Subject:
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Re: pyroelectric sensor
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 19 Nov 1999 23:15:49 GMT
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Original-From:
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OneTimeCRX <hchea@ramapo.#AntiSpam#edu>
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Viewed:
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989 times
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Michael Gasperi wrote:
> Too bad the sensor doen't have enough output to directly drive the RCX
> input. Is the 5V regulator really necessary for the pyrolectric sensor to
> work? It looks like it has a fairly broad operating voltage spec. 5-15VDC.
> --
Maybe it can run without an analog interface, and maybe it can run
without a voltage regulator, but I don't know because I haven't tried it
nor do I have the electronics background to know any better. Maybe
somebody else can say from the specs?
http://www.acroname.com/robotics/parts/R1-442-3.html
I am probably wrong here, but I think that a voltage regulator is needed
because the output on the sensor is (at most) equal to the input voltage
(V+). So even if the sensor can take an input of 7 volts that the rcx
feeds it, it's not supposed to output 7 volts too because the rcx only
wants a max of 5 volts.
Assuming that at the very least the sensor gets 5 volts in, and outputs
between 0-5 volts, perhaps it can be connected directly to the rcx as
long as one knows which lead is V+ and which lead is ground (on the
rcx). So in brief, maybe only a bridge rectifier and voltage regulator
are needed, and one can do without the op-amp.
I got another dual element pyroelectric sensor, which I ripped out of a
radioshack security motion sensor (part #49-208). The sensor itself is
made by Heimann, and has the inscriptions "185", "LHI 958", and "3936"
on it. Does anybody know where I can get the specs for it?
--
Cheers,
Henry C.
***********************************************************
* TAS: Physics 89 CR-X dx *
* Email: hchea@ramapo.edu OR OneTimeCRX@aol.com *
* OR OneTimeCRX@hotmail.com *
***********************************************************
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Message has 1 Reply:
 | | Re: pyroelectric sensor
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| OneTimeCRX <lego-robotics@crynwr.com> wrote in message news:3835D9F8.8E24F0...apo.edu... (...) what's a few cents for an opamp and voltage regulator. I wouldn't touch anything. (...) Your are correct that 5V is the limit of the analog to digital (...) (25 years ago, 20-Nov-99, to lugnet.robotics)
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Message is in Reply To:
| | Re: pyroelectric sensor
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| OneTimeCRX <lego-robotics@crynwr.com> wrote in message news:3834E50A.A738C9...apo.edu... (...) input. Is the 5V regulator really necessary for the pyrolectric sensor to work? It looks like it has a fairly broad operating voltage spec. 5-15VDC. (25 years ago, 19-Nov-99, to lugnet.robotics)
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