How to Use ESP32-WROVER-IE (38pin): Examples, Pinouts, and Specs

The ESP32-WROVER-IE (38pin) is a powerful Wi-Fi and Bluetooth microcontroller module designed for high-performance IoT applications. It features a dual-core processor, integrated memory, and support for a wide range of peripherals, making it suitable for tasks such as wireless communication, data processing, and sensor integration. Its compact design and robust capabilities make it a popular choice for developers building smart devices, home automation systems, and industrial IoT solutions.

• Smart home devices (e.g., smart lights, thermostats)
• Industrial IoT systems (e.g., remote monitoring, predictive maintenance)
• Wearable technology
• Wireless sensor networks
• Robotics and automation
• Prototyping and development of IoT projects

The ESP32-WROVER-IE (38pin) module is packed with advanced features and specifications:

• Processor: Dual-core Xtensa® 32-bit LX6 CPU, up to 240 MHz
• Wireless Connectivity:
  • Wi-Fi: 802.11 b/g/n
  • Bluetooth: v4.2 BR/EDR and BLE
• Memory:
  • 4 MB PSRAM
  • 4 MB Flash
• Operating Voltage: 3.3V
• GPIO Pins: 34 (configurable for various functions)
• Interfaces:
  • SPI, I2C, I2S, UART, PWM, ADC, DAC
• Operating Temperature: -40°C to +85°C
• Dimensions: 18 mm x 31.4 mm

The ESP32-WROVER-IE (38pin) module has 38 pins, each with specific functions. Below is the pinout description:

1. Power Supply: Connect the 3.3V pin to a stable 3.3V power source and GND to ground.
2. Programming: Use a USB-to-serial adapter to connect the module to your computer. Ensure the EN pin is pulled high to enable the module.
3. GPIO Configuration: Configure the GPIO pins as needed for your application (e.g., input, output, ADC, PWM).
4. Peripherals: Connect external devices (e.g., sensors, actuators) to the appropriate pins based on their communication protocol (SPI, I2C, UART, etc.).

• Voltage Levels: Ensure all connected devices operate at 3.3V logic levels to avoid damaging the module.
• Antenna Placement: Keep the onboard antenna area clear of metal objects to ensure optimal wireless performance.
• Power Supply Stability: Use a decoupling capacitor (e.g., 10 µF) near the power pins to stabilize the power supply.
• Boot Mode: To enter bootloader mode for programming, hold the IO0 pin low while resetting the module.

The ESP32-WROVER-IE can be programmed using the Arduino IDE. Below is an example of a basic Wi-Fi connection:

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

const char* ssid = "Your_SSID";       // Replace with your Wi-Fi SSID
const char* password = "Your_Password"; // Replace with your Wi-Fi password

void setup() {
  Serial.begin(115200); // Initialize serial communication
  WiFi.begin(ssid, password); // Start Wi-Fi connection

  Serial.print("Connecting to Wi-Fi");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print("."); // Print dots while connecting
  }

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

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

1. Wi-Fi Connection Fails:
   • Solution: Double-check the SSID and password. Ensure the router is powered on and within range.
2. Module Not Detected by Computer:
   • Solution: Verify the USB-to-serial adapter is properly connected. Install the correct USB driver for your adapter.
3. GPIO Pins Not Responding:
   • Solution: Ensure the pins are correctly configured in your code. Check for short circuits or incorrect wiring.
4. Overheating:
   • Solution: Verify the power supply voltage is 3.3V. Avoid overloading the module with excessive current.

• Q: Can the ESP32-WROVER-IE operate on 5V?
  A: No, the module operates at 3.3V. Use a voltage regulator if your power source is 5V.

• Q: How do I reset the module?
  A: Pull the EN pin low momentarily or press the reset button (if available).

• Q: Can I use the ESP32-WROVER-IE with Arduino libraries?
  A: Yes, the module is compatible with the Arduino IDE and supports many libraries.

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

This documentation provides a comprehensive guide to using the ESP32-WROVER-IE (38pin) module effectively.