Ditigal Control of Light
Anyone have any suggestions on how to control brightness of a 120vac 250
watt lightbulb using a BS1 or 2?
Hey, I know it's probably a dumb question...
Thanks.
Rus
--
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watt lightbulb using a BS1 or 2?
Hey, I know it's probably a dumb question...
Thanks.
Rus
--
Bones
"Ghoul-Will Ambassador to the Boneyard"
Atrophies - Ghoulishly Original Awards & Trophies
http://www.bluedestiny.com/Atrophies/
SpiderBucky & SpiderThrifty - Boney Superheroes
http://www.bluedestiny.com/SpiderBucky/
Keeper of the Bucky-n-Thrifty Flame
http://www.boneyardbargains.com/
"my mind wanders....I'm just along for the ride"
Comments
You can wire the lamp in series with a triac. This is a bi-directional scr
device. I would utilize an opto-isolator between the dc output of the stamp,
and the ac input of the triac. Just make sure the device you choose can
handle the current of the lamp, and if necessary is adequately heatsunk.
If you send a pulse stream to the triac gate, the light will come on in
proportion to the frequency of these pulses.
good luck
Russ
Original Message
From: Rus Hardy <rushardy@m...>
To: Stamp Group <basicstamps@yahoogroups.com>
Sent: Friday, June 15, 2001 4:49 PM
Subject: [noparse][[/noparse]basicstamps] Ditigal Control of Light
| Anyone have any suggestions on how to control brightness of a 120vac 250
| watt lightbulb using a BS1 or 2?
|
| Hey, I know it's probably a dumb question...
|
| Thanks.
|
| Rus
|
| --
| Bones
| "Ghoul-Will Ambassador to the Boneyard"
| Atrophies - Ghoulishly Original Awards & Trophies
| http://www.bluedestiny.com/Atrophies/
| SpiderBucky & SpiderThrifty - Boney Superheroes
| http://www.bluedestiny.com/SpiderBucky/
| Keeper of the Bucky-n-Thrifty Flame
| http://www.boneyardbargains.com/
| "my mind wanders....I'm just along for the ride"
|
|
|
| To UNSUBSCRIBE, just send mail to:
| basicstamps-unsubscribe@yahoogroups.com
| from the same email address that you subscribed with. Text in the Subject and
Body of the message will be ignored.
|
|
| Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
|
|
|
[noparse][[/noparse]basicstamps] Ditigal Control of Light:
>
>
>| Anyone have any suggestions on how to control brightness of a 120vac 250
>| watt lightbulb using a BS1 or 2?
>|
Solid State relays (available from the usual suspects) can send power
to the lamp with the low voltage signal from the Stamp.
Varying the output pulse width and/or timing would set the brightness?
--
-. .-. .-. .-. .-. .-. .-. .-. .-. .-
\ / \ / \ N / \ C / \ S / \ S / \ M / \ / \ /
`-' `-' `-' `-' `-' `-' `-' `-' `-'
Chuck Britton Education is what is left when
britton@n... you have forgotten everything
North Carolina School of Science & Math you learned in school.
(919) 286-3366 x224 Albert Einstein, 1936
the zero crossing of the line. This is phase angle control. Counting zero
crossings and firing every n crossings can give you some control, but will
cause flicker if used over the entire range. Using the ability of the Stamp
to combine both of these (set a delay after zero crossing before firing the
triac and counting zero crossings) will probably give you the best results.
Now, all you have to do is get the zero crossing information into the
Stamp. Running a variable frequency into the gate or turning on an SSR with
such a signal will vary the output, but not in a continuous way. The 60 hZ
line will beat with the control signal.
Isn't this the kind of thing that the X10 folks do all the time? Might be
something in SmartHouse.com
Mike
At 03:49 PM 6/15/2001 -0500, you wrote:
>Anyone have any suggestions on how to control brightness of a 120vac 250
>watt lightbulb using a BS1 or 2?
>
>Hey, I know it's probably a dumb question...
>
>Thanks.
>
>Rus
_________________________________
Mike Walsh
walsh@i...
triggers fast enougn, it ends up looking not like a series of quick
flashes but as a continuous luminosity.
On Fri, 15 Jun 2001, Rus Hardy wrote:
> Anyone have any suggestions on how to control brightness of a 120vac 250
> watt lightbulb using a BS1 or 2?
>
> Hey, I know it's probably a dumb question...
>
> Thanks.
>
> Rus
>
> --
> Bones
> "Ghoul-Will Ambassador to the Boneyard"
> Atrophies - Ghoulishly Original Awards & Trophies
> http://www.bluedestiny.com/Atrophies/
> SpiderBucky & SpiderThrifty - Boney Superheroes
> http://www.bluedestiny.com/SpiderBucky/
> Keeper of the Bucky-n-Thrifty Flame
> http://www.boneyardbargains.com/
> "my mind wanders....I'm just along for the ride"
>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed with. Text in the Subject and
Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>
Sean T. Lamont, CTO / Chief NetNerd, Abstract Software, Inc. (ServNet)
Seattle - Bellingham - Vancouver - Portland - Everett - Tacoma - Bremerton
email: lamont@a... WWW: http://www.serv.net
"...There's no moral, it's just a lot of stuff that happens". - H. Simpson
I've used a voltage controlled dimmer kit made by
Velleman. I control it with a MAX500 DAC (two wire
serial). Total cost is about $35.00. It does give
very fine control - 255 steps from off to full bright.
This frees the stamp for other things except when
changing the brightness. Jameco sells the Velleman
kit. Another option is to use a X10 dimmer control -
I don't have any experience with those, though.
Lew Muller
--- Rus Hardy <rushardy@m...> wrote:
> Anyone have any suggestions on how to control
> brightness of a 120vac 250
> watt lightbulb using a BS1 or 2?
>
> Hey, I know it's probably a dumb question...
>
> Thanks.
>
> Rus
>
> --
> Bones
> "Ghoul-Will Ambassador to the Boneyard"
> Atrophies - Ghoulishly Original Awards & Trophies
> http://www.bluedestiny.com/Atrophies/
> SpiderBucky & SpiderThrifty - Boney Superheroes
> http://www.bluedestiny.com/SpiderBucky/
> Keeper of the Bucky-n-Thrifty Flame
> http://www.boneyardbargains.com/
> "my mind wanders....I'm just along for the ride"
>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed
> with. Text in the Subject and Body of the message
> will be ignored.
>
>
> Your use of Yahoo! Groups is subject to
> http://docs.yahoo.com/info/terms/
>
>
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work okay for you. Although you did not state what
type of light bulb you have. Is the lamp an
incandescent or is it some type of arc lamp? The arc
type lamps, such as a metal halide or sodium need a
ballast and will not start to illuminate without the
proper starting voltage.
--- Rus Hardy <rushardy@m...> wrote:
> Anyone have any suggestions on how to control
> brightness of a 120vac 250
> watt lightbulb using a BS1 or 2?
>
> Hey, I know it's probably a dumb question...
>
> Thanks.
>
> Rus
>
> --
> Bones
> "Ghoul-Will Ambassador to the Boneyard"
> Atrophies - Ghoulishly Original Awards & Trophies
> http://www.bluedestiny.com/Atrophies/
> SpiderBucky & SpiderThrifty - Boney Superheroes
> http://www.bluedestiny.com/SpiderBucky/
> Keeper of the Bucky-n-Thrifty Flame
> http://www.boneyardbargains.com/
> "my mind wanders....I'm just along for the ride"
>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed
> with. Text in the Subject and Body of the message
> will be ignored.
>
>
> Your use of Yahoo! Groups is subject to
> http://docs.yahoo.com/info/terms/
>
>
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work okay for you. Although you did not state what
type of light bulb you have. Is the lamp an
incandescent or is it some type of arc lamp? The arc
type lamps, such as a metal halide or sodium need a
ballast and will not start to illuminate without the
proper starting voltage.
--- Rus Hardy <rushardy@m...> wrote:
> Anyone have any suggestions on how to control
> brightness of a 120vac 250
> watt lightbulb using a BS1 or 2?
>
> Hey, I know it's probably a dumb question...
>
> Thanks.
>
> Rus
>
> --
> Bones
> "Ghoul-Will Ambassador to the Boneyard"
> Atrophies - Ghoulishly Original Awards & Trophies
> http://www.bluedestiny.com/Atrophies/
> SpiderBucky & SpiderThrifty - Boney Superheroes
> http://www.bluedestiny.com/SpiderBucky/
> Keeper of the Bucky-n-Thrifty Flame
> http://www.boneyardbargains.com/
> "my mind wanders....I'm just along for the ride"
>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed
> with. Text in the Subject and Body of the message
> will be ignored.
>
>
> Your use of Yahoo! Groups is subject to
> http://docs.yahoo.com/info/terms/
>
>
__________________________________________________
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a year! http://personal.mail.yahoo.com/
> > Anyone have any suggestions on how to control
> > brightness of a 120vac 250
> > watt lightbulb using a BS1 or 2?
> >
> > Hey, I know it's probably a dumb question...
> >
> > Thanks.
> >
> > Rus
Hi Rus: Haven't had the time to try it but the AN1515 by Motorola uses a 555
timer which has zero detection; phase control and is optically isolated.
The circuit shown controls a motor but it should also control an
incandescent lamp.
Replacing "VR1" (see page 3 of the AN1515) with a digital pot would perhaps
allow stamp control with multiple increments. A slow dim or ramp up could be
achieved by adding a capacitor. This solution may be too labour intensive
but it seems simple and has the big advantage that it is optically isolated
from line voltages.
http://merchant.hibbertco.com/fs22/deact/fs22/pdf-docs/motorola/an1515.rev1.
pdf
Good Luck,
Sean
··w
[/font]
Original Message
From: "Sean Gibson" <seangib@h...>
To: <basicstamps@yahoogroups.com>
Sent: Saturday, June 16, 2001 1:15 PM
Subject: Re: [noparse][[/noparse]basicstamps] Ditigal Control of Light
>
> > --- Rus Hardy <rushardy@m...> wrote:
> > > Anyone have any suggestions on how to control
> > > brightness of a 120vac 250
> > > watt lightbulb using a BS1 or 2?
> > >
> > > Hey, I know it's probably a dumb question...
> > >
> > > Thanks.
> > >
> > > Rus
>
>
> Hi Rus: Haven't had the time to try it but the AN1515 by Motorola uses a
555
> timer which has zero detection; phase control and is optically isolated.
>
> The circuit shown controls a motor but it should also control an
> incandescent lamp.
>
> Replacing "VR1" (see page 3 of the AN1515) with a digital pot would
perhaps
> allow stamp control with multiple increments. A slow dim or ramp up could
be
> achieved by adding a capacitor. This solution may be too labour intensive
> but it seems simple and has the big advantage that it is optically
isolated
> from line voltages.
>
> Sorry, the correct URL is http://appnote.stts.edu/Motorola/sudah.htm
>
> Good Luck,
>
> Sean
>
>
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>
>