How to Use LilyGo T7670E ESP32: Examples, Pinouts, and Specs

The LilyGo T7670E ESP32 is a compact and versatile development board designed for Internet of Things (IoT) applications. It features the powerful ESP32 microcontroller, known for its dual-core processing capabilities, integrated Wi-Fi, and Bluetooth connectivity. Additionally, the T7670E chip enhances power management and provides robust connectivity options, making this board an excellent choice for low-power IoT devices, smart home systems, and wearable technology.

• IoT devices and smart home automation
• Wearable technology
• Wireless sensor networks
• Prototyping and development of Bluetooth and Wi-Fi-enabled devices
• Low-power data logging and monitoring systems

Note: For a complete pinout diagram, refer to the official LilyGo documentation.

1. Powering the Board:

   • Connect the board to a 5V power source using the USB-C port.
   • Alternatively, supply 3.3V directly to the 3V3 pin for low-power applications.

2. Programming the Board:

   • Use the Arduino IDE or ESP-IDF (Espressif IoT Development Framework) to program the ESP32.
   • Install the necessary ESP32 board support package in the Arduino IDE.
   • Connect the board to your computer via USB-C and select the appropriate COM port.

3. Connecting Peripherals:

   • Use the GPIO pins to connect sensors, actuators, or other peripherals.
   • Ensure that the voltage levels of connected devices are compatible with the 3.3V logic of the ESP32.

4. Uploading Code:

   • Write your code in the Arduino IDE or ESP-IDF.
   • Click the upload button to flash the code to the ESP32.
   • Monitor the serial output using the Serial Monitor in the Arduino IDE.

• Voltage Levels: Avoid applying voltages higher than 3.3V to the GPIO pins to prevent damage.
• Power Management: Utilize the T7670E chip's low-power modes for battery-powered applications.
• Wi-Fi and Bluetooth: Ensure proper antenna placement for optimal wireless performance.
• Debugging: Use the onboard UART pins for debugging and serial communication.

The following example demonstrates how to connect the LilyGo T7670E ESP32 to a Wi-Fi network and print the IP address:

#include <WiFi.h>

// 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 serial monitor to initialize

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

  while (WiFi.status() != WL_CONNECTED) {
    delay(500); // Wait for connection
    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
}

1. The board is not detected by the computer:

   • Ensure the USB-C cable supports data transfer (not just charging).
   • Check if the correct drivers for the ESP32 are installed on your computer.

2. Code upload fails:

   • Verify that the correct COM port is selected in the Arduino IDE.
   • Press and hold the "BOOT" button on the board while uploading the code.

3. Wi-Fi connection issues:

   • 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 pins not working as expected:

   • Confirm that the pins are not being used for other functions (e.g., UART, SPI).
   • Check for short circuits or incorrect wiring in your circuit.

Q: Can I power the board using a battery?
A: Yes, you can use a 3.7V LiPo battery connected to the appropriate pins. Ensure proper voltage regulation.

Q: Is the board compatible with MicroPython?
A: Yes, the ESP32 supports MicroPython. You can flash the MicroPython firmware to the board and use it for development.

Q: How do I reset the board?
A: Press the "RST" button on the board to perform a hardware reset.

Q: Can I use the board for Bluetooth Low Energy (BLE) applications?
A: Yes, the ESP32 supports BLE, making it suitable for low-power Bluetooth applications.