I added a HC-05 bluetooth module to one of my POV boards. The bluetooth module needs 3.3 V, so I used a step up power supply which outputs that.
I wrote a simple Android app "Blinken Edit" to draw patterns for the POV board. The patterns can be saved and load. And can be flashed over bluetooth to the POV board. The patterns are stored in the PIC microcontroller data EEPROM (128 bytes on PIC 16F628A).
Here is the board with the upper black iso tape removed, to show the bluetooth module: