Subject:
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Re: 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 15:18:11 GMT
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Viewed:
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3284 times
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In lugnet.robotics.rcx, Dirk Schlei writes:
> 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
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 sensor value. I monitor the sensor in a little loop right after
sending the IR message. This ensures that I capture the peak value.
Dean
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Message has 1 Reply:
 | | Re: IR Proximity Detection Problem
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| Dean, Philo, Thank you both very much: Including the sensor monitoring in a "repeat"-loop brouhgt the solution. Works quite perfect. I guess "SendMessage" is somewhat slow, i. e. the IR-emission/reflection. Now I am going to even improve the (...) (22 years ago, 17-Jan-03, to lugnet.robotics.rcx)
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Message is in Reply To:
| | IR Proximity Detection Problem
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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 (...) (22 years ago, 16-Jan-03, to lugnet.robotics.rcx)
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