SEN0657 wind speed values
paulv 2026-02-17 18:32:58 134 Views4 Replies I am using the SEN0657 Ultrasonic 7-in-1 RS485 weather station.
The documentation states that the value in register 01F4 should be divided by 100 to get the speed in m/s - I have now been using this unit outside for a couple of weeks and the windspeed readings always appear to be around 10 times lower than weather forecast values.
Is there an error in the documentation - should the value be divided by 10?
After confirmation by our product team: the earlier shipped versions of SEN0657 require the value in register 01F4 to be divided by 100 to get wind speed in m/s, while the latest shipped version needs to be divided by 10. We have updated the Wiki documentation accordingly.
niu.yixuan Hi, we sincerely apologize for our delayed response to your query.
We have immediately passed this wind speed register calculation problem to our product team for verification, and we will get back to you as soon as we have an update.
Thank you for your patience and valuable feedback!
niu.yixuan Hi Richard,
No responses from DFRobot but I am pretty convinced that their documentation is wrong. The wind speed value from the register should be divided by 10.
paulv Did you get any feedback on this? I am observing the exact same thing!
Richard.White 
