Espressif ESP32-WROVER-B 8M 64Mbit Flash WiFi Bluetooth Module

Specifications

• Microcontroller: ESP32-D0WDQ6 (Xtensa® dual-core 32-bit LX6 microprocessor)
• Clock Frequency: Up to 240 MHz
• Operating Voltage: 3.0V ~ 3.6V (Strictly 3.3V Logic. Not 5V tolerant!)
• SPI Flash: 8 MB (64Mbit)
• PSRAM: 8 MB (64Mbit) Pseudo static RAM
• Wireless Connectivity: Wi-Fi 802.11 b/g/n (802.11n up to 150 Mbps)
• Bluetooth Connectivity: Bluetooth v4.2 BR/EDR and Bluetooth Low Energy (BLE)
• Antenna: On-board PCB Antenna
• Interfaces: SD card, UART, SPI, SDIO, I2C, LED PWM, Motor PWM, I2S, IR, pulse counter, GPIO, capacitive touch sensor, ADC, DAC
• Operating Temperature: -40°C ~ 85°C
• Moisture sensitivity level (MSL): Level 3

Applications

• Smart Home Hubs: Act as the central brain processing multiple sensor inputs and MQTT bridges.
• Internet Radio & Audio Streaming: Utilize the 8MB PSRAM as a massive buffer for high-quality I2S audio decoding.
• Edge AI & Machine Learning: Run TensorFlow Lite for Microcontrollers (TinyML) models for voice or image recognition.
• Camera Integration: Buffer high-resolution images from OV2640/OV5640 cameras before transmitting over Wi-Fi.

Unlock New Capabilities

• The Prerequisites: If you've mastered basic Wi-Fi logging using standard ESP32 development boards and are now facing memory overflow errors when compiling large arrays or web interfaces.
• The Feature Upgrade: Upgrading to the WROVER-B unlocks the ability to use the ESP-IDF or Arduino IDE to allocate massive data buffers in the 8MB PSRAM. It allows you to host complex web servers with large SPIFFS partitions directly on the 8MB Flash.

Virtual Technician & Wiring Guide

• ⚠️ CRITICAL WARNING: This module operates strictly at 3.3V. Applying 5V to any GPIO pin or the VCC pin will instantly destroy the module. Ensure you are using a reliable 3.3V regulator (like an AMS1117-3.3) capable of supplying at least 500mA, as Wi-Fi transmission causes significant current spikes.

Basic Flashing Pinout (Minimum Setup):

• 3V3: Connect to 3.3V Power Supply (Min 500mA)
• GND: Connect to Common Ground
• EN (CHIP_PU): Pull HIGH to 3.3V via 10k resistor (Add a 1uF capacitor to GND for auto-reset circuits)
• IO0: Pull LOW to GND during boot to enter flashing mode.
• TXD0: Connect to RX of 3.3V USB-to-TTL Converter
• RXD0: Connect to TX of 3.3V USB-to-TTL Converter

Package Includes:

• 1 x Espressif ESP32-WROVER-B 8M 64Mbit Flash WiFi Bluetooth Module

Frequently Asked Questions (FAQ)

• What is the difference between ESP32-WROOM and ESP32-WROVER?
  The main difference is memory. WROVER modules include additional PSRAM (Pseudo Static RAM) built into the module, making them ideal for memory-heavy tasks like audio and image processing, whereas WROOM modules typically only have the standard internal SRAM.
• How much PSRAM does the ESP32-WROVER-B have?
  This specific module features 8 Megabytes (64 Megabits) of external PSRAM.
• How much Flash memory is on this module?
  It contains 8 Megabytes (64 Megabits) of SPI Flash storage for your program code and file system (SPIFFS/LittleFS).
• Can I program this with the Arduino IDE?
  Yes, you can program it using the Arduino IDE by selecting the "ESP32 Wrover Module" board profile and enabling PSRAM in the tools menu.
• Do I need a custom PCB to use this module?
  Yes, this is a bare surface-mount module with castellated holes (1.27mm pitch). You will need a custom PCB or a specific spring-loaded test fixture to use it.
• What is the operating voltage of the ESP32-WROVER-B?
  It strictly operates between 3.0V and 3.6V. The recommended operating voltage is exactly 3.3V.
• Is the ESP32-WROVER-B 5V tolerant?
  No, none of the GPIO pins are 5V tolerant. Connecting 5V logic will permanently damage the module. Use logic level converters for 5V sensors.
• What kind of antenna does the WROVER-B use?
  The "B" variant uses an onboard PCB trace antenna. (The "IB" variant uses an IPEX connector for external antennas).
• Which GPIO pins are internally used by the PSRAM and Flash?
  Pins GPIO 16, 17, 6, 7, 8, 9, 10, and 11 are generally used for the internal SPI flash and PSRAM. Do not use these pins for your own circuits.
• How much power supply current do I need?
  You must use a 3.3V power supply capable of delivering at least 500mA. Wi-Fi transmission peaks can easily cause brownouts on weaker power supplies.
• Why am I getting a "Brownout detector was triggered" error?
  This occurs when your power supply cannot handle the sudden current draw when the Wi-Fi modem turns on. Ensure your 3.3V regulator is adequate and add bypass capacitors near the power pins.
• How do I put the module into bootloader/flashing mode?
  You need to pull GPIO 0 to GND while toggling the EN (Enable/Reset) pin.
• Can I use MicroPython on the ESP32-WROVER?
  Yes, MicroPython runs exceptionally well on the WROVER module, and the extra PSRAM allows for much larger Python scripts and data structures.
• Does this module support Bluetooth Low Energy (BLE)?
  Yes, it supports both Classic Bluetooth (BR/EDR) and Bluetooth Low Energy (BLE) v4.2.
• What is the maximum Wi-Fi speed supported?
  It supports 802.11 b/g/n, with speeds up to 150 Mbps on the 802.11n standard.
• How do I enable the 8MB PSRAM in the ESP-IDF?
  In your ESP-IDF project configuration (idf.py menuconfig), navigate to Component Config > ESP32-specific > Support for external, SPI-connected RAM, and enable it.
• Is there a sleep mode to save power?
  Yes, it supports multiple power modes, including a Deep Sleep mode that consumes only a few microamps, ideal for battery-powered IoT nodes.
• Can I use this for audio streaming projects?
  Absolutely. The combination of the I2S interface and the massive 8MB PSRAM buffer makes this the perfect chipset for internet radio and audio decoders.