MMA8451 Calibration

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tyler13ates
 
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Joined: Mon Feb 09, 2015 9:01 pm

MMA8451 Calibration

Post by tyler13ates »

Good Evening,

I am utilizing the MMA8451 triple axis accelerometer and I need to know the means by which Adafruit calibrated the sensor. Keep in mind that I am new to the Arduino world.

Thanks

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adafruit_support_mike
 
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Re: MMA8451 Calibration

Post by adafruit_support_mike »

We don't calibrate them ourselves. Freescale calibrates them as part of the manufacturing process:
5.1 Device Calibration
The device interface is factory calibrated for sensitivity and Zero-g offset for each axis. The trim values are stored in Non Volatile Memory (NVM). On power-up, the trim parameters are read from NVM and applied to the circuitry. In normal use, further calibration in the end application is not necessary. However, the MMA8451Q allows the user to adjust the Zero-g offset for each axis after power-up, changing the default offset values. The user offset adjustments are stored in 6 volatile registers. For more information on device calibration, refer to Freescale application note, AN4069.
http://www.adafruit.com/datasheets/Free ... 451QR1.pdf
http://cache.freescale.com/files/sensor ... AN4069.pdf

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