Using seatsurfing and Tinta door signs for some time in real life now, one thing that happens quite often to me is that I forget to book. So, it would be nice to be able to book arriving at the office using Tinta directly, instead of having to go to the homepage. 

The solution: Using the concept from my NFC2026 Green Power Challenge project https://hackaday.com/2026/04/20/2026-green-power-challenge-nfc-powers-command-write-and-wake-of-mcu/ I now can book by tapping my cell phone to the door sign, and the corresponding seat is booked in our seatsurfing instance https://seatsurfing.io/. 

Tap your phone on Tinta to book a desk — the Android app writes your booking request via NFC into the ST25DV chip, which harvests just enough RF energy from your phone to wake the sleeping microcontroller, create the booking on the seatsurfing server over WiFi, and refresh the ePaper display with the updated information.

I also played around with some other stuff one could do with that: