Hi everyone! I'd like to share DOMIX, a modular DIY home automation system I've been developing and publishing as open-source hardware.
What is DOMIX? DOMIX is a family of custom PCBs designed to cover the most common home automation needs — environmental sensing, energy monitoring, contact inputs, irrigation control, and more — all integrated with ESPHome + Home Assistant via MQTT.
Core architecture Each module runs on ESP32-S3 (or RP2040 for Ethernet-based nodes) and communicates over a shared 8-pole IDC bus with a symmetric pinout. Nodes can use Wi-Fi or wired Ethernet (W5500) for reliability-critical installations.
Resources
GitHub: carletz (Carletz) · GitHub
YouTube: carletz
OSHWLab + Hackster.io: search carletz
Happy to discuss the ESPHome YAML design, custom components (ATtiny1616 I²C, display, AC dimmer), or anything else. Feedback welcome!