As I mentioned in a previous post, "BasementDwellingGeek" at cpapTalk.com talked about an accelerometer for measuring movements during sleep, breathing, sleeping positions and I suppose numerous other things. My interest is in sleeping positions. It is the Gulf Coast X16-1C Accelerometer for $89, plus shipping.
When I received it this is what I found in the box...
The accelerometer's case is just right. Rounded corners, no wires dangling, no connectors and a nice cap over the USB connector. It's 3-4 inches long and probably less than 1" wide and deep.
Since I was interested in sleeping positions, I needed a way to attach this to me. I had some velcro straps I was not using so I rubberbanded the accelerometer in the velcro and then attached it to my CPAP mask headgear, which is velcro-friendly, that's the way you adjust the straps on the headgear.
This device is configurable by adding/changing/removing configuration settings in a text file to customize how often it records values, the number of readings per text (CSV) file it puts on its RAM drive, numerous others. You have to use WordPad in Windows to do this, not Notepad (so they say). Something about proper line terminations (Carriage Return Line Feed stuff).
The nice thing about this unit is that it senses and records gravitational G's. That means it's recording positions, not just movement. If you have it at different orientations, it's recording different G's on it's X, Y, and Z axes thus different X, Y, and Z values. So, if I strap it to my body / head and rotate my head, or roll from my tummy to my back when sleeping, there will be levels of X, Y, Z that correlate to those positions. Perfect!
Surprise Bonus... Temperature
Come to find out when this unit writes files it records the temperature for each file following the hour change. Who knew! Great! Now I can have my sleeping temperature too! Perfecto!
More later on the XYZ and sleeping position with some graphs...