Overview

A Look Inside Your CPAP Machine

I've been diagnosed with sleep apnea, and after the first month or so, I went back to the doctors for a follow-up appointment. They asked me to bring along the ResMed CPAP machine, and the nurse showed me charts and information that they had gotten from the machine. Hmmm. How does that work?

I found that the machine has an SD card, and since I have an SD card reader on my iMac, I took it to the office to have a look around. Looking at the disk, I found this directory structure.

The SETTINGS folder has a bunch of files in it

Not sure what these things are, so I moved on and in the DATALOG directory, I found...

Each session of using the machine creates a folder of a number of related files, and in searching the internet I found that the .edf files are 'European Data Format' and you can find an open source browser at

www.teuniz.net/edfbrowser

Where you can find extensive information on the file formats, an EDFBrowser program that runs Linux and Windows. The programmer behind this is Teunis van Beelen, a Dutch electronics hardware designer who now lives and works in Turin, Italy. He's strictly a Linux user, and he says the Windows version of EDFBrowser was compiled on an old Windows XP machine installed within VirtualBox. Apparently you can compile the program on a Mac, but it looked too difficult for me, so I created a Mac Cocoa app following the design I've used for importing ShapeFiles in WildTools. The program has a window into which you can drag multiple .edf files.

 

      

 

Dragon Breath