Duty cycle - Another Math dilemma

[HenrikOlsson]

Hi Ed,
Is the dutycycle at various temperatures repeatable? I mean, you say that 0° at 72F is 4993 and 0° at 65F it's xxxx, are those numbers repeatable from time to time or is 4993 one time and 5006 another?
If they are repeatable then all you need is a temperature sensor (which I suspect you have anyway) and a bit of more math....

Mount the tempsensor in very close proximity to the accelerometer, set the accelerometer exactly level and leave it there. Then, using a hairdryer or whatever measure and plot the dutycycle vs temperature over the range you expect to use it and see what comes out. If you're lucky you'll get a linear realationship between temp and dutycycle which is very easy to compensate for in software. If it's not a linear relationship that too can be compensated for - not as easily though.

If you're very amibitious repeat the test at 30° tilt and see if the relationship is the same.

/Henrik.

[Ramius]

Hi Henrik!
Just an update, it turned out I had a bad sensor! Got a new one and it seems to work fine!