MMA8451Q

[naifarmourad]

hello,

I have a problem and I need your help

I want to calculate the speed through the accelerometer sensor of freescale KL46Z and I want to save it to an excel file

I want a clear expliquation about the CodeWarrior and C code for this program

thank you.

[reyes]

Hi naifar mourad,

In theory it is possible to calculate speed of an object using an accelerometer sensor.

If the acceleration of an object is known, we can get a proportional approximation of the speed data if an integration is applied.

Unfortunately we do not have any updated document with information about how to do this with the MMA8451Q/KL46Z, however, we do have an application note that mentions how to calculate velocity/speed (and positioning) using the accelerometer MMA7260 (which is no longer manufactured), but you can use this document as a reference to create your own code.

Application note: AN3397 “Implementing Positioning Algorithms Using Accelerometers”

You can also use the bare metal example project of the MMA8451Q that can be found in Freescale communities: https://community.freescale.com/docs/DOC-98836

I hope this helps.

Have a great day,
Jose Reyes

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