WT32-ETH01 Serial to Ethernet Module (ESP32 Based)

Product Overview

The Integrated WT32-ETH01 is a compact serial-to-Ethernet (UART to 10/100 Mbps Ethernet) module built on the Espressif ESP32-WROOM-32 platform. It pairs a full dual-core ESP32 SoC – Wi-Fi, Bluetooth and plenty of GPIO – with an onboard LAN8720A 10/100M PHY and an RJ45 socket, so almost any legacy serial device can be connected to a TCP/IP network in minutes without writing a single line of Ethernet driver code. The module runs on the standard Arduino / ESP-IDF toolchain and supports transparent serial pass-through (TCP Server / TCP Client / UDP), MQTT, HTTP and Modbus TCP, which makes it an ideal drop-in network engine for industrial meters, sensors, PLCs, access control and smart-home gateways. This listing is the Domestic Version / Unsoldered configuration. Model: WT32-ETH01 Version: Domestic Version Assembly: Unsoldered Net Weight: 14 g

Technical Specifications

• Main Chip: ESP32-WROOM-32, dual-core Xtensa LX6 up to 240 MHz
• Embedded Flash: 4 MB SPI Flash | SRAM: 520 KB
• Wi-Fi: 802.11 b/g/n, 2.4 GHz, up to 150 Mbps (STA / AP / STA+AP)
• Bluetooth: Bluetooth 4.2 BR/EDR + BLE
• Ethernet: 10/100 Mbps auto-negotiation, LAN8720A PHY + RJ45 with integrated magnetics
• Serial Port: 2 x TTL UART (3.3 V level), 1200 – 921600 bps configurable
• Network Protocols: TCP Server / TCP Client / UDP, MQTT, HTTP Client, Modbus TCP, IPv4
• Operating Voltage: 3.3 V – 5 V DC (5 V recommended, onboard LDO regulator)
• Working Current: approx. 150 mA @ 5 V (peak during Wi-Fi transmission)
• Antenna: onboard PCB antenna plus IPEX / U.FL connector for an external 2.4 GHz antenna
• Configuration: web page, AT command, serial or wireless firmware upgrade
• Operating Temperature: -40 °C to +85 °C
• Board Dimensions: 60.5 x 25.5 x 5 mm (L x W x H, including RJ45 socket)
• Assembly: pin headers unsoldered, shipped loose for flexible mounting

Typical Application Scenarios

• Serial-to-Ethernet gateway for PLCs, industrial meters and data loggers
• Modbus RTU to Modbus TCP protocol conversion
• Smart home and building automation controllers (lighting, HVAC, energy monitoring)
• IoT sensor nodes and edge gateways that need a wired uplink instead of Wi-Fi
• Access control terminals, attendance machines and POS peripherals networking
• Remote monitoring and data acquisition in labs, greenhouses and factory floors
• Upgrading existing RS232 / RS485 equipment to network-enabled products

Packing List

• 1 x WT32-ETH01 serial-to-Ethernet module, pin headers not soldered (Domestic Version / Unsoldered)
• 2 x 2.54 mm straight pin headers (loose, solder-it-yourself)
• 1 x Antistatic protective bag

Configuration Comparison

Configuration	ESP32 Module Source	Assembly	Best For
WT32-ETH01 – Domestic Version, Unsoldered	Domestic version	Unsoldered	Volume projects with tight budgets, reflow / embedded soldering
WT32-ETH01 – Original Version, Unsoldered	Original version	Unsoldered	Long-life industrial products that must use original Espressif parts
WT32-ETH01 – Domestic Version, Soldered	Domestic version	Soldered	Fast, economical prototyping and breadboard use
WT32-ETH01 – Original Version, Soldered	Original version	Soldered	Plug-and-play evaluation and industrial-grade prototyping

Domestic Version uses a domestically sourced ESP32 module and PHY of the same grade: identical pinout, identical firmware binary, economical – recommended where budget matters more than certified component traceability. Original Version uses the genuine Espressif ESP32-WROOM-32 module with original-grade LAN8720A, tighter RF performance and test margins – recommended for certified products and long-term industrial supply. Soldered vs Unsoldered only affects whether the 2.54 mm pin headers are already attached; the PCB, firmware and performance are identical.

Frequently Asked Questions (FAQ)

1. What is the difference between the Original Version and the Domestic Version? The Original Version uses the genuine Espressif ESP32-WROOM-32 module and original-grade LAN8720A PHY, while the Domestic Version uses same-specification domestically sourced parts. The pinout, dimensions and firmware are fully compatible, so the same code runs on both.
2. Should I choose Soldered or Unsoldered? Choose Soldered if you want to plug the module straight into a breadboard or backplane the moment it arrives. Choose Unsoldered if you will solder wires directly, mount the board inside an enclosure, or use your own header height.
3. Which power supply do I need? A regulated 5 V supply capable of at least 500 mA is recommended (typical working current is about 150 mA). 3.3 V can also be used on the 3V3 pin, but the onboard regulator is bypassed then, so the supply must be well filtered.
4. How do I program the module? Connect a USB-to-TTL adapter (3.3 V level) to TX, RX and GND, pull IO0 low and reset to enter download mode, then flash with the Arduino IDE (board: ESP32 Dev Module) or ESP-IDF. Remember to release IO0 and reset again to run the firmware.
5. Do I need an external antenna? No. The onboard PCB antenna is sufficient in open environments. Use the IPEX / U.FL connector with a 2.4 GHz antenna when the module sits inside a metal enclosure or when extra range is required.
6. Can it work purely as an Ethernet device without Wi-Fi? Yes. The Wi-Fi / Bluetooth radio can be disabled in firmware and the module will operate as a plain 10/100 Mbps Ethernet device, which is useful in interference-sensitive environments.
7. Does the RJ45 socket support PoE? The standard WT32-ETH01 does not include PoE circuitry. Power the board through the 5 V / GND pins and use a separate passive PoE splitter if needed.

Technical Resources

• ESP32 ESP-IDF Programming Guide (Espressif)
• WT32-ETH01 High-Resolution Pinout Diagram
• WT32-ETH01 Serial-to-Ethernet User Guide (PDF)