why the bmp 280 altimeter showing false result

[asadnemer231]

why the bmp 280 altimeter showing false result and whay it varies continuously after each disconnecting and connecting. im using teensy4.1 as microcontroler

 

[cbrarick]

the bmp280 gives you a measurement of air pressure. If you are getting a false report of altitude, look at your program. Also understand that sea level hPa is 1013.25. This is just a average and may be affected by anything altering the barometric pressure where your arduino is, including the venting design of the ebay and it's susceptibility to wind gusts

 

[asadnemer231]

thanks for your reply.
i used the bmp280 standard example so i dont think the code had problem.

update: if changes the default altitude number to my local altitude every thing will be corrected

 

[jderimig]

update: if changes the default altitude number to my local altitude every thing will be corrected

First things first. Is the pressure in Pa calculated from the BMP280 correct to your local barometric pressure? You may have to get that from a local weather station?

 

[asadnemer231]

First things first. Is the pressure in Pa calculated from the BMP280 correct to your local barometric pressure? You may have to get that from a local weather station?

yes i get it from my local weather station.

 

[jderimig]

yes i get it from my local weather station.

So is the pressure reported correctly in your implementation but the altitude is not?

 

[asadnemer231]

I did not notice whether the pressure was right or wrong but the problem is that the altitude varied in same place in time frame about two hours as it apears in attached files

 

[OzHybrid]

deleted

 

[jderimig]

I did not notice whether the pressure was right or wrong but the problem is that the altitude varied in same place in time frame about two hours as it apears in attached files

That is normal. Weather (barometric pressure) changes.

Good job. It working!

 

[asadnemer231]

thanks all bro's