How to Use ESP32-WROVER-E: Examples, Pinouts, and Specs

The ESP32-WROVER-E is a high-performance Wi-Fi and Bluetooth microcontroller module developed by Espressif Systems. It features dual-core processing, integrated flash storage, and ample memory, making it an excellent choice for a wide range of IoT (Internet of Things) applications. With its robust wireless connectivity and processing power, the ESP32-WROVER-E is ideal for smart home devices, industrial automation, wearable electronics, and more.

• IoT devices and smart home systems
• Wireless sensor networks
• Industrial automation and control systems
• Wearable electronics
• Audio streaming and voice recognition systems
• Prototyping and development of connected devices

The ESP32-WROVER-E module is designed to deliver high performance and flexibility. Below are its key technical specifications:

The ESP32-WROVER-E module has a total of 38 pins. Below is a table describing the key pins:

For the complete pinout and detailed descriptions, refer to the official datasheet provided by Espressif.

The ESP32-WROVER-E is versatile and can be used in a variety of circuits. Below are the steps and best practices for using the module:

1. Power Supply: Ensure the module is powered with a stable 3.3V supply. Avoid exceeding the maximum voltage of 3.6V.
2. Boot Mode: To upload code, connect GPIO0 to GND during reset to enter bootloader mode.
3. Connections: Use the UART pins (TXD0, RXD0) for programming and debugging. Connect the EN pin to 3.3V through a pull-up resistor.
4. Antenna: Ensure the onboard antenna has a clear path for optimal wireless performance.
5. Programming: Use the Arduino IDE, ESP-IDF, or other supported development environments to program the module.

The ESP32-WROVER-E can be programmed using the Arduino IDE. Below is an example code snippet to connect the module to a Wi-Fi network:

#include <WiFi.h> // Include the Wi-Fi library for ESP32

// Replace with your network credentials
const char* ssid = "Your_SSID";
const char* password = "Your_PASSWORD";

void setup() {
  Serial.begin(115200); // Initialize serial communication
  delay(1000); // Wait for the serial monitor to initialize

  Serial.println("Connecting to Wi-Fi...");
  WiFi.begin(ssid, password); // Start Wi-Fi connection

  // Wait until the ESP32 connects to the Wi-Fi network
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  Serial.println("\nWi-Fi connected!");
  Serial.print("IP Address: ");
  Serial.println(WiFi.localIP()); // Print the assigned IP address
}

void loop() {
  // Add your main code here
}

• Power Supply: Use a low-noise, regulated 3.3V power supply to avoid instability.
• GPIO Voltage Levels: Ensure all GPIO pins operate at 3.3V logic levels. Avoid 5V signals.
• Antenna Placement: Keep the antenna area free from metal objects to ensure optimal wireless performance.
• Deep Sleep Mode: Use deep sleep mode to minimize power consumption in battery-powered applications.

1. Module Not Responding

   • Cause: Incorrect power supply or wiring.
   • Solution: Verify the power supply voltage (3.3V) and check all connections.

2. Wi-Fi Connection Fails

   • Cause: Incorrect SSID or password.
   • Solution: Double-check the network credentials in your code.

3. Code Upload Fails

   • Cause: GPIO0 not grounded during reset.
   • Solution: Ensure GPIO0 is connected to GND when uploading code.

4. Unstable Operation

   • Cause: Noisy power supply or improper grounding.
   • Solution: Use a decoupling capacitor (e.g., 10 µF) near the power pins and ensure proper grounding.

Q: Can the ESP32-WROVER-E be powered with 5V?
A: No, the module operates at 3.3V. Exposing it to 5V can damage the module.

Q: How do I reset the module?
A: Pull the EN pin low momentarily to reset the module.

Q: Can I use the ESP32-WROVER-E with the Arduino IDE?
A: Yes, the ESP32-WROVER-E is fully compatible with the Arduino IDE. Install the ESP32 board package to get started.

Q: What is the maximum range of the Wi-Fi connection?
A: The range depends on environmental factors but typically extends up to 100 meters in open space.

For additional support, refer to the official Espressif documentation and community forums.