g-sensor value on Z direction is negative when Z-axis is downwards?

[E-John]

Dear SIR,

I found that LSM6DSR got negative value when X-axis is upwards, got negative value when Y-axis is upwards.

Why only Z-direction got postivie value when Z is upwards?

That seems break the right-hand-rule direction. Is ther any reason for that?

Thanks.

[Eleon BORLINI]

Hi @E-John​ ,

I believe this is just a matter of convention. The convention adopted is the one described in the datasheet, p.6. The arrows are indicating the value of the positive acceleration verse.

 

-Eleon

[E-John]

HI Eleon,

By right-hand-rule, the value on z-axis arrows pointed should be positvie value. Here we got the opposed result.

Just want to know what kind of convention make z-axis point to the negative acceleration value.

Thanks.

E-John