Northern California
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Posts: 46,084
I'm working with a laser diode module and a
photo detector and was looking for some
help in northern California. Anyone with
knowledge or experience, student or pro?
Thank you...
photo detector and was looking for some
help in northern California. Anyone with
knowledge or experience, student or pro?
Thank you...
Comments
-William
Original Message
From: Hank <fhb2000@p...>
To: <basicstamps@egroups.com>
Sent: Saturday, October 07, 2000 3:15 PM
Subject: [noparse][[/noparse]basicstamps] Northern California
> I'm working with a laser diode module and a
> photo detector and was looking for some
> help in northern California. Anyone with
> knowledge or experience, student or pro?
> Thank you...
>
>
>
>
>
>
>
>
effective) using a photocell to detect a break in a laser beam. The laser
source was ~650nm and I just used a standard photocell. It was even
interfaced to a basic stamp. Email me and I can probably dig up the
schematic. Oh, and I am in Northern California too, but I am sure I can
help you via email.
--Dan
dankgus@e...
Original Message
From: Hank <fhb2000@p...>
To: <basicstamps@egroups.com>
Sent: Saturday, October 07, 2000 12:15 PM
Subject: [noparse][[/noparse]basicstamps] Northern California
> I'm working with a laser diode module and a
> photo detector and was looking for some
> help in northern California. Anyone with
> knowledge or experience, student or pro?
> Thank you...
>
>
>
>
>
>
>
>
particular project so I don't remember all the details of the photocell, but
if I remember correctly, the photocell had a resistance of about 1.5K when
the laser diode was aimed directly at the photocell and when the beam was
broken, the resistance went up to around 20K very rapidly. The schematic is
in PSPICE version 8.0. I used an inverter to interface the
transistor/photocell circuit to the stamp, kind of a buffer. I had the
photocell mounted in a tube about 1.5" deep so that ambient light would not
interfere with the photocell. When the laser was aiming at the photocell,
the output of the inverter was low. When the beam broke, the output was
high. The PSPICE Ver 8.0 that I have always used was an evaluation from
Microsim. I think somebody else bought them out so the demo is available
from somebody else now. Please don't make fun of my design, it is simple
and it worked GREAT. I have never felt like an expert with transistors but
with PSPICE on my side, I can usually design damn near anything. Here is
the link to the schematic:
http://home.earthlink.net/~dankgus/SCHEMATICS/photocell.sch
Let me know if there is any questions.
--Dan
Original Message
From: Dan Gustafson <dankgus@e...>
To: <basicstamps@egroups.com>
Sent: Saturday, October 07, 2000 7:24 PM
Subject: Re: [noparse][[/noparse]basicstamps] Northern California
> What are you trying to do? I once designed a circuit (really simple but
> effective) using a photocell to detect a break in a laser beam. The laser
> source was ~650nm and I just used a standard photocell. It was even
> interfaced to a basic stamp. Email me and I can probably dig up the
> schematic. Oh, and I am in Northern California too, but I am sure I can
> help you via email.
>
> --Dan
William Cox wrote:
> www.gorobotics.net/clubs.shtml - Look here for some folks.
> -William
>
>
Original Message
> From: Hank <fhb2000@p...>
> To: <basicstamps@egroups.com>
> Sent: Saturday, October 07, 2000 3:15 PM
> Subject: [noparse][[/noparse]basicstamps] Northern California
>
> > I'm working with a laser diode module and a
> > photo detector and was looking for some
> > help in northern California. Anyone with
> > knowledge or experience, student or pro?
> > Thank you...
> >
> >
> >
> >
> >
> >
> >
> >