I am going on a little vacation during 4 days. I know 4 days are few days, and that my plants could be without supervision (I suspect nothing would have happened to the vandas either if they spent 4 days without watering) but I consider this practice for the future winter holidays (2 weeks).
I prepared my vandas this way, with a microfiber wick (cut from a mop) linking them to a bowl of water (the Vanda denisoniana on the left had very long roots, so I placed the tips of a branch in the water, no microfiber):
Then with the inestimable help of my techie boyfriend, we made this small surveillance device with a Raspberry Pi 0W and a camera:
The plants are strategically placed so I can see the water gauges of the self-watering pots and the temp/RH sensor (you probably can't see that last one in the pic because the sun was hitting it at the moment I took the picture):
Thoughts? Constructive criticism? Any more ideas?