How to Use ESP32 UWD: Examples, Pinouts, and Specs

The ESP32 UWD is a powerful microcontroller developed by MakerFabs with the part ID DW1000. It is designed for Internet of Things (IoT) applications, offering integrated Wi-Fi and Bluetooth capabilities. This versatile module features multiple GPIO pins, analog-to-digital converters (ADCs), and support for various communication protocols, making it an excellent choice for projects requiring wireless connectivity and advanced processing power.

• Smart home devices (e.g., smart lights, thermostats, and security systems)
• Industrial IoT systems for monitoring and automation
• Wearable devices and health monitoring systems
• Robotics and automation projects
• Wireless sensor networks
• Prototyping and educational projects

The following table outlines the key technical specifications of the ESP32 UWD:

The ESP32 UWD features a total of 34 GPIO pins, which can be configured for various functions. Below is a table summarizing the pin configuration:

Note: For a complete pinout diagram, refer to the official datasheet provided by MakerFabs.

1. Powering the Module: Connect the 3V3 pin to a 3.3V power source and GND to ground. Ensure the power supply is stable and within the specified voltage range (3.0V - 3.6V).
2. Programming the ESP32 UWD: Use a USB-to-serial adapter to connect the module to your computer. Install the necessary drivers and use the Arduino IDE or ESP-IDF for programming.
3. Connecting Peripherals: Use the GPIO pins to connect sensors, actuators, or other peripherals. Configure the pins in your code as input or output as needed.
4. Wireless Connectivity: Use the built-in Wi-Fi and Bluetooth features to connect to networks or pair with other devices.

• Voltage Levels: Ensure all connected peripherals operate at 3.3V logic levels to avoid damaging the module.
• Deep Sleep Mode: Use the deep sleep mode to reduce power consumption in battery-powered applications.
• Antenna Placement: Avoid placing the module near metal objects or other RF sources to ensure optimal wireless performance.
• Boot Mode: To enter bootloader mode, hold the GPIO0 pin low while resetting the module.

Below is an example of how to use the ESP32 UWD 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

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

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

Note: Replace Your_SSID and Your_PASSWORD with your Wi-Fi network credentials.

1. Module Not Powering On

   • Cause: Insufficient or unstable power supply.
   • Solution: Ensure the power source provides a stable 3.3V and sufficient current.

2. Wi-Fi Connection Fails

   • Cause: Incorrect SSID or password, or weak signal strength.
   • Solution: Double-check the credentials and ensure the module is within range of the Wi-Fi router.

3. Code Upload Fails

   • Cause: Incorrect COM port or missing drivers.
   • Solution: Verify the correct COM port is selected in the Arduino IDE and install the required USB-to-serial drivers.

4. GPIO Pin Not Responding

   • Cause: Pin conflict or incorrect configuration.
   • Solution: Check the pin configuration in your code and ensure no peripherals are causing conflicts.

Q: Can the ESP32 UWD operate on 5V?
A: No, the ESP32 UWD operates at 3.3V. Connecting it to 5V may damage the module.

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

Q: Can I use the ESP32 UWD with Bluetooth and Wi-Fi simultaneously?
A: Yes, the ESP32 UWD supports simultaneous use of Bluetooth and Wi-Fi, but performance may vary depending on the application.

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

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