CODEWITHSUNDEEP
arduinoaccelerometer
Mahesh
Mahesh

Reputation: 31

Accelerometer tilt error correction

I am using arduino and accelerometer MMA7341 to measure the acceleration in x direction of an oscillating metal table. But the mounting of the accelerometer is tilted by a small angle (say Q) . Is it affect the acceleration?. If it is affect the acceleration in x direction , how can correct it without changing the tilt of the acceleration sensor.

Upvotes: 1

Views: 946

Answers (2)

Julie in Austin
Julie in Austin

Reputation: 1003

"Tilt" and "acceleration" are both the same, from the perspective of most sensors, since both measure a force, rather than an actual angle (tilt) or change in velocity (acceleration).

What you should do is make sure the object on which the sensor is mounted is "level", within the best of your ability to determine such a thing, and use the values from analogRead() or whatever else your device provides, as the "0" values.

For the MMA7341 you'll also need to calibrate your analog signals, or else use a high precision reference as input to the Aref pin, assuming you're Arduino exposes that pin.

Upvotes: 1

devshorts
devshorts

Reputation: 8872

I think this depends on what you are measuring. THe MMA7341 looks to be able to be used for acceleration as well as tilt. If you are measuring acceleration then the mounting position doesn't matter since acceleration is a change of velocity and the velocity delta will be constant regardless of orientation.

If you are measuring tilt then thats obviously different. You could theoretically measure the initial tilt and then compensate for that in your code if you wanted to of course.

Upvotes: 0

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