[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[Paparazzi-devel] Fwd: ETS airspeed sensor data.

From: Helge Walle
Subject: [Paparazzi-devel] Fwd: ETS airspeed sensor data.
Date: Sun, 18 Jan 2015 13:41:55 +0100


To try and get a better airspeed reading from the EagleTree v3 airspeed sensor in default mode, I now read pressure and temperature from my BMP085 baro into airspeed_ets.c via air_data.c. Air density is taken into account using the pitot formula . I have not tried this in flight yet, but calculations I have done predict some, but not big, improvements.

But then there is the offset drift. At low airspeeds (15m/s) this is a rather big problem. Not knowing the spesification of the raw data from the sensor it is difficult, if at all possible, to compensate for it.

I read somewhere about making a differential pressure unit consisting of two ms5611 barometers. I don't know if this will give the desired results, as these will also have drift, but I may give it a try. Then I would want to connect the two baros physically close together. I have a Twog and a Lisa/M, and for this I would like to use the Twog.

I am not sure about the best method of configuring two standalone ms5611's into Paparazzi, one of them using the alternate I2C address. Is there a straightforward way to do this?

It seems that the calculation of airspeed is supposed to be done in air_data.c. Is this correct?

Thanks, Helge.

reply via email to

[Prev in Thread] Current Thread [Next in Thread]