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'[EE] Surface mount Light Dependent Resistor?'
2005\08\23@014446 by Brent Brown

picon face
Hi,

Anyone know if there is such a thing as an SMD LDR? Searched a little and
haven't seen anything yet. Doesn't need to be exceptionally small for this
project, but SMD 0805 case size would be convenient.

Will just be used to measure ambient light level, no great accuracy required,
input to micro ADC. I guess if the above doesn't exist then I could use an
SMD LED and use it like a photo-diode. Temperature could be a factor,
needs to work from about -10 to +80 deg C, but temperature is also
measured and input to the micro so could correct temp variations if we really
need to.

Thanks, Brent.

--
Brent Brown, Electronic Design Solutions
16 English Street, Hamilton 2001, New Zealand
Ph: +64 7 849 0069
Fax: +64 7 849 0071
Cell/txt: 027 433 4069
eMail:  spam_OUTbrent.brownTakeThisOuTspamclear.net.nz


2005\08\23@105318 by Harold Hallikainen

face picon face
Not what you were asking for, but I like the photodetectors at
http://www.taosinc.com . I've used their light to frequency converters,
color detectors, and am about to use a light to I2C converter.

Harold


--
FCC Rules Updated Daily at http://www.hallikainen.com

2005\08\23@172416 by Brent Brown

picon face
> Not what you were asking for, but I like the photodetectors at
> http://www.taosinc.com . I've used their light to frequency converters,
> color detectors, and am about to use a light to I2C converter.

Thanks for that. I'm guessing I might end up using a photodiode, perhaps
one with approximate "human eye" response. Looks like Cadmium Sulphide
as traditionally used in LDR's is on the list of "bad" sustances, so wont be in
any RoHS compliant products.

--
Brent Brown, Electronic Design Solutions
16 English Street, Hamilton 2001, New Zealand
Ph: +64 7 849 0069
Fax: +64 7 849 0071
Cell/txt: 027 433 4069
eMail:  .....brent.brownKILLspamspam@spam@clear.net.nz


2005\08\23@173304 by Bob Blick

face picon face

> Thanks for that. I'm guessing I might end up using a photodiode, perhaps
> one with approximate "human eye" response. Looks like Cadmium Sulphide
> as traditionally used in LDR's is on the list of "bad" sustances, so wont
> be in
> any RoHS compliant products.

I was under the impression they were OK, and that it was going to be
clarified that CDS photocells were OK:
http://www.pb-free.info/survey/8_popup.htm

-Bob


2005\08\23@175154 by Brent Brown

picon face
> > Thanks for that. I'm guessing I might end up using a photodiode, perhaps
> > one with approximate "human eye" response. Looks like Cadmium Sulphide
> > as traditionally used in LDR's is on the list of "bad" sustances, so wont
> > be in
> > any RoHS compliant products.
>
> I was under the impression they were OK, and that it was going to be
> clarified that CDS photocells were OK:
> http://www.pb-free.info/survey/8_popup.htm

I don't know really, I was only going by a brief comment on this web page...

http://www.vishay.com/photo-detectors/

May be just marketing hype.

--
Brent Brown, Electronic Design Solutions
16 English Street, Hamilton 2001, New Zealand
Ph: +64 7 849 0069
Fax: +64 7 849 0071
Cell/txt: 027 433 4069
eMail:  brent.brownspamKILLspamclear.net.nz


2005\08\23@181147 by Spehro Pefhany

picon face
At 09:24 AM 8/24/2005 +1200, you wrote:
> > Not what you were asking for, but I like the photodetectors at
> > http://www.taosinc.com . I've used their light to frequency converters,
> > color detectors, and am about to use a light to I2C converter.
>
>Thanks for that. I'm guessing I might end up using a photodiode, perhaps
>one with approximate "human eye" response. Looks like Cadmium Sulphide
>as traditionally used in LDR's is on the list of "bad" sustances, so wont
>be in
>any RoHS compliant products.

That aside, it may not be possible to make them withstand the temperatures
of surface mounting. I just pulled out a datasheet which shows the Ta
limited to only 75°C (despite ceramic/epoxy packaging).

That's why you don't see SMT polystyrene (or even mylar) capacitors.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
.....speffKILLspamspam.....interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com
->> Inexpensive test equipment & parts http://search.ebay.com/_W0QQsassZspeff

2005\08\24@040922 by Alan B. Pearce

face picon face
>> I was under the impression they were OK, and that it was
>> going to be clarified that CDS photocells were OK:
>> http://www.pb-free.info/survey/8_popup.htm
>
>I don't know really, I was only going by a brief comment
>on this web page...
>
>http://www.vishay.com/photo-detectors/
>
>May be just marketing hype.

Haven't looked at the pages, but I would have thought that anything
containing cadmium would be making people jittery when it comes to RoHS.

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