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How to Build a Deterministic eBUS Ethernet Adapter with W5500 on PIC16F15356?

This project implements a deterministic PIC16F15356 firmware scaffold for a Helianthus eBUS adapter, using the WIZnet W5500 as the Ethernet transport

viktor

Published April 02, 2026

Original author: Project-HelianthusOriginal source (new tab)

How to Build a Deterministic eBUS Ethernet Adapter with W5500 on PIC16F15356?

Project description

Summary This project implements a deterministic PIC16F15356 firmware scaffold for a Helianthus eBUS adapter, using the WIZnet W5500 as the Ethernet transport path for the adapter’s TCP connection. The PIC firmware handles adapter framing, bus-byte forwarding, scan/status behavior, and host communication, while the W5500 provides the wired Ethernet socket layer that keeps TCP/IP handling outside the small 8-bit MCU runtime. About the author Project Helianthus is an open HVAC (Heating, Ventilation and Air Conditioning) gateway platform built around a protocol-agnostic semantic core. Its…

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