Subject:
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IR Proximity Detection Problem
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Thu, 16 Jan 2003 14:42:32 GMT
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Viewed:
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3097 times
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I have tried to get proximity dectection via RCX emitting IR
(SendMessage/NQC) and Light Sensor (mounted on top of the RCX's IR unit).
But the raw values seemed to be the same with/without emitting IR. Average
value was 725. Went up to 800 (black paper) at the maximum or down to 650,
respectively. Never got a difference bigger than 100. Any idea?
Dirk
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Message has 3 Replies:
 | | Re: IR Proximity Detection Problem
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| Maybe the ambient light is too high ? in that case you can decrease visible light sensitivity as well as shielding detector from red LED light using this method : (URL) (only hope that this doesn't offend your "Lego purity" sense ;o) Philo (...) (22 years ago, 16-Jan-03, to lugnet.robotics.rcx)
| | | Re: IR Proximity Detection Problem
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| (...) Dirk, I had a similar problem when I first tried, eventually determining that I wasn't measuring the light sensor value while the message was being sent. You have to wait a little bit after sending the message before reading the peak light (...) (22 years ago, 16-Jan-03, to lugnet.robotics.rcx)
| | | Re: IR Proximity Detection Problem
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| (...) A friend of mine attempted this setup a while back and came to the conclusion that he basically needed to be nearly perfectly perpendicular to the object he was trying to detect. So he decided this was way to precise/finicky for his general (...) (22 years ago, 17-Jan-03, to lugnet.robotics.rcx)
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