Subject:
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Re: IR Demodulator Range Finder Hack
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Mon, 17 Nov 1997 17:21:57 GMT
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Original-From:
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Graeme Dunbar <G.R.A.Dunbar@eee.rgu.ac.uk#nospam#>
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Viewed:
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1093 times
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On 17 Nov 97 at 11:08, John Hatton wrote:
> A few months ago I found information on how to modify the Sharp IR
> Demodulator to produce an analogue voltage relating to the strength
> of IR received. The problem is that I have lost the information and
> can't remember where I saw it. Has anybody else seen this
> information and remember where it was or have sufficient information
> to perform the modification ?.
>
> Thanks in advance for any help.
>
> John Hatton
> johnha@icsplc.co.uk
I would be interested to hear about this too please. We are running
a Group Design Exercise (our own version of a Lego robot
competition). Designing the staff entry (to check the idea was
feasible in the short time alloctated to the exercise) I noticed that
using a Sharp IS1U60 to locate a beacon, the duration of the
output pulse seemed to depend on the signal strength. I assume that
with a stronger signal it takes longer for the capacitor/resistor
preceding the comparator to discharge.
My final design used two detectors pointing forward and a baffle to
cast a shadow if the beacon shone from the side. This gives a
simple left-forward-right signal. However if I had more time I would
see if it was possible to make use of the variation in pulse width.
I think it might be possible to overlap the fields of view of the two
detectors and use the difference in pulse widths to give a
proportional feedback signal. Has anyone tried this?
Regards,
Graeme
------------------------------------------------------------
Graeme Dunbar
School of Electronic and Electrical Engineering
The Robert Gordon University
Schoolhill, Aberdeen AB10 1FR, Scotland, U.K.
Tel. +44 1224 262415
Fax +44 1224 262444
email g.r.a.dunbar@rgu.ac.uk
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Message is in Reply To:
 | | IR Demodulator Range Finder Hack
|
| A few months ago I found information on how to modify the Sharp IR Demodulator to produce an analogue voltage relating to the strength of IR received. The problem is that I have lost the information and can't remember where I saw it. Has anybody (...) (27 years ago, 17-Nov-97, to lugnet.robotics.handyboard)
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