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Motion of what? Assuming it is within reasonable parameters, have you considered using a smart phone? They have accelerometers, a dsiplay, data storeage, rechargable batteries, a GPS (there is even a phone in there somewhere
There are many cheap 3 axis accelerometers available on eBay. Search for "Arduino accelerometer" for a quick list of some that are available.
I suppose it depends on what you want to know, gyros measure angular rotation, there are 3 axis gyro modules available. Inertial guidence systems use both gyros and accelerometers to get a fuller picture of how a vehicle is moving.
An accelerometer will not be able to distinguish between forces due to rotation and other forces e.g. the car rocking from side-to-side whilst going over bumps.
An accelerometer will not be able to distinguish between forces due to rotation and other forces e.g. the car rocking from side-to-side whilst going over bumps.
Why would GPS/Compass be better than gyros? If you look at all the DIY Drone type boards they implement at least accelerometers and gyros, and add compass and GPS for navigation - which is different to aircraft attitude.