--- title: "Interfacing ESP32 with W5500 discussion on Arduino Forum" url: "https://maker.wiznet.io/jakelee/projects/interfacing-esp32-with-w5500-discussion-on-arduino-forum/" markdown_url: "https://maker.wiznet.io/jakelee/projects/interfacing-esp32-with-w5500-discussion-on-arduino-forum/md" type: "UCC: User Created Content" author: "bdpak" author_url: "https://forum.arduino.cc/t/interfacing-esp32-with-w5500-ethernet-module/1363018" editor: "WIZnet" editor_url: "https://maker.wiznet.io/" original_author: "bdpak" original_url: "https://forum.arduino.cc/t/interfacing-esp32-with-w5500-ethernet-module/1363018" published: "2025-08-13" language: "en" hardware: ["Espressif ESP32", "WIZnet W5500"] likes: 0 views: 4675 comments: 0 source: "WIZnet Makers (https://maker.wiznet.io/)" --- # Interfacing ESP32 with W5500 discussion on Arduino Forum > Trying to connect ESP32 to W5500 for an Ethernet web server using the Arduino IDE and the AsyncWebServer_ESP32_W5500 library (based on ESPAsyncWebServer) Original author: bdpak (source: https://forum.arduino.cc/t/interfacing-esp32-with-w5500-ethernet-module/1363018) ## Components - **Espressif ESP32** x 1 ([docs](https://www.espressif.com/en/products/socs/esp32)) - **WIZnet W5500** x 1 ([docs](https://docs.wiznet.io/Product/Chip/Ethernet/W5500)) - Software: **Arduino IDE** ([docs](https://www.arduino.cc/en/software)) WIZnet parts: W5500 ([Datasheet](https://docs.wiznet.io/Product/Chip/Ethernet/W5500/datasheet?utm_source=maker&utm_medium=project&utm_campaign=w5500), [product hub](https://maker.wiznet.io/products/w5500/)) ## Article ## Forum Discussion Summary **Context & Goal (bdpak – March 12, 2025):** The user was working on connecting an **ESP32** to a **W5500 Ethernet module** to run an Ethernet web server using the Arduino IDE and the **AsyncWebServer_ESP32_W5500** library (based on ESPAsyncWebServer) [Arduino Forum+1](https://forum.arduino.cc/t/interfacing-esp32-with-w5500-ethernet-module/1363018?utm_source=chatgpt.com). Although the sketch compiled successfully and showed "Ethernet connected" in the serial monitor, the Ethernet connection failed on the PC side—it displayed a "trying to assign address" message without completing the connection [Arduino Forum+1](https://forum.arduino.cc/t/interfacing-esp32-with-w5500-ethernet-module/1363018?utm_source=chatgpt.com). --- ### Troubleshooting Process **Suggested Alternative Library (Juraj):** Juraj recommended using the `EthernetESP32` library with ESP32 web server examples available for simpler setup [Arduino Forum+1](https://forum.arduino.cc/t/interfacing-esp32-with-w5500-ethernet-module/1363018?utm_source=chatgpt.com). **Switch to Official ESP32 Ethernet Example:** The user updated to Arduino ESP32 version 3.1.1 and tried an official Ethernet example (`ETH_W5500_Arduino_SPI.ino`) using the `ETH.h` interface. It initialized the connection (ETH Started → ETH Connected) but repeatedly lost the IP address (ETH Lost IP) [Arduino Forum+1](https://forum.arduino.cc/t/interfacing-esp32-with-w5500-ethernet-module/1363018?utm_source=chatgpt.com). **Static IP Setup on Linux Mint (ledsyn):** It was suggested that the user configure IP addresses correctly—particularly for peer-to-peer setups, setting a compatible static IP on the PC instead of relying on DHCP [Arduino Forum+1](https://forum.arduino.cc/t/interfacing-esp32-with-w5500-ethernet-module/1363018?utm_source=chatgpt.com). **Success with Static IP on Host:** The user successfully assigned a static IP (`192.168.2.232`) to the Linux host. They were able to ping the ESP device, confirming basic network connectivity [Arduino Forum+1](https://forum.arduino.cc/t/interfacing-esp32-with-w5500-ethernet-module/1363018?utm_source=chatgpt.com). **Web Server Not Responding:** Despite successful ping, the web server was still unreachable via telnet (`Connection refused`). Juraj concluded that network setup was functioning, but the sketch did not include HTTP server functionality. The user needed to deploy a web server in code to respond on port 80 [Arduino Forum+1](https://forum.arduino.cc/t/interfacing-esp32-with-w5500-ethernet-module/1363018?utm_source=chatgpt.com). **Pin Wiring Issue Resolved:** After attempting the `HelloServer.ino` example from the `EthernetESP32` repository, the user had wiring issues—particularly with the RST pin and a typo in code (`Setup.begin()` vs `SPI.begin()`). Juraj clarified that the W5500 RST pin should not be wired and pointed out the coding typo [Arduino Forum+1](https://forum.arduino.cc/t/interfacing-esp32-with-w5500-ethernet-module/1363018?utm_source=chatgpt.com). **Library Missing Fix:** The user had forgotten to install the `EthernetESP32` library, resulting in compilation errors. After installing the library, the sketch compiled and uploaded successfully [Arduino Forum+1](https://forum.arduino.cc/t/interfacing-esp32-with-w5500-ethernet-module/1363018?utm_source=chatgpt.com). **DHCP vs Static IP Clarification:** Juraj confirmed that the `HelloServer` example works with static IPs as well, not just DHCP [Arduino Forum+1](https://forum.arduino.cc/t/interfacing-esp32-with-w5500-ethernet-module/1363018?utm_source=chatgpt.com). **Final Success with Router-Based DHCP Setup:** As a final step, the user set up a TP-Link Archer C6 router as a DHCP server. The ESP32 + W5500 module obtained an IP automatically, and the HTTP server came online and worked as expected [Arduino Forum+1](https://forum.arduino.cc/t/interfacing-esp32-with-w5500-ethernet-module/1363018?utm_source=chatgpt.com). --- ## Key Takeaways | Issue Highlighted | Resolution Summary | | --- | --- | | Incomplete network setup | Static IP setup on both host and ESP32 or using a DHCP server | | Web server not responding | Include HTTP server code in the sketch | | Wiring & code errors | Don’t wire RST pin, use `SPI.begin()` instead of typo, add library | | Final success | Achieved Ethernet + web server working via DHCP-configured router | --- Source: https://maker.wiznet.io/jakelee/projects/interfacing-esp32-with-w5500-discussion-on-arduino-forum/