Subject:
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Re: ir obstacle detector
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Tue, 10 Dec 1996 01:08:08 GMT
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Original-From:
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MAR ERICSON <mar@!spamcake!cooper.edu>
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Viewed:
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1602 times
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> Included in the fax they send you is a schematic for a transmitter and
> receiver. I used the transmitter and then, since I wasn't interested in
> decoding the signal, I used the output as it was, with a capacitor to do
> a bit of smoothing. Connected it to the Handy/Mini board analog sensor
> inputs and it gives a distinct level change as an object gets to within
> about 20 cm.
Why is the distance do short?
You can use a remote control for a TV or someting from really far away and even bounce the IR off walls.
Doesn't that mean that you can do the same for a sensor?
Or is it that the current generation of phototransistors are not sensitive enough?
Or am I totally off and asking a dumb question? :)
-e
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Message has 1 Reply:
 | | Re: ir obstacle detector
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| In your message you said: (...) en bounce the IR off walls. yes, but the tv remote technology includes automatic gain circuits, so you have no way of telling HOW FAR AWAY the original signal source is. (...) ough? You can use a simple reflectance (...) (28 years ago, 10-Dec-96, to lugnet.robotics.handyboard)
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Message is in Reply To:
| | ir obstacle detector
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| This is the number of Radio Shacks fax service. I had bought the IR detector module part number 267-137 and on the back it said "For a complete data sheet call Radio Shack FaxBack at 1-800-323-6586 and request document #3313. If you do not have a (...) (28 years ago, 9-Dec-96, to lugnet.robotics.handyboard)
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