I am glad that you are interested.
Tutorial video is available : https://osdn.net/projects/acce-soft/wiki/FrontPage/attach/AbilityTimerV0_42demo.mp4
"AbilityTimer" is open source (MIT License).
It is created using Processing https://processing.org/ .
It's sourcecode is distributed in my site. https://ashidan.myhome.cx/gitbucket/root/accessory_repo
You can run or build sourcecode with Processing environment.
However, since I want to see the count of downloads going up, I'd like you to download it if possible.