I gave it a try myself, using Wise Clock 4 with Bluetooth and two 3216 displays, as shown in this photo (the blue LED on the BTBee is power, the orange one is communication status).
The code is a modified version of the one posted here.
This message sign, especially if it is made with the larger (5mm) 3216 displays, can be also used in waiting rooms, call centers, stores etc, to show dynamic and easily-changeable messages.
- Scrolling message sign display with Wise Clock 3/4
- Scrolling large-font message sign display with Wise Clock 3/4