After a few months of work, planning, learning to love KiCad and the intensely joyful experience of logistics concerning infrastructure in an office building, the first controller nodes will be installed soon. So far one signal wire has been connected to an AC unit (Sabiana SkyStar-ECM), with the following exciting result:

Thrilling, right? :)

Also interesting is a comparison with the old (wall-mounted) units that these new units are replacing:

Old unit is on the left. Obviously.

In this image the WiFi AC controller unit is controlling the AC unit in the same room, using the wiring the old unit normally connects to. Of note is that the old unit has two outputs (switchable between PWM/analogue) for driving a maximum of two AC units (or multiple chained, as happens in the main room of the office). The new unit can drive four AC units directly.

During this and next week the last wiring will be installed and the six boards that were assembled so far tested and validated before being put up into their position on the ceiling. Fingers crossed :)