acceleration sensor

[chickenkai]

hi everybody,

I have some question to ask

I use C# to write my own interface to control my rorbobuilder

in my code, I use RobobuilderLib.dll

I want to control acceleration sensor by using the function "readXYZ(out int, out int, out int)" in PCRemote
http://code.google.com/p/robobuildervc/wiki/PCRemote

And now I got one problem, the value I get from the function, what does it means? the gravity?

thank all!

[chickenkai]

the value of x,y,z I got from the function "readXYZ(out int, out int, out int)"

can be more than 50. But acoording to the "actionbuilder manul", the range of

the value is-7~7, so it's confused me

does anyone know why?

thank!

[l3v3rz]

Hi,

I don't know I think it must be a scaling factor. Basically robobuilderlib.dll has no connection with actionbuilder. The official code must convert the values.

My open source library is simply returning the values it reads directly. Not sure if it depends on which firmware you're using I always use my custom firmware as well (DCMP) and I see the +/50 values as well if you have official firmware you may get different values.

cheers

[chickenkai]

so the value I got from robobuilder.dll would be different from the actionbuilder?

which version of firmware do you use?

[chickenkai]

so the value I get from "readxyz" has to be divide by 50? or another number?

[l3v3rz]

yes the values are different. I think the scaling is actually done by action builder.

You can scale by any value you want - why is the absolute value important ?
To know what scaling value to use would probably require the datasheet for IC
I always use values raw - so in Basic I use the following (it uses same libraries)

Look at the section starting "face down"

http://code.google.com/p/robobuilderlib/wiki/Cwalk2

[chickenkai]

thank you so much!

I want to konw the value represents how much g? 1g? 2g?

I need this data to use other formulas to calculate some value

thanks!

[l3v3rz]

Assuming you're on planet earth when the robot is stationary there is 1g downwards so you could use that for scaling.

[chickenkai]

OK! Now I got it!

Thank you very much!