LED control interfering w/servo control
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I'm stumped--
I have a BS2SX controlling servos and a light source. One light
source I'm using is a 110VAC, 60Hz LED lamp (like the ones they're
using for traffic signals now). Of course my stamp is triggering a
relay to control this. I notice that when I turn the LED on & off,
my servos twitch. However, when I replace that light source with a
standard light bulb (60W) and turn it on and off, it doesn't
interfere with the servos at all. Any suggestions about what I could
do? Thanks.
Jon
I have a BS2SX controlling servos and a light source. One light
source I'm using is a 110VAC, 60Hz LED lamp (like the ones they're
using for traffic signals now). Of course my stamp is triggering a
relay to control this. I notice that when I turn the LED on & off,
my servos twitch. However, when I replace that light source with a
standard light bulb (60W) and turn it on and off, it doesn't
interfere with the servos at all. Any suggestions about what I could
do? Thanks.
Jon
Comments
the circuit. If you use a separate servo supply, remember to connect
the servo supply ground to the BASIC Stamp ground.
-- Jon Williams
-- Applications Engineer, Parallax
-- Dallas Office
Original Message
From: jhtoolman2000 [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=WY5tB_j4_ombPDQ7R_dNqY06lNfwbpfJvld3JS3ZRfCTOIr_knywcH7Q5XryHDNL-sKs8T2NxZ_6jqSfMw]jhtoolman2000@y...[/url
Sent: Sunday, February 29, 2004 11:01 AM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] LED control interfering w/servo control
I'm stumped--
I have a BS2SX controlling servos and a light source. One light
source I'm using is a 110VAC, 60Hz LED lamp (like the ones they're
using for traffic signals now). Of course my stamp is triggering a
relay to control this. I notice that when I turn the LED on & off,
my servos twitch. However, when I replace that light source with a
standard light bulb (60W) and turn it on and off, it doesn't
interfere with the servos at all. Any suggestions about what I could
do? Thanks.
Jon
off at a high resistance, then the resistance
drops as the lamp heats up and lights up. This
is 'nice', as you don't get a large current
surge when you first turn on the light.
I don't know what circuitry they have around
your LED's, but its probable there is a current
pulse when you first turn them on which is
somehow being coupled to your Servos.
More capacitance between your power-supply line
and ground may handle this. You may also need
a larger (more current) power supply.
--- In basicstamps@yahoogroups.com, "jhtoolman2000"
<jhtoolman2000@y...> wrote:
> I'm stumped--
> I have a BS2SX controlling servos and a light source. One light
> source I'm using is a 110VAC, 60Hz LED lamp (like the ones they're
> using for traffic signals now). Of course my stamp is triggering a
> relay to control this. I notice that when I turn the LED on & off,
> my servos twitch. However, when I replace that light source with a
> standard light bulb (60W) and turn it on and off, it doesn't
> interfere with the servos at all. Any suggestions about what I
could
> do? Thanks.
>
> Jon
Regards
ECO
Original Message
From: "Allan Lane" <allan.lane@h...>
To: <basicstamps@yahoogroups.com>
Sent: Monday, March 01, 2004 4:09 PM
Subject: [noparse][[/noparse]basicstamps] Re: LED control interfering w/servo control
> I believe a standard incandescent lamp starts
> off at a high resistance, then the resistance
> drops as the lamp heats up and lights up.
resistance goes up as the filament heats up.
Original Message
From: "Allan Lane" <allan.lane@h...>
To: <basicstamps@yahoogroups.com>
Sent: Monday, March 01, 2004 7:09 AM
Subject: [noparse][[/noparse]basicstamps] Re: LED control interfering w/servo control
> I believe a standard incandescent lamp starts
> off at a high resistance, then the resistance
> drops as the lamp heats up and lights up. This
> is 'nice', as you don't get a large current
> surge when you first turn on the light.
>
> I don't know what circuitry they have around
> your LED's, but its probable there is a current
> pulse when you first turn them on which is
> somehow being coupled to your Servos.
>
> More capacitance between your power-supply line
> and ground may handle this. You may also need
> a larger (more current) power supply.
>
> --- In basicstamps@yahoogroups.com, "jhtoolman2000"
> <jhtoolman2000@y...> wrote:
> > I'm stumped--
> > I have a BS2SX controlling servos and a light source. One light
> > source I'm using is a 110VAC, 60Hz LED lamp (like the ones they're
> > using for traffic signals now). Of course my stamp is triggering a
> > relay to control this. I notice that when I turn the LED on & off,
> > my servos twitch. However, when I replace that light source with a
> > standard light bulb (60W) and turn it on and off, it doesn't
> > interfere with the servos at all. Any suggestions about what I
> could
> > do? Thanks.
> >
> > Jon
>
>
>
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and I got it wrong. So, the MOST current
will be drawn at the beginning.
This still doesn't tell us how much current
is drawn by the LED-based lighting circuit,
nor it's startup behavior.
--- In basicstamps@yahoogroups.com, "Stephen H Chapman"
<chapman@t...> wrote:
> An Incandescent lamp has a low resistance when the filament is cold
and
> resistance goes up as the filament heats up.
>
Original Message
> From: "Allan Lane" <allan.lane@h...>
> To: <basicstamps@yahoogroups.com>
> Sent: Monday, March 01, 2004 7:09 AM
> Subject: [noparse][[/noparse]basicstamps] Re: LED control interfering w/servo control
>
>
> > I believe a standard incandescent lamp starts
> > off at a high resistance, then the resistance
> > drops as the lamp heats up and lights up. This
> > is 'nice', as you don't get a large current
> > surge when you first turn on the light.
> >
> > I don't know what circuitry they have around
> > your LED's, but its probable there is a current
> > pulse when you first turn them on which is
> > somehow being coupled to your Servos.
> >
> > More capacitance between your power-supply line
> > and ground may handle this. You may also need
> > a larger (more current) power supply.
> >
> > --- In basicstamps@yahoogroups.com, "jhtoolman2000"
> > <jhtoolman2000@y...> wrote:
> > > I'm stumped--
> > > I have a BS2SX controlling servos and a light source. One light
> > > source I'm using is a 110VAC, 60Hz LED lamp (like the ones
they're
> > > using for traffic signals now). Of course my stamp is
triggering a
> > > relay to control this. I notice that when I turn the LED on &
off,
> > > my servos twitch. However, when I replace that light source
with a
> > > standard light bulb (60W) and turn it on and off, it doesn't
> > > interfere with the servos at all. Any suggestions about what I
> > could
> > > do? Thanks.
> > >
> > > Jon
> >
> >
> >
> > To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@yahoogroups.com
> > from the same email address that you subscribed. Text in the
Subject and
> Body of the message will be ignored.
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >