This is my very first Arduino project.
Thanks to Hans Meijdam on this site for the design, guidance and assistance:
http://www.modelbouwforum.nl/threads...-vario.199904/
The only problem I encountered along the way was Linux Mint permission problems. Once I got around them, all went according to the instructions.
I have encountered "Permission Denied" problems before in my otherwise excellent Linux Mint 17.3 operating system. Don't ask!.............
It is amazingly sensitive and sounds like a full size sailplane vario.