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Re: [Paparazzi-devel] thermopile / rocket

From: Bernard Davison
Subject: Re: [Paparazzi-devel] thermopile / rocket
Date: Thu, 25 Jun 2009 22:38:48 +1000

Similar things have been done since the 60s but always in conjunction with gyros and have been mainly used to check that the correct attitude is correct.
If you're thinking of using it as the control for a gimbal you'll find that the response rate is far to slow.

If you want to discuss this further I'd recommend bringing it up on the arocket list
They will help you out but like all email lists take any and all advice with a grain of salt.


On 25/06/2009, at 11:56 AM, Don Shrum wrote:

I'm interested in using the Horizontal IR sensor from the Paparazzi project in an amateur rocket.  My intent is to use the two axis Horizontal IR sensor to control servos that will position a motor attached to a gimbal.  The rocket would fly perpendicular to the horizon and there would be no course guidance.

The board I am planning to buy is this one.

I would like to verify some assumptions.

The sensor I am planning to buy is detailed here -

I am assuming that pins 1 and 4 supply a positive or negative variable voltage that relates to the direction and angle of bank on each of the two axes.  Is there a document that explains that in detail?  Is this voltage constantly supplied?  Could someone confirm this is the case?

I have been told these sensors may not work at high altitudes.  I assume this might be because the 'image' seen by the sensors will become proportionally more sky as altitude increases and thus, the difference between the opposed sensors might become less.  Is this the case?  Is there some other reason the sensors become less effective at altitude?

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