JacopoMTK

Just ordered 5 of everything you said in the post

Thanks a lot for the tips!

Thanks a lot,i'm gonna power the ND trough the 5v pin then.

it will save me a tons of problems .

 

Thanks for the tip on the LM7805,i'm defenitely going to buy some with the next order!

Ok...let's say i'm using one of these power supply board [max current 800mha] connected to a wall adapter.

I could use it to supply both the netduino and the led's.

My question now is:

-Is it safe to power up the netduino trough the 5v pin?

 

I read in many topics that a lot of people do that but i also read one saying that it could be dangerous...what's the official version?

 

Thanks in advance.

With the magnetometer and most other sensors you have to remember you can't simply use it to get a number that will tell you which way your hand it pointing. You need to write your software to measure the delta (change) and that is how you know the rotation.

If you stick with the HMC5883L Compass there is code available. I can send you the class I am using too. This will save you a ton of work.

Sorry for the late reply,again i didn't get the notification :\
Anyway,tomorrow i'll make an order to get some components but it seems that the shop ran
out of HMC5883L so i'll have to make another order for it at the end of january.

Thanks for the code offer!I'll try to work it out by myself at first but
in case i'll appreciate it.

Thanks.

Hi,thanks to everyone for the links and explanations.
Currently i got the angles from the accelerometer using this code.X and Y rotation are accurate but the Z value keep changing with a range of 40 degrees :\ (even using multiple readings to get an average value).
Today i'll try again to get a more stable value on Z axis.

Anyway,unfortunately the IMU boards are way too expensive for me,but i was thinking to the magnetometer only since the price is similar to the accelerometer i got.
I will not be able to get the acceleration from it directly but i think i should be able to get some clues about it.
For example if at time T1 the rotation in 20 degrees and at the second reading at time T2 the rotation is 30 degrees,i should be able to tell
how fast the magnetometer is rotation doing 30-20/(t2-t1).

[quote name='"Dave VanderWekke"]It's basically a compass and measures it's location based on the earths magnetic field and it can calculate Roll' date=' Pitch and Yaw. [/quote']

But,i really don't understand what magnetometer gives as result,i mean reading some articles,it seems it gives as result the megnetic strength based on his position not a x,y,z rotation.

Thanks.