remote telemetry and command reception
• Bluetooth Mesh Networks: Create self-healing mesh networks for large-scale sensor deployments in buildings and industrial facilities with automatic routing and redundancy

How to Use

Begin by installing the CH340 USB driver for your operating system to establish serial communication with the module. Connect the Adafruit 3320 to your computer via USB cable, then select the appropriate board (ESP32 Dev Module) and COM port in Arduino IDE. Install the ESP32 board package through the Boards Manager by adding the Espressif repository URL. The module enters bootloader mode automatically during programming, eliminating manual reset procedures. Write your application using the Arduino framework or MicroPython, leveraging the extensive WiFi and Bluetooth libraries available in both ecosystems.

For WiFi connectivity, initialize the WiFi library and provide SSID and password credentials to establish station mode connection. The module supports both TCP and UDP protocols, allowing integration with REST APIs, MQTT brokers, and custom socket-based communication. For Bluetooth applications, use the BLE library to advertise services and characteristics, or configure Classic Bluetooth for legacy device compatibility. Manage power consumption by implementing sleep modes between sensor readings, using the RTC timer to wake the processor at specified intervals. Monitor memory usage through the Serial console and optimize code by profiling execution time with built-in timing functions to ensure real-time responsiveness.

Frequently Asked Questions

Can the ESP32 run both WiFi and Bluetooth simultaneously?

Yes, the ESP32 features dual independent radios allowing simultaneous WiFi and Bluetooth operation. However, both radios share the same 2.4 GHz antenna, which may cause performance degradation if both are transmitting simultaneously. For optimal performance, implement time-division multiplexing or use an external antenna connected to the IPEX connector to improve isolation between the two radios.

What is the maximum current draw and how should I power the module?

The ESP32 draws peak current of 500 mA during WiFi transmission and 120 mA during Bluetooth transmission. Provide a power supply capable of delivering at least 1 A continuous current with low impedance. Use a quality USB power adapter or external 5V supply connected to the VIN pin. Include a 10 microfarad capacitor near the power input to stabilize voltage during high current transients and prevent brownout resets.

How do I extend the range of WiFi and Bluetooth connectivity?

The module includes an IPEX connector for external antenna attachment, which can improve range by 3-6 dB compared to the integrated antenna. Purchase a 2.4 GHz external antenna with IPEX connector rated for WiFi and Bluetooth frequencies. For WiFi, position the antenna vertically for omnidirectional coverage. For Bluetooth, the range extends to approximately 100 meters in open space with the integrated antenna and up to 240 meters with a quality external antenna.

What programming languages and development environments are supported?

The ESP32 supports Arduino IDE using the Espressif ESP32 board package, providing familiar C++ syntax and extensive library ecosystem. MicroPython is also fully supported, enabling rapid prototyping with Python syntax. The Espressif IDF (IoT Development Framework) offers lower-level control for advanced applications requiring optimization. PlatformIO provides an alternative IDE with enhanced project management and library integration across multiple development boards.

When will I receive my order?

Orders are dispatched within 1-5 business days from our Bengaluru warehouse. Delivery takes 7-8 days to most locations across India.

What is your return and warranty policy?

We offer a 7-day return policy on manufacturing defects only. Contact support within 7 days of receipt for free replacement or full refund. Not applicable for user damage or misuse.

Are bulk discounts available?

Yes, wholesale pricing for orders of 10 or more units. Contact our sales team via WhatsApp or email for a customized bulk quote.

Why Buy from The Engineer Store

• Genuine Products: Sourced directly from authorized distributors with authentication
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• Fast Shipping: Dispatched within 1-5 days from our Bengaluru warehouse
• Pan-India Delivery: 7-8 days to Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata
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• Technical Support: 24/7 expert guidance via email and WhatsApp
• Returns: 7-day return policy on manufacturing defects only

Buy Adafruit 3320 ESP32 WiFi-BT-BLE MCU Module / ESP-WROOM-32 Online in India

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