LED Matrix Clock extension - Bluetooth module

Short video which shows Bluetooth module application in LED Matrix clock project - sending scrolling messages to the clock via Bluetooth module + simple Android app
First part and the link to the source code is here:    • Arduino and MAX7219 LED Matrix clock ...  

It is not shown in the video but finally I've added much more features to this project:
- audio capability with simple 1 transistor amp and toy speaker
- alarm programming with black hours and dates
- chime beep (every hour during daytime)
- important dates and birthdays reminder (visual + audio)
- sampled audio playback (up to max capacity of internal flash memory)
- RTTTL (Nokia ringtones) support for alarm sounds/reminders/etc.
- sending scrolling messages to LED Matrix display via via Bluetooth module + Android app with support for Polish characters and special signs
- time/date/alarm setting via Bluetooth module + Android app
- added thermistor from old laptop battery to measure the temperature more acurately