Write a program on your phone.

Requires the services of an Android phone app developer. You need to write an application with a small functionality, like a bicycle computer.
Interaction of the phone with an external cadence sensor using ant+ or Bluetooth smart technology (so far in the search for the sensor and the exact principle of its operation).
The sample menu in the attachment.
Preservation of statistics in the format of:
Time; meaning
Example:
10.70
20.73
30;72
...
Saving the statistics file for the trip with the name gg-mm-dd-ch-mm.csv
The cadence point when pedaling faster or slower than the specified criteria lights up and blinks the corresponding value and an audible signal is emitted. The ability to turn off the sound signal.

The statistics item can not be developed yet, probably there will not be necessary to display information, but just make a semblance of a file manager.
As I wrote the program is needed for a diploma, so screenshots of the development process are needed to the maximum. They should only have a program and should not contain identifying information.