DIY home automation that
runs in the walls.
ESP32 main board, modular relay boxes, and standard RJ45 patch cables. Plug, label, save. Home Assistant does the rest.
Hardware
ESP32 main board with 6 RJ45 ports; 2- or 4-channel relay modules in printed enclosures. GX12 mains connector. Push-rivet assembly.
Firmware
ESPHome templates per device. Strapping-pin safe defaults. PZEM, DS18B20, covers, cistern orchestration — already supported.
Home Assistant
Visual configurator add-on that writes the YAML for you. Live entity status, surgical edits, diff/undo, git history per file.
Hardware
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Main board v1.1
ESP32 brain with 6 RJ45 ports.
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Relay module — 2 channels (v2)
Two SRD-05VDC relays, GX12 output.
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Relay module — 4 channels (v2)
Four relays, two RJ45 pairs, two GX12 outputs.
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Wall bracket
Screw-mount with universal T-slot.
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DIN-rail bracket
DIN-35 clip with the same T-slot.
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Why a custom RJ45 pinout?
Every cable carries four digital I/O lines and full power rails (3.3 V, 5 V, two GND returns). One patch cable connects a relay module — power and signal, no breadboard, no solder. It looks like ethernet, but it isn't — never plug it into a switch.
See the pinout table →| 1 | white/orange | 3.3 V → |
| 2 | orange | 5 V → |
| 3 | white/green | GND → |
| 4 | blue | GND |
| 5 | white/blue | ← I/O 4 → |
| 6 | green | ← I/O 3 → |
| 7 | white/brown | ← I/O 2 → |
| 8 | brown | ← I/O 1 → |