[ei23]

A battery powered doorlock (pretty proud of that) https://www.youtube.com/watch?v=4-wtu9toda0

A video doorbell with display and fingerprint reader: https://www.youtube.com/watch?v=3w_xTNuditQ

Also smart meter readers, BLE Trackers... I just love it!

[ei23]

Also forgot: Synchronized multiroom speakers with squeezelite and LMS https://www.youtube.com/watch?v=DwotxrCvHTA