Zstar3 sensor PC application: calibration

sewhyong — Thu, 29 Oct 2020 09:27:11 GMT

Hi,

I have a MMA7455L sensor board and USB stick. I am developing c# PC application with zstarlib.dll and I never change the software of the MMA7455L sensor board.

After AutoCalibrateAll() is called from PC side, I don't understand why the X and Y axis are calibrated to 0g, but Z-axis is calibrated to 1g?

theZStar.AutoCalibrateAll();

When I received the sensor real acceleration data through USB Stick, do I need to re-calculate the Z data like explained in AN3447?

For the Simple 0g X, 0g Y, +1g Z calibration technique a slightly different calculation is required for the Z axis which has recorded the CZOFF value at +1g. The sensitivity ‘S’ must therefore be subtracted from CZOFF in the calculation.

For the Z Case:
AMEAS = [CA- (CZOFF-S)] ⁄ S

Please advice.

Thank you.

Best Regards,

SewHyong

8-bit MicrocontrollersのトピックZstar3 sensor PC application: calibration

Zstar3 sensor PC application: calibration