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AW: [Paparazzi-devel] IR sensors issue

From: Roman Nikitin
Subject: AW: [Paparazzi-devel] IR sensors issue
Date: Tue, 22 Mar 2011 20:59:53 -0000



I double checked the connections, they looks fine. The IR sensors are new. I did not really understood what did you mean with this “...then the IR sensor is returning 0V”?!




Von: address@hidden [mailto:address@hidden Im Auftrag von David Carlson
Gesendet: Dienstag, 22. März 2011 19:37
An: address@hidden
Betreff: Re: [Paparazzi-devel] IR sensors issue


If you are getting -523, which is the same value that use used as an offset, then the IR sensor is returning 0V.  You can double-check this with a multimeter.  But the problem either lies with a faulty connection between IR board and AP, or the IR sensor is bad.  They are pretty simple boards so if you determine that it is a problem with the hardware, feel free to contact me and I can walk you through some troubleshooting if necessary.


On 03/22/2011 05:58 AM, Roman Nikitin wrote:



Hallo all,


We have a problem with IR sensor I have not seen before.


As IR sensors we are using FMA direct (+5V), because we had problems to buy IR sensors with +3.3V supply. In my last post I did ask if we could use FMA sensor without any resistor replacement.  The answer was, a resistor replacement is (probably) not required and they should work fine in UK weather conditions.


After we did try to calibrate IR we have got the following results in data link message window. The values int16 ir1 and int16 lateral are equal to -523, it is the same value we did set up in the airframe file to get other values  to 0.  As I know, it should be possible to see changes in the values int16 ir1 and int16 lateral, however they are stay constant all the time (during the calibration process and during IR sensors are not covered, not in the box).


You can also see that the PFD in GCS window shows that the artificial horizon is turned by approximately 90°. It does not changes a lot if you move your hand in front of the sensors trying to change the signals.   


Have anybody  had similar problems with this kind of sensors? Any ideas?


Thank you in advance.




Roman and Co.


Bristol Institute of Technology

University of the West of England

Aerospace Systems Engineering

e-mail: address@hidden

tel. +44 (0) 7760806643


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