Subject:
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Re: Running IR in the background
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Newsgroups:
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lugnet.robotics.rcx.legos
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Date:
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Wed, 28 Mar 2001 07:03:05 GMT
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Viewed:
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1780 times
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> I got it to work last night. I'm modifying Markus Noga rover.c code
> (included when you download legos files) to include support for IR port and
> (passive) light sensor. Great code to look at if you're just learning
> C/C++. Basically, the active sensor does a poor job of detecting obstacles
> and is too sensitive to changes in ambient light levels. I noticed using
> ds_passive the values were much more stable (around 77-78) in almost any
> normal lighting environment. Even as I lowered the lights in the room the
> values still seemed to stay around 77-78. This may have something to do
> with Marcus Noga processed light level routine in dsensor.h. I thought at
> first it just changes hex into dec, but apparently it changes the entire
> scaling and range of the light values. It may be possible to get more
> fidelity out of the original raw values...
Congratulations!
Could you post your source code here, to compare with the solution that we
previously submitted to an almost identical question?
We use an active light sensor reading in one taks, with a different task bangin
zeroes using lnp_logical_write (getting around the blocking part very
elegantly).
See http://news.lugnet.com/robotics/rcx/legos/?n=1783
Our robot is a bit wide (built on the base robot with threads and not wheels),
and uses bumpers to find things outside its field of vision. The
obstactle-detection distance varies with the lights somewhat, but in general,
we do at about 10 to 20 cm, i.e. 4 to 8 inches. The system is stable, working
fine when crawling under tables and into dark corners.
/jakob
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Message is in Reply To:
 | | Re: Running IR in the background
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| Hannes, I got it to work last night. I'm modifying Markus Noga rover.c code (included when you download legos files) to include support for IR port and (passive) light sensor. Great code to look at if you're just learning C/C++. Basically, the (...) (24 years ago, 27-Mar-01, to lugnet.robotics.rcx.legos)
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