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Re: [Paparazzi-devel] Re: Interfacing to the EagleTree airspeed sensor

From: Roman Krashanitsa
Subject: Re: [Paparazzi-devel] Re: Interfacing to the EagleTree airspeed sensor
Date: Tue, 8 Sep 2009 13:40:57 -0700

Hi Vassilis,
Good job on the airspeed sensor. Did you do any finer analysis on error estimates for the sensor? From the plot, I can see that your GPS measurements were not very stable and/or airspeed measurements are very inertial. Is it true?
What was the mean and deviation of the difference between GPS and airspeed readings in a stable portion of the flight?

2009/9/7 Vassilis V. <address@hidden>
I got both the airspeed and altimeter sensors from EagleTree working. The source code and some data can be found at:

At this point I am simply passing the airspeed and altitude through the telemetry down to the ground station. The next step is to work on fw_v_ctl.c to allow the airspeed to be used for  controlling the throttle (i.e. maintain constant airspeed). This will take me a bit longer, I will let you know when I have something working.


On Sep 6, 2009, at 9:59 AM, Vassilis V. wrote:


I had a successful flight with the EagleTree airspeed module ( ) connected to my TWOG. I did not have to do any hardware modifications, the sensor has an I2C interface that I connected directly to the TWOG I2C port. I was able to figure out the slave address and decode the raw output of the sensor. The results are quite good, the module is low cost ($43) and comes with a very good pitot tube that includes static and dynamic ports. For now I am simply sending the airspeed through the telemetry, the next step would be to modify the autopilot code to regulate the throttle in order to keep the airspeed constant (and a minimum ground speed). I will do the same with the altimeter sensor.

See for more information, I will publish the code as soon as I have the altimeter tested (probably in a week or so). Is there any interest on getting this released code released into CVS?


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