Today's Message Index:
----------------------
1. 12:29 AM - Re: AeroElectric-List Digest: 7 Msgs - 10/12/11 (K Fohringer)
2. 02:37 PM - Optical Switch? (jonlaury)
3. 03:11 PM - Re: Optical Switch? (thomas sargent)
4. 07:20 PM - Re: Optical Switch? (Michael Welch)
5. 07:21 PM - Re: Optical Switch? (Bob McCallum)
Message 1
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| Subject: | RE: AeroElectric-List Digest: 7 Msgs - 10/12/11 |
Message 2
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I need a switch that activates when something moves in front of a sensor. This
is not an aviation application. But I'm sure that someone on the list can save
me having to decipher all the offerings on Digi-key.
I'm envisioning something similar to a garage door opener saftey beam/switch, but
way smaller, to operate on 12 vdc, for detection of material in a machine process.
Thanks for any help,
John
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=354946#354946
Message 3
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| Subject: | Re: Optical Switch? |
I don't know if this is appropriate for your purpose but there's a class of
optically operated switches called photo-interupters. It's a U shaped piece
of plastic with an LED (usually infra-red) in one leg of the U shining acros
to a phototransistor in the other side of the U. If anything moves into the
gap it interrupts the beam and that trigger s the switch. They are small and
cheap. The Mouser.com catalog has lots of them, also digi-key or Newark.
They also have other types of "proximity" sensors that might be more useful
to you.
On Thu, Oct 13, 2011 at 2:31 PM, jonlaury <jonlaury@impulse.net> wrote:
>
> I need a switch that activates when something moves in front of a sensor.
> This is not an aviation application. But I'm sure that someone on the list
> can save me having to decipher all the offerings on Digi-key.
>
>
--
Tom Sargent
Message 4
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| Subject: | Re: Optical Switch? |
John,
I built a little circuit exactly as you describe. It was the first electronic
circuit I ever built.
If you want, I can scan the circuit and email it to you. It's made with a 555
timer IC, a couple
of transistors, and a few other basic parts. If you want to build the circuit
you are talking about, this is it.
Mike Welch
Message 5
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John;
There are literally tens of thousands of sensors that fit the limited
information you have provided. To narrow it down you need to specify the
range (distance) at which you are attempting to sense the object, the size
of the object, the surface finish, reflectivity, colour of the object, etc
etc. Then you need to know if you wish to use a through beam style (one of
the easiest to set up), retro reflective (sensor looks at a reflector behind
the object), or diffuse reflective (sensor looks directly for the object
just as would your eye) Each type has its pros and cons depending on the
characteristics of the application.
Here is a link to one family of sensors by one manufacturer out of hundreds
available. Their products are sold by all of the major electronics houses
such as Mouser, Digi-key, and Newark etc. The acceptable voltage range is 12
- 24 VDC the switching load current is 100ma max.
http://tinyurl.com/6hzwkwq
The brochures and data sheets listed here will enable you to make a choice
which fits your criteria. Look particularly at the "E3Z photoelectric
sensors data sheet" near the bottom of the page. It will list all the specs
necessary for you to make an informed decision for your particular
application.
I specify these and similar sensors by the dozen on a daily basis but cannot
recommend a specific part number for your application without much more
detail of the characteristics of your part and exactly what you're trying to
accomplish.
Bob McC
> -----Original Message-----
> From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-
> server@matronics.com] On Behalf Of jonlaury
> Sent: Thursday, October 13, 2011 5:32 PM
> To: aeroelectric-list@matronics.com
> Subject: AeroElectric-List: Optical Switch?
>
>
> I need a switch that activates when something moves in front of a sensor.
This is not
> an aviation application. But I'm sure that someone on the list can save me
having to
> decipher all the offerings on Digi-key.
>
> I'm envisioning something similar to a garage door opener saftey
beam/switch, but
> way smaller, to operate on 12 vdc, for detection of material in a machine
process.
>
> Thanks for any help,
> John
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=354946#354946
>
>
>
>
>
>
>
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