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

Introduction

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.

Explore Projects Built with ESP32-WROVER-IE (38pin)

Use Cirkit Designer to design, explore, and prototype these projects online. Some projects support real-time simulation. Click "Open Project" to start designing instantly!

ESP32-Based Multi-Sensor Health Monitoring System with Bluetooth Connectivity

This circuit features an ESP32-WROOM-32UE microcontroller as the central processing unit, interfacing with a variety of sensors and modules. It includes a MAX30100 pulse oximeter and heart-rate sensor, an MLX90614 infrared thermometer, an HC-05 Bluetooth module for wireless communication, and a Neo 6M GPS module for location tracking. All components are powered by a common voltage supply and are connected to specific GPIO pins on the ESP32 for data exchange, with the sensors using I2C communication and the modules using UART.

Open Project in Cirkit Designer

ESP32-Controlled WS2812 RGB LED Strip

This circuit features an ESP32 Wroom Dev Kit microcontroller connected to a WS2812 RGB LED strip. The ESP32's GPIO 4 is used to send data to the LED strip's data input (DIN), while both the ESP32 and the LED strip share a common ground. A separate Vcc power source is connected to the 5V pin of the LED strip to provide power.

Open Project in Cirkit Designer

ESP32-Based Infrared Proximity Sensing System

This circuit features an ESP32 Wroom microcontroller connected to an Infrared Proximity Sensor. The ESP32's GPIO33 is interfaced with the sensor's output, allowing the microcontroller to read proximity data. The sensor is powered by the ESP32's 5V output, and both devices share a common ground.

Open Project in Cirkit Designer

ESP32-Based GPS Tracker with SD Card Logging and Barometric Sensor

This circuit features an ESP32 Wroom Dev Kit as the main microcontroller, interfaced with an MPL3115A2 sensor for pressure and temperature readings, and a Neo 6M GPS module for location tracking. The ESP32 is also connected to an SD card reader for data logging purposes. A voltage regulator is used to step down the USB power supply to 3.3V, which powers the ESP32, the sensor, and the SD card reader.

Open Project in Cirkit Designer

Common Applications and Use Cases

• 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

Technical Specifications

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

Key Technical Details

• 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

Pin Configuration and Descriptions

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

Usage Instructions

How to Use the ESP32-WROVER-IE in a Circuit

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.).

Important Considerations and Best Practices

• 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.

Example Code for Arduino UNO

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
}

Troubleshooting and FAQs

Common Issues and Solutions

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.

FAQs

• 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.