Bitcraze Forums

Hi, what are or could the high altimeter sensor be used for? (height hovering)?

The resolution is at 10cm but what are the accuracy? +-1.5mBar, what is that in height from zero calibration?

MS5611-01BA03

Kind regards

There are some ongoing development of a hover mode which should be achievable.

and what about the accuracy? I got it to be +-10 meter's ? That have to be wrong.

I think accuracy is not that relevant to the flie. The barometer is designed to be used for measuring heights. You need to calibrate it for absolute height because of the weather. However, assuming stable weather, it could then go on to be used to measure the height of a mountain that you walk/drive/fly up.

The usage in the flie is probably very different.You turn it on, take a reading, count that as zero and fly from there. You can make a simple assumption that you are fling at sea level and use a simple calculation for mb to meters. (I think I used 7mb = 100m)

When flying you just want to go up a bit or down a bit. Resolution is important but absolute accuracy or even scale accuracy is not that important.

Having said all that a few things do not seem to add up. I think the calculation given on the data sheet is in 0.01 mb resolution. Which I think is more like 14cm than 10.
I may have this wrong.

Also, in practice, as you can see from the data sheet, there are many sources of error. In practice it seams only possible to get a good reading by filtering, which will introduce a lag that then upsets the control system.