How to Use ESP32-T: Examples, Pinouts, and Specs

The ESP32-T, manufactured by eBox&Widora, is a high-performance microcontroller designed for Internet of Things (IoT) applications. It combines dual-core processing power with integrated Wi-Fi and Bluetooth capabilities, making it a versatile solution for smart devices, home automation, and industrial IoT systems. The ESP32-T supports a wide range of communication protocols and features multiple GPIO pins, enabling seamless integration with sensors, actuators, and other peripherals.

• Smart home devices (e.g., smart lights, thermostats)
• Industrial automation and monitoring
• Wearable technology
• Wireless sensor networks
• Robotics and drones
• IoT prototyping and development

The ESP32-T features a total of 38 pins, with 34 GPIO pins that can be configured for various functions. Below is a summary of the key pins:

Note: Some GPIO pins have specific restrictions or dual functions. Refer to the ESP32-T datasheet for detailed pin multiplexing information.

1. Power Supply: Provide a stable 3.3 V power supply to the 3V3 pin. Connect the GND pin to the ground of your circuit.
2. Programming: Use a USB-to-serial adapter to connect the ESP32-T to your computer. Ensure the EN pin is pulled high to enable the module.
3. Boot Mode: To enter bootloader mode for programming, hold the IO0 pin low while resetting the module.
4. GPIO Configuration: Configure the GPIO pins as input, output, or alternate functions (e.g., ADC, PWM) in your firmware.
5. Wi-Fi and Bluetooth: Use the ESP-IDF or Arduino IDE to program the ESP32-T for wireless communication.

• Voltage Levels: The ESP32-T operates at 3.3 V logic levels. Avoid connecting 5 V signals directly to its GPIO pins.
• Power Consumption: Use deep sleep mode to minimize power consumption in battery-powered applications.
• Antenna Placement: Ensure the onboard antenna has sufficient clearance from metal objects to avoid signal interference.

Below is an example of how to connect the ESP32-T to a Wi-Fi network using the Arduino IDE:

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

// Replace with your network credentials
const char* ssid = "Your_SSID";
const char* password = "Your_PASSWORD";

void setup() {
  Serial.begin(115200); // Initialize serial communication
  delay(1000);

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

  // Wait for the connection to establish
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  Serial.println("\nWi-Fi connected!");
  Serial.print("IP Address: ");
  Serial.println(WiFi.localIP()); // Print the device's IP address
}

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

Tip: Install the ESP32 board package in the Arduino IDE before uploading the code.

1. ESP32-T Not Responding

   • Cause: Incorrect power supply or loose connections.
   • Solution: Ensure a stable 3.3 V power supply and check all connections.

2. Wi-Fi Connection Fails

   • Cause: Incorrect SSID or password.
   • Solution: Double-check your network credentials in the code.

3. GPIO Pin Not Working

   • Cause: Pin conflict or incorrect configuration.
   • Solution: Verify the pin's function and ensure it is not being used for another purpose.

4. High Power Consumption

   • Cause: Module not in sleep mode.
   • Solution: Use deep sleep mode when the module is idle.

• Q: Can the ESP32-T operate on 5 V?
  A: No, the ESP32-T operates at 3.3 V. Use a level shifter for 5 V signals.

• Q: How do I reset the ESP32-T?
  A: Pull the EN pin low momentarily to reset the module.

• Q: Can I use the ESP32-T with the Arduino IDE?
  A: Yes, the ESP32-T is fully compatible with the Arduino IDE. Install the ESP32 board package to get started.

• 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.

By following this documentation, you can effectively integrate the ESP32-T into your IoT projects and troubleshoot common issues. For advanced features, refer to the official ESP32-T datasheet and programming guides.