Sensitive aqua sensor

Hi, i have a problem with my outdoor blinds. They have to close when it’s raining. Netatmo rain gauge gives a signal when it is raining quite a while. So my blinds are wet when closing. Using a weather application gives also a signal after it is raining a while. Would a flood sensor work, or will this also give a signal when much water reaches the sensor. Any ideas would be welcome.

You can try the “buienradar” app it can give you a trigger even before it starts raining.
That will keep everything dry.