How to Use ESP32 WROOM-32 C Type CP2102 USB Dual Core WiFi + Bluetooth 38 Pins: Examples, Pinouts, and Specs

The ESP32 WROOM-32 C Type CP2102 USB is a versatile and powerful microcontroller module manufactured by ESP32. It features a dual-core processor, integrated WiFi and Bluetooth capabilities, and 38 GPIO pins, making it ideal for a wide range of IoT, automation, and embedded system applications. The inclusion of the CP2102 USB interface simplifies programming and connectivity, allowing seamless integration with development environments.

• IoT devices and smart home automation
• Wireless sensor networks
• Wearable technology
• Robotics and drones
• Industrial automation
• Prototyping and educational projects

Below are the key technical details of the ESP32 WROOM-32 C Type module:

The ESP32 WROOM-32 C Type module has 38 pins, each with specific functions. Below is a summary of the pin configuration:

Note: For a complete pinout diagram, refer to the official ESP32 datasheet.

1. Powering the Module:

   • Connect the module to a 5V power source via the USB port or supply 3.3V to the VIN pin.
   • Ensure the power supply is stable to avoid damage to the module.

2. Programming the Module:

   • Install the CP2102 USB driver on your computer (available on the manufacturer's website).
   • Use the Arduino IDE or ESP-IDF (Espressif IoT Development Framework) for programming.
   • Select the correct board type (ESP32 Dev Module) and COM port in the IDE.

3. Connecting Peripherals:

   • Use the GPIO pins to connect sensors, actuators, or other peripherals.
   • For I2C devices, use GPIO21 (SDA) and GPIO22 (SCL).
   • For SPI devices, use GPIO18 (SCK), GPIO19 (MISO), and GPIO23 (MOSI).

4. Uploading Code:

   • Press and hold the BOOT button while uploading code to enter programming mode.
   • Release the button once the upload begins.

• Use a level shifter if interfacing with 5V logic devices, as the ESP32 operates at 3.3V logic levels.
• Avoid connecting high-current devices directly to GPIO pins; use transistors or relays instead.
• Use decoupling capacitors near the power pins to ensure stable operation.

Below is an example code to connect the ESP32 to a WiFi network and print the IP address:

#include <WiFi.h> // Include the WiFi library

const char* ssid = "Your_SSID";       // Replace with your WiFi network name
const char* password = "Your_Password"; // Replace with your WiFi password

void setup() {
  Serial.begin(115200); // Initialize serial communication at 115200 baud
  delay(1000);          // Wait for a moment

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

  while (WiFi.status() != WL_CONNECTED) {
    delay(500); // Wait until connected
    Serial.print(".");
  }

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

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

Tip: Replace Your_SSID and Your_Password with your WiFi credentials.

1. Problem: The ESP32 is not detected by the computer.
   Solution:

   • Ensure the CP2102 USB driver is installed correctly.
   • Try a different USB cable or port.

2. Problem: Code upload fails with a timeout error.
   Solution:

   • Press and hold the BOOT button while uploading the code.
   • Check the selected COM port and board type in the Arduino IDE.

3. Problem: WiFi connection fails.
   Solution:

   • Verify the SSID and password.
   • Ensure the WiFi network is within range.

• Q: Can the ESP32 operate on battery power?
  A: Yes, the ESP32 can be powered by a 3.7V LiPo battery connected to the VIN pin.

• Q: How do I reset the ESP32?
  A: Press the EN button to reset the module.

• Q: Can I use the ESP32 with 5V logic devices?
  A: No, the ESP32 operates at 3.3V logic levels. Use a level shifter for compatibility.

This concludes the documentation for the ESP32 WROOM-32 C Type CP2102 USB Dual Core WiFi + Bluetooth 38 Pins module. For further details, refer to the official datasheet or user manual.