Thread Tools
Dec 11, 2019, 10:00 PM
Registered User
Thread OP

Questions about acceleration sensor to judge free fall

Questions about acceleration sensor to judge free fall

Everyone, we have a product (not a quadcopter, it is a rod-shaped object.

The product has a built-in BMA255 acceleration sensor for judging free fall. The current judgment method is written in the datasheet: when the acceleration values measured in the three axis directions of xyz are less than a certain threshold, it is judged as free fall.

But now there is a problem. When this stick is rotating for free fall (as shown in the figure below), the acceleration values on the three axes do not meet the above free fall conditions, so this scenario cannot be determined.

Would you like to ask the great gods, how should you judge this posture of rotating and falling freely?

Thank you very much!

Sign up now
to remove ads between posts
Dec 13, 2019, 10:50 PM
Oldgazer's Avatar
And what exactly does this have to do with multirotor power systems? NOTHING, that 's what.

Your post does not belong here.
Dec 13, 2019, 11:35 PM
Wake up, feel pulse, be happy!
Piece's Avatar
The diagram is top-notch.

You could add a gyro on each axis to gauge rate of spin, then use that information to adjust your acceleration data appropriately.

Otherwise, add fins to your cylinder so it falls in consistent orientation, then sample accleration off the vertical axis only.
Latest blog entry: Jeti ESC resto-mod
Dec 14, 2019, 01:41 AM
Are we not men? We are DEVO!
xanuser's Avatar
so to sum it all up.

Zombie Kid Likes Turtles (0 min 17 sec)

Quick Reply

Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion Question about Temperature sensors BlinkguY Engines 11 Mar 28, 2018 07:45 AM
Question Newbie questions about sensored brushless motors. andzerb Power Systems 5 Aug 26, 2017 04:08 PM
Discussion Federal Judge Absolutely Skewers DOJ Lawyers For ‘Lying’ About Obama’s Immigration Di kenpoprofessor Life, The Universe, and Politics 2 May 20, 2016 12:34 PM
Discussion Question about pack falling on it's face, low voltage, etc Dan_K Batteries and Chargers 12 Feb 27, 2009 11:43 AM
If anyone is curious, there's about to be a case on Judge Joe Brown about RC planes AUBrian Electric Plane Talk 5 Jul 09, 2004 11:17 PM