Searching \ for ' [PIC] Pic based laser oscilloscope' in subject line. ()
Make payments with PayPal - it's fast, free and secure! Help us get a faster server
FAQ page: www.piclist.com/techref/displays.htm?key=laser
Search entire site for: 'Pic based laser oscilloscope'.

No exact or substring matches. trying for part
PICList Thread
'[PICLIST] [PIC] Pic based laser oscilloscope'
2001\01\22@104004 by info

flavicon
face
Hi all
I wanted to construct a rough oscilloscope type audio projector with a
laser diode and a pic.
Sample through the AD
use this value to control something that will change the x'y position of
the laser diode and with it the display on the wall.
Any ideas
Alan

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads


2001\01\22@105921 by M. Adam Davis

flavicon
face
Well, you could use a dc motor (a very small one), attach a mirror to its
shaft tip at a 45 degree angle - so if the laser is pointing stright down
the shaft, it hits the mirror and shines to the side.  If the motor
rotates it sweeps the laser around in a big circle.  Now attach another
rod to the shaft sticking out one side perpendicular to the shaft.  Attach
a spring to it and fix the other end of the spring somewhere else.

The more current/voltage you apply to the motor, the more the mirror
deflects the laser to one side or the other depending on the polarity.
This is a very basic meter movement, and has many drawbacks, but for a
simple demonstration it is sufficient.

You can set up another motor in a similar manner and use a triangle
generator to sweep the beam back and forth before bouncing it off the
first.  The end result is a rough oscilliscope.

-Adam

info wrote:
{Quote hidden}

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads


2001\01\22@111426 by James Paul

flavicon
face
All,

It would seem to me that the motors have too much inertia to be
useful for anything other than 10Hz or less (probably less).
You might want to consider either an RC Servo, or possibly a speaker
with a magnet attached to the rim somewhere, and another connection
from the opther side of the mirror to center of the cone.  Then
supply the speaker with a low current DC.   I know this works as
I've done it and it's usable to at least 5Khz.  I used it for a Ham
Radio Modulation Monitor using a laser and projected on a wall so a
large audience could see the modulation envelope as they were
hearing the modulating signal (me talking).  Granted, this is an AC
signal, but you can feed DC to it and use it in static deflection
too.   Just make sure you limit the current to the voice  coil.
Otherwise, you'll fry the speaker.  Of course, if you'll be
projecting an audio signal, you don't have to worry about the DC
precautions.

Anyway, that's my contribution to the question.  Good luck.


                                            Regards,

                                              Jim
 On Mon, 22 January 2001, "M. Adam Davis" wrote:

{Quote hidden}

spam_OUTjimTakeThisOuTspamjpes.com

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads


2001\01\22@112251 by Sid Pryce

flavicon
face
I was thinking about something the same in the past. The problem was how to
to the laser deflection excluding mirrors and servos because of the slow
speed. Any ideas about the laser deflection?
Pryce

{Original Message removed}

2001\01\22@115758 by Simon Nield

flavicon
face
sid:
>Any ideas about the laser deflection?

I thought the way most of these systems worked was one mirror attached at an angle to a motor,
spinning at constant speed to give x axis scan, then a second mirror on some kind of voice coil
arrangement to give the y axis.

iirc maplin used to sell a home-brew kit for this kind of thing, there were pictures of the
arrangement in the catalog... try their website http://www.maplin.co.uk

Regards,
Simon

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads


2001\01\22@171549 by Germain Morbe

flavicon
face
> Hi all
> I wanted to construct a rough oscilloscope type audio projector with a
> laser diode and a pic.
> Sample through the AD
> use this value to control something that will change the x'y position of
> the laser diode and with it the display on the wall.
> Any ideas
> Alan

For a simple scope function use 2 mirors as Alan did explain already. Use a
Power-Op for the Y(audio) -axis and also a OP based Sawwave Generator for
the X(line)-axis. There is not much a PIC can do in this application except
being to slow.

Germain Morbe

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads


2001\01\23@031258 by Roman Black

flavicon
face
info wrote:
>
> Hi all
> I wanted to construct a rough oscilloscope type audio projector with a
> laser diode and a pic.
> Sample through the AD
> use this value to control something that will change the x'y position of
> the laser diode and with it the display on the wall.
> Any ideas
> Alan


Hi Alan, http://www.oatleyelectronics.com
sell a cheap "laser light show" kit that has two
scanner motor/mirrors. It will do what you want
if you can control the motors or replace them with
small steppers from floppy drives, etc. :o)
-Roman

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics


2001\01\23@032304 by Roman Black

flavicon
face
Simon Nield wrote:
>
> sid:
> >Any ideas about the laser deflection?
>
> I thought the way most of these systems worked was one mirror attached at an angle to a motor,
> spinning at constant speed to give x axis scan, then a second mirror on some kind of voice coil
> arrangement to give the y axis.
>
> iirc maplin used to sell a home-brew kit for this kind of thing, there were pictures of the
> arrangement in the catalog... try their website http://www.maplin.co.uk
>
> Regards,
> Simon


A couple of suggestions, all fax machines have precision front-surface
mirrors, these are thin glass strips and can be snapped to size.
Also, any hard drive that does NOT have a stepper motor on the
outside is a "voice coil" type. These have an expensive neodymium
super-magnet and deflection coil setup, useful for high speed high
precision deflection. Just glue a mirror (or the laser!) on
it and use a spinning mirror for the x scan.
-Roman

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics


2001\01\23@033742 by Bureriu Cristian

flavicon
face
What about a continous x AND y scanning using motors and modulating the
laser diode?
Sid

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics


2001\01\23@033758 by Roman Black

flavicon
face
Germain Morbe wrote:
>
> > Hi all
> > I wanted to construct a rough oscilloscope type audio projector with a
> > laser diode and a pic.
> > Sample through the AD
> > use this value to control something that will change the x'y position of
> > the laser diode and with it the display on the wall.
> > Any ideas
> > Alan
>
> For a simple scope function use 2 mirors as Alan did explain already. Use a
> Power-Op for the Y(audio) -axis and also a OP based Sawwave Generator for
> the X(line)-axis. There is not much a PIC can do in this application except
> being to slow.


Yes and no, the PIC might be too slow to do the whole ADC
conversion and display... But if using a voice coil to
scan Y he could use a simple audio analog circuit to
drive it, and a PIC would be perfect to synchronise the
spinning X motor to an exact speed and sync. :o)
-Roman

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics


2001\01\23@050129 by Jinx

face picon face
> Also, any hard drive that does NOT have a stepper motor on the
> outside is a "voice coil" type. These have an expensive neodymium
> super-magnet and deflection coil setup, useful for high speed high
> precision deflection. Just glue a mirror (or the laser!) on
> it and use a spinning mirror for the x scan.
> -Roman

I thought about doing this to make a pen plotter - then realised I've
nothing desperately important to plot ;-((  Good idea about the laser
though and I've found a novel use for the magnets, TTYL about it

Have you ever tried the mirror mechs from Oatley ? Thinking of
re-stocking on their bargains/surplus soon and wondered if it was
worth getting one to muck about with

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics


2001\01\23@072535 by Vasile Surducan

flavicon
face
part 0 144 bytes
--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics


2001\01\23@175824 by Peter L. Peres

picon face
Your something should be able to move fairly fast. This is not so easy.
You can use a speaker modulator. This is a small bass speaker (soft
suspension) with a small mirror attached to it. The mirror needs to be
small and light. A small piece of tinfoil glued on the cone will work. You
bounce the beam off the mirror at abt. 45 degrees, and use a convex mirror
to magnify the deflection. This will also upset focus but the alternative
is a $300 lens (at least). If you have a theatre binocular or a kid's
microscope you can use that (will require some tinkering to get the
distances right). Never look into the beam, use a piece of paper as a
screen.

I know what your next question will be ;-)

Peter

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics


2001\01\23@192159 by info

flavicon
face
In message <.....Pine.LNX.4.10.10101232054330.600-100000KILLspamspam@spam@plp.plp.home.org>,> Peter L. Peres <plpspamKILLspamACTCOM.CO.IL> writes
>Your something should be able to move fairly fast. This is not so easy.
>You can use a speaker modulator. This is a small bass speaker (soft
>suspension) with a small mirror attached to it. The mirror needs to be
>small and light. A small piece of tinfoil glued on the cone will work. You
>bounce the beam off the mirror at abt. 45 degrees, and use a convex mirror
>to magnify the deflection. This will also upset focus but the alternative
>is a $300 lens (at least). If you have a theatre binocular or a kid's
>microscope you can use that (will require some tinkering to get the
>distances right). Never look into the beam, use a piece of paper as a
>screen.
>
>I know what your next question will be ;-)


And the best way to scan the x axis and keep it synchronised ? (;

>
>Peter
>
>--
>http://www.piclist.com hint: The list server can filter out subtopics
>(like ads or off topics) for you. See http://www.piclist.com/#topics
>
>

*******************************************************
Broadcast Warehouse ( FM Transmitters and accessories )
Website:            http://www.broadcastwarehouse.com
Email:              .....infoKILLspamspam.....broadcastwarehouse.com
Phone:
   sales:          +44 (0) 208 5409992
   tech support:   +44 (0) 208 5409993
Fax:                +44 (0) 208 5409994
*******************************************************

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics


2001\01\24@063343 by Roman Black

flavicon
face
Jinx wrote:
>
> > Also, any hard drive that does NOT have a stepper motor on the
> > outside is a "voice coil" type. These have an expensive neodymium
> > super-magnet and deflection coil setup, useful for high speed high
> > precision deflection. Just glue a mirror (or the laser!) on
> > it and use a spinning mirror for the x scan.
> > -Roman
>
> I thought about doing this to make a pen plotter - then realised I've
> nothing desperately important to plot ;-((  Good idea about the laser
> though and I've found a novel use for the magnets, TTYL about it
>
> Have you ever tried the mirror mechs from Oatley ? Thinking of
> re-stocking on their bargains/surplus soon and wondered if it was
> worth getting one to muck about with


No I haven't tried the mirror laser light show things, but
I have bought other things from them.

Have you tried one of their peltier devices? They're fun
to play with, add electricity and make cold. :o)
-Roman

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.


2001\01\24@065452 by Jinx

face picon face
> Have you tried one of their peltier devices? They're fun
> to play with, add electricity and make cold. :o)
> -Roman

I've tried a couple of times but they were out of stock. The
job I was getting them for has long gone. LCDs were the
real bargain in the last order, big 32 x 4's for a song

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.


2001\01\24@075900 by Roman Black

flavicon
face
Jinx wrote:
>
> > Have you tried one of their peltier devices? They're fun
> > to play with, add electricity and make cold. :o)
> > -Roman
>
> I've tried a couple of times but they were out of stock. The
> job I was getting them for has long gone. LCDs were the
> real bargain in the last order, big 32 x 4's for a song

Doh! I missed those!
-Roman

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.


2001\01\24@091404 by Bureriu Cristian

flavicon
face
Hey, what's that?

-----------------


<<< No Message Collected >>>



http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.


More... (looser matching)
- Last day of these posts
- In 2001 , 2002 only
- Today
- New search...