Espressif ESP32-WROVER-IB 4M 32Mbit Flash WiFi Bluetooth Module

Specifications

• Microcontroller: ESP32-D0WDQ6 Dual-core 32-bit LX6 microprocessor
• Clock Frequency: Up to 240 MHz
• Integrated crystal: 40 MHz crystal
• Flash Memory: 4MB (32Mbit) SPI Flash
• PSRAM: 8MB (64Mbit) SPI Pseudo Static RA
• On-chip sensor: Hall sensor
• Wireless Connectivity: Wi-Fi 802.11 b/g/n (802.11n up to 150 Mbps)
• Bluetooth: Bluetooth v4.2 BR/EDR and BLE specification
• Antenna Interface: IPEX / U.FL connector (External Antenna Required)
• Operating Voltage: 3.0V ~ 3.6V DC
• Minimum current: 500 mA
• Operating Temperature: -40°C ~ 85°C
• Moisture sensitivity level (MSL): Level 3

Applications 

• Industrial IoT Gateways: Mount the board inside a waterproof metal panel and run the antenna outside.
• Audio Streaming Devices: Use the 8MB PSRAM to buffer internet radio streams or process local voice commands.
• Edge AI & TinyML: Run complex TensorFlow Lite micro models for object detection or gesture recognition.
• Smart Agriculture: Extended WiFi range for sensors deployed across large distances using a high-gain directional antenna.

Unlock New Capabilities

• Past Projects: If you've mastered standard ESP32-WROOM boards but are constantly hitting Out of Memory errors or losing WiFi signal through walls...
• Feature Upgrade: ...this WROVER-IB module unlocks high-speed data logging, advanced image/audio buffering, and industrial-grade wireless range.
• Effort Level: Advanced. This is a bare surface-mount module. You will need a custom PCB or a breakout board, a 3.3V LDO regulator, and a USB-to-TTL programmer to use it.

Virtual Technician & Wiring Guide

• ⚠️ CRITICAL WARNING: This module operates strictly on 3.3V logic. Connecting 5V directly to the VCC or any GPIO pin will permanently destroy the chip. It is Probots Lab Verified to draw up to 500mA during active WiFi transmission spikes; ensure your 3.3V regulator (like an AMS1117-3.3) can handle this current.
•  VCC: Connect to a stable 3.3V power supply (Min 500mA output).
• GND: Connect to common Ground.
• EN Pin: Requires a 10k pull-up resistor to 3.3V and a 0.1uF capacitor to GND for proper booting.
• GPIO0: Must be pulled LOW to GND during boot to enter flashing/programming mode.
• TXD0 / RXD0: Connect to your USB-to-TTL serial adapter (Cross over: TX to RX, RX to TX).

Package Includes:

• 1 x Espressif ESP32-WROVER-IB 4M 32Mbit Flash WiFi Bluetooth Module

Frequently Asked Questions (FAQ)

• What is the difference between ESP32-WROOM and ESP32-WROVER?
  The primary difference is that WROVER modules include additional PSRAM (Pseudo Static RAM), usually 8MB, allowing for memory-intensive tasks like audio buffering and AI processing.
• What does the "IB" stand for in WROVER-IB?
  The "I" denotes the series revision, and the "B" (or U in some naming conventions) indicates the use of an IPEX (U.FL) connector for an external antenna, rather than an onboard PCB trace antenna.
• Do I need an external antenna to use this module?
  Yes, the WROVER-IB does not have an internal antenna. You must connect a 2.4GHz antenna via the IPEX connector for WiFi and Bluetooth to function.
• How do I enable the 8MB PSRAM in Arduino IDE?
  Go to Tools -> Board -> ESP32 Wrover Module. Then, under Tools -> PSRAM, select "Enabled".
• Can I power this module directly with a 5V supply?
  No. The absolute maximum voltage is 3.6V. Using 5V will instantly destroy the module. You must use a 3.3V regulator.
• Are the GPIO pins on the ESP32 5V tolerant?
  No, all GPIO pins are strictly 3.3V logic. You need logic level converters if interfacing with 5V sensors.
• Why am I getting a "Brownout detector was triggered" error?
  This happens when the power supply cannot deliver the sudden surge of current (up to 500mA) required when the WiFi radio turns on. Upgrade your power supply or add bulk decoupling capacitors near the module.
• Which pins are internally used for the Flash and PSRAM?
  GPIOs 6, 7, 8, 9, 10, 11, 16, and 17 are typically reserved for the integrated SPI flash and PSRAM. Do not use these pins for your own circuits.
• How do I put the module into flash mode?
  Pull GPIO0 LOW (to GND) and momentarily pull the EN (Enable) pin LOW to reset the board. It will boot into UART download mode.
• Is this compatible with MicroPython and CircuitPython?
  Yes, it is fully compatible. You must download the specific firmware build for the ESP32-WROVER (with SPIRAM support) to utilize the extra memory.
• What is the maximum SPI speed supported?
  The hardware SPI can run up to 80 MHz, depending on the connected peripheral and trace routing.
• Can I use Bluetooth and WiFi at the same time?
  Yes, the ESP32 supports coexistence, but they share the same physical antenna and radio, so bandwidth will be time-multiplexed.
• Does this module have internal pull-up resistors?
  Yes, most GPIOs have software-configurable internal pull-up and pull-down resistors (approx. 45k Ohm).
• Can I hand-solder this module?
  Yes, the castellated edges (half-holes) allow for hand-soldering onto a custom PCB or a breakout board using a fine-tipped soldering iron.
• What type of programmer do I need?
  Any standard 3.3V USB-to-TTL serial adapter (like CP2102, CH340, or FT232RL) will work for programming.
• Does this support OTA (Over-The-Air) updates?
  Yes, with 4MB of Flash, you can partition the memory to support OTA updates via WiFi.
• What is the deep sleep current consumption?
  In deep sleep mode with the ULP coprocessor running, it consumes roughly 10µA to 150µA depending on the wake-up configuration.
•  Are the ADC pins accurate?
  The ESP32 ADCs are known to have some non-linearity. For highly precise measurements, external ADCs or software calibration maps are recommended.