Reference: RBD-2268
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The ESP32-ETH01 Serial to Ethernet Module is a compact and powerful development board designed around the ESP32-WROOM-32 SoC. It acts as a robust bridge between serial UART communication and Ethernet, making it the ideal solution for adding network capabilities to your embedded devices or industrial control systems. With its integrated TCP/IP stack, dual WiFi + Bluetooth support, and optional RS485 interface, this module significantly reduces development time and effort in IoT and smart home applications.
Key Features:
Based on ESP32-WROOM-32 with 2.4GHz WiFi + Bluetooth 4.2 (BR/EDR & BLE)
Supports transparent serial to Ethernet communication
Integrated TCP/IP protocol stack for seamless network communication
Multiple power supply options: 5V or 3.3V (select one at a time)
RJ45 port with 10/100Mbps adaptive Ethernet
UART Baud Rate: 80 to 5000000 bps
OTA support for remote firmware updates
Compact design compatible with half-pad and through-hole soldering
AT+ Command Set for easy configuration
Dual working mode: Station / SoftAP / SoftAP + Station / P2P
Secure communication via WPA/WPA2/Enterprise, AES/RSA/ECC/SHA encryption


Pin | Name | Description |
1 | EN1 | Reserved debugging and burning interface: Enable, high level is effective |
2 | GND | Reserved debugging and burning interface:GND |
3 | 3V3 | Reserved debugging and burning interface:3V3 |
4 | TXD | Reserved debugging and burning interface:IO1,TXD0 |
5 | RXD | Reserved debugging and burning interface:IO3,RXD0 |
6 | IO0 | Reserved debugging and burning interface:IO0 |
Pin | Name | Description |
1 | EN1 | Enable, high level is effective |
2 | CFG | IO32,CFG |
3 | 485_EN | IO33,RS485 Pinout |
4 | RXD | IO5, RXD2 |
5 | TXD | IO17, TXD2 |
6 | GND | GND |
7 | 3V32 | 3V3 power supply |
8 | GND | GND |
9 | 5V2 | 5V power supply |
10 | LINK | Network connection indicator pin |
11 | GND | GND |
12 | 10393 | 1039, only supports input |
13 | 10363 | 1036, only supports input |
14 | 1015 | 1015 |
15 | 1014 | 1014 |
16 | 1012 | 1012 |
17 | 1035 | 1035,only supports input |
18 | 104 | 104 |
19 | 102 | 102 |
20 | GND | GND |
Note 1: The module is enabled high by default.
Note 2: Only one of the 3V3 power supply and 5V power supply can be selected
Note 3: 1039, 1035 and 1036 only support input.
Specifications:
Wireless Communication:
WiFi: 802.11 b/g/n/e/i (up to 150 Mbps)
Bluetooth: v4.2 BR/EDR and BLE
WiFi Security: WPA/WPA2/WPA2-Enterprise/WPS
Encryption: AES, RSA, ECC, SHA
WiFi Frequency Range: 2.4 ~ 2.5GHz
Hardware Interface:
RJ45 Ethernet port: 10/100 Mbps
Serial Baud Rate: 80–5000000
Flash: 32Mbit
Power Supply: 3.3V or 5V (only one should be used at a time)
Working Current: Avg. 80mA
Min. Supply Current: 500mA
Operating Temperature: -40°C to +85°C
Pin Description Highlights:
UART TXD/RXD for serial communication
RS485_EN (IO33) for optional RS485 interface
CFG (IO32) for configuration control
LINK indicator pin
Debug Interface: EN, GND, 3.3V, IO0
Software Support:
Firmware: Built-in TCP Server/Client, UDP Server/Client
IP Configuration: Static IP / DHCP
Upgrade: Supports remote OTA updates
SDK available for custom firmware development
Applications:
Industrial automation
Smart home devices
IoT gateways and nodes
Network-enabled sensor hubs
Serial to Ethernet transparent transmission
Remote device control and monitoring
RS485-to-Ethernet communication modules
Package Includes:
1 x ESP32 Serial Port to Ethernet Module (ESP32-ETH01)
Why Choose This Module?
Whether you're building a cost-effective Ethernet gateway, upgrading legacy serial systems, or developing next-generation IoT solutions, the ESP32-ETH01 offers outstanding performance, seamless integration, and secure networking—all packed into a compact, easy-to-mount module.
Start building your network-enabled embedded system with the ESP32 Serial to Ethernet Module today – your smart IoT infrastructure begins here!
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The ESP32-ETH01 Serial to Ethernet Module is a compact and powerful development board designed around the ESP32-WROOM-32 SoC. It acts as a robust bridge between serial UART communication and Ethernet, making it the ideal solution for adding network capabilities to your embedded devices or industrial control systems. With its integrated TCP/IP stack, dual WiFi + Bluetooth support, and optional RS485 interface, this module significantly reduces development time and effort in IoT and smart home applications.
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