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

Introduction

The ESP32 T-Internet-PoE by LILYGO (Part ID: T-Internet-POE) is a versatile microcontroller board designed for Internet of Things (IoT) applications. It combines the powerful ESP32 microcontroller with integrated Wi-Fi and Bluetooth capabilities, making it ideal for wireless communication. Additionally, it features Power over Ethernet (PoE) support, enabling the board to receive both power and data through a single Ethernet cable. This simplifies installation, reduces wiring complexity, and makes it suitable for remote or hard-to-reach deployments.

Explore Projects Built with ESP32 T-Internet-Poe

Use Cirkit Designer to design, explore, and prototype these projects online. Some projects support real-time simulation. Click "Open Project" to start designing instantly!

ESP32-POE-ISO Wi-Fi Controlled 4-Channel Relay Module

This circuit features an ESP32-POE-ISO microcontroller connected to a 4-channel 30A 5V relay module. The ESP32 controls the relay channels via its GPIO pins, allowing for the switching of high-power devices through the relay module.

Open Project in Cirkit Designer

ESP32-Controlled AC Lighting System with Power Monitoring

This circuit features an ESP32 microcontroller interfaced with a PZEM004T power monitoring module and a 4-channel relay module controlling multiple AC LED bulbs. The ESP32 uses GPIO pins to control the relays, which in turn switch the LED bulbs on and off. The PZEM004T is connected to the ESP32 for communication and to a current sensor for monitoring power consumption of the connected load through the relay contacts.

Open Project in Cirkit Designer

ESP32 and W5500 Ethernet Module-Based Smart Weather Station with Battery-Powered Motor

This circuit integrates an ESP32 microcontroller with various sensors and an Ethernet module for data acquisition and network communication. It includes a DHT22 and SHTC3 sensor for environmental monitoring, a ZMPT101B for voltage measurement, and a 12V geared motor controlled by a 12V battery. The ESP32 handles sensor data and communicates via the W5500 Ethernet module.

Open Project in Cirkit Designer

ESP32 and W5500 Ethernet Module Based Smart Energy Monitor

This circuit features an ESP32 microcontroller interfaced with a W5500 Ethernet module for network connectivity and a ZMPT101B module for AC voltage sensing. Additionally, a DHT22 sensor is connected to the ESP32 for measuring temperature and humidity. The ESP32 manages data acquisition from the sensors and communication over Ethernet.

Open Project in Cirkit Designer

Common Applications and Use Cases

• Smart home automation systems
• Industrial IoT (IIoT) devices
• Remote environmental monitoring
• Networked sensors and actuators
• Smart lighting and energy management
• Security and surveillance systems

Technical Specifications

Below are the key technical details of the ESP32 T-Internet-PoE:

Pin Configuration and Descriptions

The ESP32 T-Internet-PoE features a variety of pins for interfacing with peripherals. Below is the pinout description:

Usage Instructions

How to Use the ESP32 T-Internet-PoE in a Circuit

1. Powering the Board:

   • Connect the board to a PoE-enabled Ethernet switch or injector to provide both power and data.
   • Alternatively, power the board via the USB-C port using a 5V power source.

2. Connecting Peripherals:

   • Use the GPIO pins to connect sensors, actuators, or other peripherals.
   • Ensure that the logic level of connected devices is 3.3V to avoid damaging the board.

3. Programming the Board:

   • The ESP32 T-Internet-PoE can be programmed using the Arduino IDE, PlatformIO, or the ESP-IDF framework.
   • Connect the board to your computer via USB-C and select the appropriate COM port in your development environment.

4. Ethernet Configuration:

   • To use the Ethernet functionality, connect the board to a network using an Ethernet cable.
   • Configure the Ethernet settings in your code (e.g., static IP or DHCP).

Important Considerations and Best Practices

• PoE Compatibility: Ensure that your Ethernet switch or injector supports IEEE 802.3af PoE standard.
• Voltage Levels: Avoid applying voltages higher than 3.3V to the GPIO pins.
• Heat Management: If the board operates in high-temperature environments, consider adding a heatsink for better thermal performance.
• Firmware Updates: Regularly update the firmware to ensure compatibility with the latest features and security patches.

Example Code for Arduino IDE

Below is an example of how to configure the ESP32 T-Internet-PoE for basic Ethernet communication:

#include <ETH.h> // Include the Ethernet library for ESP32

// Define Ethernet configuration
#define ETH_CLK_MODE ETH_CLOCK_GPIO17_OUT // Set clock mode
#define ETH_PHY_POWER 12                  // GPIO pin for PHY power

// Callback function for Ethernet events
void WiFiEvent(WiFiEvent_t event) {
  switch (event) {
    case SYSTEM_EVENT_ETH_CONNECTED:
      Serial.println("Ethernet connected");
      break;
    case SYSTEM_EVENT_ETH_DISCONNECTED:
      Serial.println("Ethernet disconnected");
      break;
    case SYSTEM_EVENT_ETH_GOT_IP:
      Serial.print("IP Address: ");
      Serial.println(ETH.localIP());
      break;
    default:
      break;
  }
}

void setup() {
  Serial.begin(115200); // Initialize serial communication
  WiFi.onEvent(WiFiEvent); // Register Ethernet event callback

  // Start Ethernet
  ETH.begin(ETH_PHY_ADDR, ETH_PHY_POWER, ETH_CLK_MODE, ETH_PHY_TYPE);
  Serial.println("Ethernet initialized");
}

void loop() {
  // Main loop does nothing; Ethernet events are handled in the callback
}

Troubleshooting and FAQs

Common Issues and Solutions

1. Board Not Powering On:

   • Ensure that the PoE switch or injector is IEEE 802.3af compliant.
   • If using USB-C, verify that the power source provides at least 5V/1A.

2. Ethernet Not Working:

   • Check the Ethernet cable for damage or improper connection.
   • Verify that the network settings (e.g., IP address, subnet mask) are correctly configured in your code.

3. Wi-Fi or Bluetooth Not Connecting:

   • Ensure that the correct SSID and password are used for Wi-Fi.
   • Check for interference or weak signal strength in the deployment area.

4. GPIO Pins Not Responding:

   • Confirm that the pins are correctly configured in your code.
   • Avoid exceeding the 3.3V logic level on GPIO pins.

FAQs

Q: Can I use the ESP32 T-Internet-PoE without PoE?
A: Yes, the board can be powered via the USB-C port using a 5V power source.

Q: Does the board support over-the-air (OTA) updates?
A: Yes, the ESP32 supports OTA updates, which can be implemented using the Arduino IDE or ESP-IDF.

Q: What is the maximum current output of the GPIO pins?
A: Each GPIO pin can source or sink up to 12mA. For higher currents, use external drivers or transistors.

Q: Can I use the board in outdoor environments?
A: The board is not weatherproof. For outdoor use, enclose it in a weather-resistant case.