# PX4 1.9.2 with pmw3901

**URL:** <https://discuss.px4.io/t/px4-1-9-2-with-pmw3901/12971>\
**Category:** Uncategorized\
**Created:** [September 17, 2019, 2:55pm UTC](https://discuss.px4.io/t/px4-1-9-2-with-pmw3901/12971 "2019-09-17T14:55:17Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![wisology](https://discuss.px4.io/letter_avatar_proxy/v4/letter/w/c77e96/32.png) [@wisology](https://discuss.px4.io/u/wisology)\
**Post date:** [September 17, 2019, 2:55pm UTC](https://discuss.px4.io/t/px4-1-9-2-with-pmw3901/12971/1 "2019-09-17T14:55:17Z")

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What’s the direction of the pmw3901?  
Reference to the datasheet and px4flow guidance document ,the y direction of pmw3901 module is consistent with the flight control body,but it’s no use,the drone crashed every time…  
Thanks.

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**Author:** ![jkflying](https://discuss.px4.io/user_avatar/discuss.px4.io/jkflying/32/6082_2.png) [@jkflying](https://discuss.px4.io/u/jkflying)\
**Post date:** [September 20, 2019, 9:06am UTC](https://discuss.px4.io/t/px4-1-9-2-with-pmw3901/12971/2 "2019-09-20T09:06:12Z")

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Make sure you have the **SENS\_FLOW\_ROT** parameter set to 0 if you have the arrow on the PMW board pointing forward.