How Does the Eva Wall-Box PoE Sensor Split W5500 Ethernet Across Two Boards?
Alexey Titov's Eva node fits a wall box by splitting in two: sensors and a W5500 on the front PCB, RJ45 and a PoE module on the back.
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Components
Hardware components
WIZnet - W5500
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U1 on the front PCB, LQFP-48, listed in the published BOM as WIZNET W5500 (LCSC C32843). Driven over SPI by the ESP32-S3 through the ESPHome ethernet component; TXP/TXN/RXP/RXN cross a board-to-board
Project description
A Room Sensor That Hides in the Wall and Runs on One Cable Alexey Titov is a developer in Moscow who publishes ESPHome and Home Assistant work on GitHub and writes it up on habr. In September 2024 he published a board he had designed himself, and he opened the write-up with a sentence worth repeating: he is not an expert in circuit design or PCB development, and this was his first attempt at either. What came out is a room environment sensor that mounts inside a standard 86 mm wall box, takes its power and its network from a single Ethernet run, and reports to Home Assistant. A WIZnet W5500…
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