Automate humidity sensor and fan

Sure. They’re in Dutch, ask if something is not clear enough. The flow have been created with the Web app (my.athom.com), screens come from preview Android app.

The triggers (when) are based on humidity changes of the bathroom Xiaomi sensor.
The conditions (and) use a Homey logic card to compare the bathroom humidity (dragged from trigger card) with the humidity from my study (dragged from tags dropdown above in flow editor) and using inline calculations with double accolades. The second condition might differ for you, I’m using a three position controlled central ventilation system).
The action (then) triggers another low that simply changes the ventilation setting. Thus way can reuse it and invite some night specific lower ventilation to reduce noise / power consumption.

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