WT32-ETH01

Overview

The WT32-ETH01 by Wireless-Tag is an ESP32-based module with integrated Ethernet connectivity via a LAN8720A PHY. It bridges the gap between WiFi-only ESP32 boards and the need for reliable wired networking in IoT deployments, making it a popular choice for gateways, industrial controllers, and home automation nodes.

Key Features

• Built-in Ethernet — LAN8720A 10/100 Mbps PHY for rock-solid wired connectivity
• ESP32 dual-core — 240 MHz Xtensa LX6 processor with WiFi 802.11 b/g/n and Bluetooth 4.2
• Dual networking — simultaneous Ethernet + WiFi operation for bridging or failover scenarios
• 4MB flash + 520KB SRAM — sufficient for most IoT firmware
• Compact module — small form factor suitable for embedded integration
• Wide voltage input — 3.3V to 5V power supply support

Specifications

Spec	Value
MCU	ESP32 (Xtensa dual-core LX6, 240 MHz)
Flash	4 MB
SRAM	520 KB
Ethernet	LAN8720A 10/100 Mbps
WiFi	802.11 b/g/n
Bluetooth	4.2 (BLE + Classic)
GPIO	12 available (others used by Ethernet PHY)
Operating Voltage	3.3V
Power	5V via pin header

Common Applications

• IoT gateways — bridge WiFi/BLE sensors to a wired Ethernet backbone
• Industrial IoT — reliable wired connectivity for factory automation and monitoring
• Home automation — ESPHome or Tasmota node with stable wired connection
• Ethernet-WiFi bridge — extend WiFi networks or create access points with wired uplink
• Data logging — collect sensor data and push to servers over reliable Ethernet

Getting Started

The WT32-ETH01 requires an external USB-to-serial adapter for programming (no onboard USB). It is well-supported by ESPHome (with built-in Ethernet component), Arduino IDE, ESP-IDF, and Tasmota. When using ESPHome, select the wt32-eth01 board type for automatic pin configuration.

Notes

• No onboard USB — use an FTDI or CH340 adapter for flashing (TX0, RX0, IO0 for boot mode)
• The Ethernet PHY uses several GPIOs (GPIO16, GPIO17, GPIO18, GPIO19, GPIO21, GPIO22, GPIO23) — avoid conflicts when assigning pins
• Some versions ship with or without pin headers — check the variant when ordering
• Power via 5V pin or 3.3V — onboard regulator handles conversion