How to Use ESP32-S3 WROOM: Examples, Pinouts, and Specs

The ESP32-S3 WROOM, manufactured by Freenove (Part ID: ESP32), is a powerful microcontroller module designed for Internet of Things (IoT) applications. It features integrated Wi-Fi and Bluetooth capabilities, a dual-core processor, and a wide range of GPIO pins, making it ideal for projects requiring wireless communication, edge computing, and versatile connectivity.

• Smart home devices (e.g., smart lights, thermostats)
• Wearable technology
• Industrial IoT systems
• Wireless sensor networks
• Robotics and automation
• Edge AI and machine learning applications

The ESP32-S3 WROOM is a high-performance module with the following key specifications:

The ESP32-S3 WROOM has a versatile pinout. Below is a table summarizing the key pins and their functions:

For a complete pinout diagram, refer to the official Freenove ESP32-S3 WROOM datasheet.

1. Powering the Module: Connect the VIN pin to a 3.3V power source and GND to ground. Ensure the power supply is stable and within the specified voltage range.
2. Programming the Module: Use a USB-to-serial adapter or a development board to upload code to the ESP32-S3 WROOM. The module supports programming via the Arduino IDE, PlatformIO, or the ESP-IDF framework.
3. Connecting Peripherals: Use the GPIO pins to connect sensors, actuators, or other peripherals. Ensure the connected devices operate at 3.3V logic levels to avoid damage.
4. Wireless Communication: Configure the Wi-Fi and Bluetooth settings in your code to enable wireless communication.

• Voltage Levels: The ESP32-S3 WROOM operates at 3.3V. Avoid connecting 5V logic devices directly to its GPIO pins.
• Heat Management: While the module is efficient, prolonged operation at high clock speeds may generate heat. Ensure proper ventilation or heat dissipation in your design.
• Deep Sleep Mode: Use the deep sleep mode to conserve power in battery-operated projects.
• Boot Mode: To enter boot mode for programming, hold GPIO0 low while resetting the module.

Below is an example of how to use the ESP32-S3 WROOM with the Arduino IDE to connect 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 at 115200 baud
  delay(1000); // Wait for a second to stabilize the serial monitor

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

  while (WiFi.status() != WL_CONNECTED) {
    delay(500); // Wait for 500ms before checking the connection status again
    Serial.print("."); // Print a dot to indicate progress
  }

  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
}

1. Module Not Powering On:

   • Ensure the VIN pin is supplied with a stable 3.3V power source.
   • Check all connections for loose wires or poor solder joints.

2. Unable to Upload Code:

   • Verify that the correct COM port and board type are selected in the Arduino IDE.
   • Ensure GPIO0 is held low during the reset process to enter boot mode.

3. Wi-Fi Connection Fails:

   • Double-check the SSID and password in your code.
   • Ensure the Wi-Fi network is within range and not using unsupported security protocols.

4. GPIO Pin Malfunction:

   • Confirm that the connected peripherals are operating at 3.3V logic levels.
   • Avoid exceeding the maximum current rating of the GPIO pins (12 mA per pin).

Q: Can the ESP32-S3 WROOM operate on 5V?
A: No, the module operates at 3.3V. Supplying 5V directly to the module may damage it.

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

Q: Can I use the ESP32-S3 WROOM for Bluetooth audio applications?
A: Yes, the module supports Bluetooth 5.0, which can be used for audio streaming and other Bluetooth applications.

Q: What is the maximum Wi-Fi range of the ESP32-S3 WROOM?
A: The range depends on environmental factors but typically extends up to 100 meters in open spaces.

For additional support, refer to the official Freenove documentation or community forums.