Controlling my central ventilation system with a three status switch

[Frans Erich]

Hi community,

At home we have a central ventilation system with a three status switch (off, first speed and second speed).
I wonder would it be possible to switch this system using the web interface using Omega2 in combination with Wifi and the relay expantion board? The trick is how to switch the first relay on and the second off and vice versa but preventing them from ever being switched on simultaneously.

Did someone already do this?

Or even better did some already trigger this kind of switch using a second wifi connected Omega2 with a humidity sensor in their shower?

I would highly appreciate If you could share your project information, advice and thoughts on this subject.

Regards,

Frans