Servo problem
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Posts: 46,084
I am trying to experiment with a servo motor (Hitec HS-300) on BS2
but
have the following problem:
when using the following simple programs;
again:
for b2=100 to 200
for b3 = 1 to 5
pulsout 0,b2
pause 15
next
next
goto again
which is supposed to drive it from one extreme end of the servo's
motion to the other in small intervals, I can only get the servo to
move in one direction. Even if I use it with the following;
For b2 = 1 to 10
pulsout 0,150 ' center it with 10 pulses
next
the servo still turns in the counter clock direction for 10 pulses
intead of being centered! Even if I substitue 150 with 200 which is
supposed to move the servo to the extreme clockwise position, the
server moves in the ccw direction!
Th servo comes with three wires: black = ground, red = +5v and
yellow
which is supposed to be the signal. I have the yellow going to line
0
on the BS2, the red to an external 5vdc source and the black goes to
both the ground from the external source and the BS2's Vss line.
any help?
thanks
but
have the following problem:
when using the following simple programs;
again:
for b2=100 to 200
for b3 = 1 to 5
pulsout 0,b2
pause 15
next
next
goto again
which is supposed to drive it from one extreme end of the servo's
motion to the other in small intervals, I can only get the servo to
move in one direction. Even if I use it with the following;
For b2 = 1 to 10
pulsout 0,150 ' center it with 10 pulses
next
the servo still turns in the counter clock direction for 10 pulses
intead of being centered! Even if I substitue 150 with 200 which is
supposed to move the servo to the extreme clockwise position, the
server moves in the ccw direction!
Th servo comes with three wires: black = ground, red = +5v and
yellow
which is supposed to be the signal. I have the yellow going to line
0
on the BS2, the red to an external 5vdc source and the black goes to
both the ground from the external source and the BS2's Vss line.
any help?
thanks
Comments
however, the BS2 pulses in 2us units, so you should vary b2 from 500 to
1000. Also, I believe the "standard" pulse rate for servos is 50 Hz, so you
might try pause 20, but this may not be a problem.
Ray McArthur
Original Message
From: <alnajjar@s...>
To: <basicstamps@egroups.com>
Sent: Monday, August 21, 2000 11:58 PM
Subject: [noparse][[/noparse]basicstamps] Servo problem
> I am trying to experiment with a servo motor (Hitec HS-300) on BS2
> but
> have the following problem:
>
> when using the following simple programs;
>
> again:
> for b2=100 to 200
> for b3 = 1 to 5
> pulsout 0,b2
> pause 15
> next
> next
> goto again
>
> which is supposed to drive it from one extreme end of the servo's
> motion to the other in small intervals, I can only get the servo to
> move in one direction. Even if I use it with the following;
>
> For b2 = 1 to 10
> pulsout 0,150 ' center it with 10 pulses
> next
>
> the servo still turns in the counter clock direction for 10 pulses
> intead of being centered! Even if I substitue 150 with 200 which is
> supposed to move the servo to the extreme clockwise position, the
> server moves in the ccw direction!
>
> Th servo comes with three wires: black = ground, red = +5v and
> yellow
> which is supposed to be the signal. I have the yellow going to line
> 0
> on the BS2, the red to an external 5vdc source and the black goes to
> both the ground from the external source and the BS2's Vss line.
delay of 15 ms, which is the shortest delay that I can put in to make
work properly. Do you think that this servo may need 8.3V instead of
the 5 that I am providing? Otherwise, there is really no way to make
the servo respond faster.
Al
--- In basicstamps@egroups.com, "rjmca" <rjmca@w...> wrote:
> Your code would work with a BS1 which generates pulses in 10us
units;
> however, the BS2 pulses in 2us units, so you should vary b2 from
500
to
> 1000. Also, I believe the "standard" pulse rate for servos is 50
Hz, so you
> might try pause 20, but this may not be a problem.
>
> Ray McArthur
>
>
Original Message
> From: <alnajjar@s...>
> To: <basicstamps@egroups.com>
> Sent: Monday, August 21, 2000 11:58 PM
> Subject: [noparse][[/noparse]basicstamps] Servo problem
>
>
> > I am trying to experiment with a servo motor (Hitec HS-300) on BS2
> > but
> > have the following problem:
> >
> > when using the following simple programs;
> >
> > again:
> > for b2=100 to 200
> > for b3 = 1 to 5
> > pulsout 0,b2
> > pause 15
> > next
> > next
> > goto again
> >
> > which is supposed to drive it from one extreme end of the servo's
> > motion to the other in small intervals, I can only get the servo
to
> > move in one direction. Even if I use it with the following;
> >
> > For b2 = 1 to 10
> > pulsout 0,150 ' center it with 10 pulses
> > next
> >
> > the servo still turns in the counter clock direction for 10 pulses
> > intead of being centered! Even if I substitue 150 with 200 which
is
> > supposed to move the servo to the extreme clockwise position, the
> > server moves in the ccw direction!
> >
> > Th servo comes with three wires: black = ground, red = +5v and
> > yellow
> > which is supposed to be the signal. I have the yellow going to
line
> > 0
> > on the BS2, the red to an external 5vdc source and the black goes
to
> > both the ground from the external source and the BS2's Vss line.
I am not familiar with the Hitec HS-300 servo, but there are many on this
list with lots of servo experience...someone should be able to tell you what
voltage it is designed for.
Glad it's working, at least,
Ray McArthur
> Thanks! It works fine. However, it turns very slowly even with a
> delay of 15 ms, which is the shortest delay that I can put in to make
> work properly. Do you think that this servo may need 8.3V instead of
> the 5 that I am providing? Otherwise, there is really no way to make
> the servo respond faster.
>
> > I am trying to experiment with a servo motor (Hitec HS-300) on BS2
>Thanks! It works fine. However, it turns very slowly even with a
>delay of 15 ms, which is the shortest delay that I can put in to make
>work properly. Do you think that this servo may need 8.3V instead of
>the 5 that I am providing? Otherwise, there is really no way to make
>the servo respond faster.
Hi Al,
I can't tell from this post what it is you're trying to do with the
servo, it would help if you could post the entire code you are using now.
Don't increrase the voltage to the servo, this will drastically reduce it's
life (burn out the motor windings). For standard hobby servos 5v is
correct. I don't know what you mean by '15ms delay'...is this the interval
between the pulses you are sending to the servo? If so, it's a bit short,
as servos expect a 50hz pulse train. This will also depend on what else you
are getting your stamp to do. Adjusting this value will have no effect on
how fast the servo turns in any case. To make the servo turn faster, you
need to adjust the rate_of_change of the value you're using for the pulsout
command. This will adjust how quickly the width of the pulses changes.
ie.
loop:
x=x+10
pulsout x
goto loop
will cause the servo to move at a rate five times faster than
loop:
x=x+2
pulsout x
goto loop
Do you see what I mean? Of course, no matter how fast you change the
pulsewidth there is an upper limit on how fast the servo will go. This is
the transit time of the servo, usually indicated in degrees/sec in the
documentation for your particular model.
HTH, Duncan
>
>Just connect the 6V ground to the Stamp's ground. Without it, you
servo is
>"floating". Presumably you are driving the Stamp from a 5V supply or
a 9V
>battery or something. Just hook the - of the 5V supply or the battery
or the
>Stamp's Vss pin to the - terminal of the 6V supply for the servo.
>
>Regards,
>
>Al Williams
>AWC
>--- RONNIE GODWIN
>--- kb6rrt@e...
>--- EarthLink: It's your Internet.
>do you have all your grounds connected together ? >that might stop
the
>little jumps
Thanks for your help! It's actually working now.
Jason
__________________________________________________________________
Get your free Australian email account at http://www.start.com.au
and I am hoping
someone on this list can help me with some very annoying servo related
problems that
I have been struggling with.
I have my Stamp 2, 6V 1A powersupply, and servo connected EXACTLY like
this:
pin 0
| STAMP II |
|SERVO |
| |
| |
-| |+
|POWER 6V |
(no capacitors, resistors or diodes in the circuit at all)
the code I'm running with this setup is:
'
servo:
pulsout 0, 750 'servo centre position
pause 15
goto servo
'
I think this SHOULD centre the servo and hold it in that position, but
what happens is the
servo just keeps moving one way until it stops at the end of it's 180
deg movement range.
I thought maybe the servo had a badly positioned pot inside, but I
have tried all different
pulse lengths and pause lenghts and the servo still only moves in one
direction and stops
at it's limit of movement.
One clue is that even when I remove the "pulsout" command from my code
the servo
still makes little jumps forward, very randomly. Perhaps it's being
moved by some sort of
noise in the circuitry or something?
I'm also using a R/C hitec servo, instead of the more general futaba,
but the sources on
the net indicate that both types run on the same signal type, ie a
1-2ms
positive pulse every 20 ms.
Does anyone know what's going on? Maybe I'm making some simple
mistake?
Also, would it be possible to run five or even ten servo's from just
one stamp 2?
It seems that if I keep the entire program loop time under 20 ms it
should supply
all the servo's with correctly timed pulses. Or is it impossible to
control so many servos
wit a single stamp for power reasons etc?
sincerely,
Jason
__________________________________________________________________
Get your free Australian email account at http://www.start.com.au
> From: Jason 1 <plugger2@s...>
> To: basicstamps@egroups.com <basicstamps@egroups.com>
> Date: 10/13/00 4:51:22 AM
> Subject: [noparse][[/noparse]basicstamps] Servo Problem
>
> I'm new to this list and to the stamp, and a beginner to electronics,
> and I am hoping
> someone on this list can help me with some very annoying servo related
> problems that
> I have been struggling with.
>
> I have my Stamp 2, 6V 1A powersupply, and servo connected EXACTLY like
> this:
>
>
>
>
>
>
>
>
pin 0
> | STAMP II |
|SERVO |
>
> | |
> | |
> -| |+
>
> |POWER 6V |
>
>
>
> (no capacitors, resistors or diodes in the circuit at all)
>
>
>
>
>
>
>
>
>
>
> the code I'm running with this setup is:
>
> '
>
> servo:
>
> pulsout 0, 750 'servo centre position
> pause 15
>
> goto servo
>
> '
>
>
> I think this SHOULD centre the servo and hold it in that position, but
> what happens is the
> servo just keeps moving one way until it stops at the end of it's 180
> deg movement range.
> I thought maybe the servo had a badly positioned pot inside, but I
> have tried all different
> pulse lengths and pause lenghts and the servo still only moves in one
> direction and stops
> at it's limit of movement.
>
> One clue is that even when I remove the "pulsout" command from my code
> the servo
> still makes little jumps forward, very randomly. Perhaps it's being
> moved by some sort of
> noise in the circuitry or something?
>
>
> I'm also using a R/C hitec servo, instead of the more general futaba,
> but the sources on
> the net indicate that both types run on the same signal type, ie a
> 1-2ms
> positive pulse every 20 ms.
>
> Does anyone know what's going on? Maybe I'm making some simple
> mistake?
>
>
>
> Also, would it be possible to run five or even ten servo's from just
> one stamp 2?
> It seems that if I keep the entire program loop time under 20 ms it
> should supply
> all the servo's with correctly timed pulses. Or is it impossible to
> control so many servos
> wit a single stamp for power reasons etc?
>
>
> sincerely,
>
> Jason
>
> __________________________________________________________________
> Get your free Australian email account at http://www.start.com.au
>
>
>
>
--- RONNIE GODWIN
--- kb6rrt@e...
--- EarthLink: It's your Internet.
do you have all your grounds connected together ? that might stop the
little jumps
Do you have a common ground point between your 6V and the supply for the
Stamp? How is the Stamp powered?
You can run multiple servos at once, but as you point out, you rapidly get
to the point where all you are doing is running the servos. Check out the
link below to see our PAK-VIII which can run 8 servos at once without
loading the Stamp at all. In fact, you can see it doing just that in our
Stamp project of the month this month
(http://www.al-williams.com/awce/som.htm).
Regards,
Al Williams
AWC
* Control 8 servos at once with the PAK-VIII:
http://www.al-williams.com/awce/pak8.htm
>
>I'm new to this list and to the stamp, and a beginner to electronics,
>and I am hoping
>someone on this list can help me with some very annoying servo
related
>problems that
>I have been struggling with.
>
>I have my Stamp 2, 6V 1A powersupply, and servo connected EXACTLY
like
>this:
>
>
>
>
>
>
>
>
pin 0
>| STAMP II |
|SERVO |
>
> | |
> | |
> -| |+
>
> |POWER 6V |
>
>
>
>(no capacitors, resistors or diodes in the circuit at all)
My ascii picture didn't seem to make it intact, so I have made a gif
of my circuit, perhaps this will help.
>
>
>
>
>
>
>
>
>
>
>the code I'm running with this setup is:
>
>'
>
>servo:
>
>pulsout 0, 750 'servo centre position
>pause 15
>
>goto servo
>
>'
>
>
>I think this SHOULD centre the servo and hold it in that position,
but
>what happens is the
>servo just keeps moving one way until it stops at the end of it's 180
>deg movement range.
>I thought maybe the servo had a badly positioned pot inside, but I
>have tried all different
>pulse lengths and pause lenghts and the servo still only moves in one
>direction and stops
>at it's limit of movement.
>
>One clue is that even when I remove the "pulsout" command from my
code
>the servo
>still makes little jumps forward, very randomly. Perhaps it's being
>moved by some sort of
>noise in the circuitry or something?
>
>
>I'm also using a R/C hitec servo, instead of the more general futaba,
>but the sources on
>the net indicate that both types run on the same signal type, ie a
>1-2ms
>positive pulse every 20 ms.
>
>Does anyone know what's going on? Maybe I'm making some simple
>mistake?
>
>
>
>Also, would it be possible to run five or even ten servo's from just
>one stamp 2?
>It seems that if I keep the entire program loop time under 20 ms it
>should supply
>all the servo's with correctly timed pulses. Or is it impossible to
>control so many servos
>wit a single stamp for power reasons etc?
>
>
>sincerely,
>
>Jason
>
__________________________________________________________________
Get your free Australian email account at http://www.start.com.au
"floating". Presumably you are driving the Stamp from a 5V supply or a 9V
battery or something. Just hook the - of the 5V supply or the battery or the
Stamp's Vss pin to the - terminal of the 6V supply for the servo.
Regards,
Al Williams
AWC
* Floating point math for the Stamp, PIC, SX, or any microcontroller:
http://www.al-williams.com/awce/pak1.htm
>
Original Message
> From: Jason 1 [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=sZRKGZpi9937B6D8dzSt_xlD1yMhehlTgoRvomFYXMe9bEtj4NMDx3ejUJ2Fztwen52_6GWRDzU96-8BKSElBQ]plugger2@s...[/url
> Sent: Friday, October 13, 2000 5:28 PM
> To: basicstamps@egroups.com
> Subject: Re: [noparse][[/noparse]basicstamps] Servo Problem
>
>
> Original message from: "Al Williams" <alw@a...>
> >
> >Hi Jason (hmm... Jason on Friday the 13th....)
> >
> >Do you have a common ground point between your 6V and the supply for
> the
> >Stamp? How is the Stamp powered?--- RONNIE GODWIN
>
> --- kb6rrt@e... wrote:
> >--- EarthLink: It's your Internet.
> >do you have all your grounds connected together ? >that might stop
> the
> >little jumps
>
> Thanks for your help guys.
>
> I have attached a small gif file showing the circuit I'm using,
> because my original picture was scrambled.
>
> No, I do not have a common ground. How do I do this? What pins or
> wires do I join together to get a common groud?
>
>
> Jason
>
> __________________________________________________________________
> Get your free Australian email account at http://www.start.com.au
>
>
>
>
>Hi Jason (hmm... Jason on Friday the 13th....)
>
>Do you have a common ground point between your 6V and the supply for
the
>Stamp? How is the Stamp powered?--- RONNIE GODWIN
--- kb6rrt@e... wrote:
>--- EarthLink: It's your Internet.
>do you have all your grounds connected together ? >that might stop
the
>little jumps
Thanks for your help guys.
I have attached a small gif file showing the circuit I'm using,
because my original picture was scrambled.
No, I do not have a common ground. How do I do this? What pins or
wires do I join together to get a common groud?
Jason
__________________________________________________________________
Get your free Australian email account at http://www.start.com.au
the stamps power source, or the servo doesnt have any referance to know what
voltage is feeding the pulse line.
norm
>From: Jason 1 <plugger2@s...>
>Reply-To: basicstamps@egroups.com
>To: "basicstamps@egroups.com" <basicstamps@egroups.com>
>Subject: Re: [noparse][[/noparse]basicstamps] Servo Problem
>Date: Sat, 14 Oct 2000 7:7 +1000
>
>I wrote:
> >
> >I'm new to this list and to the stamp, and a beginner to electronics,
> >and I am hoping
> >someone on this list can help me with some very annoying servo
>related
> >problems that
> >I have been struggling with.
> >
> >I have my Stamp 2, 6V 1A powersupply, and servo connected EXACTLY
>like
> >this:
> >
> >
> >
> >
> >
> >
> >
> >
pin 0
> >| STAMP II |
|SERVO |
> >
> > | |
> > | |
> > -| |+
> >
> > |POWER 6V |
> >
> >
> >
> >(no capacitors, resistors or diodes in the circuit at all)
>
>
>
>
>
>
>My ascii picture didn't seem to make it intact, so I have made a gif
>of my circuit, perhaps this will help.
>
>
>
>
>
>
>
>
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >the code I'm running with this setup is:
> >
> >'
> >
> >servo:
> >
> >pulsout 0, 750 'servo centre position
> >pause 15
> >
> >goto servo
> >
> >'
> >
> >
> >I think this SHOULD centre the servo and hold it in that position,
>but
> >what happens is the
> >servo just keeps moving one way until it stops at the end of it's 180
> >deg movement range.
> >I thought maybe the servo had a badly positioned pot inside, but I
> >have tried all different
> >pulse lengths and pause lenghts and the servo still only moves in one
> >direction and stops
> >at it's limit of movement.
> >
> >One clue is that even when I remove the "pulsout" command from my
>code
> >the servo
> >still makes little jumps forward, very randomly. Perhaps it's being
> >moved by some sort of
> >noise in the circuitry or something?
> >
> >
> >I'm also using a R/C hitec servo, instead of the more general futaba,
> >but the sources on
> >the net indicate that both types run on the same signal type, ie a
> >1-2ms
> >positive pulse every 20 ms.
> >
> >Does anyone know what's going on? Maybe I'm making some simple
> >mistake?
> >
> >
> >
> >Also, would it be possible to run five or even ten servo's from just
> >one stamp 2?
> >It seems that if I keep the entire program loop time under 20 ms it
> >should supply
> >all the servo's with correctly timed pulses. Or is it impossible to
> >control so many servos
> >wit a single stamp for power reasons etc?
> >
> >
> >sincerely,
> >
> >Jason
> >
>
>
>
>
>
>
>
>
>
>
>
>__________________________________________________________________
>Get your free Australian email account at http://www.start.com.au
>
>
><< JasonsServoCircuit.gif >>
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Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com.
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http://profiles.msn.com.
Take a look at mine servo.doc file in the files directory
and please give some help
Thanks for any suggestion
Cyrill
He's connected a Servo (with separate 5 x 1.5 battery
, 7.5 volt pack) to a BS2 (with a 9-volt battery).
The grounds LOOK properly connected -- but that is
one possible problem -- do you REALLY have a ground
on the Stamp board?
Also -- you probably want a 10 uF capacitor between
the 7.5 volt + and Ground. You should already have
a 10 uF capacitor on the Stamp side.
Also -- your diagram shows the yellow wire on the
far left. Usually, the signal wire is in the middle.
Are you SURE your BS2 is talking on the signal wire,
and not the voltage supply wire?
--- In basicstamps@yahoogroups.com, "Cyrill" <creukelaar@h...> wrote:
> hallo
>
> Take a look at mine servo.doc file in the files directory
>
> and please give some help
>
>
>
>
> Thanks for any suggestion
> Cyrill
What do you mean with really ground ?that the stamp board is connected
to some kind off mass?Well it isn't.perhaps you wanna explain it some more.
and why.it should be conneced to really ground.
>Are you SURE your BS2 is talking on the signal wire,Yes
I'm sure.
But it aint possible that the servo uses the current of the 9 volt battery
?
> Also -- you probably want a 10 uF capacitor between
> the 7.5 volt + and Ground.
I ll do it.
cyrill
Original Message
From: "Allan Lane" <allan.lane@h...>
To: <basicstamps@yahoogroups.com>
Sent: Monday, June 07, 2004 5:43 PM
Subject: [noparse][[/noparse]basicstamps] Re: servo problem
> Summary:
>
> He's connected a Servo (with separate 5 x 1.5 battery
> , 7.5 volt pack) to a BS2 (with a 9-volt battery).
> The grounds LOOK properly connected -- but that is
> one possible problem -- do you REALLY have a ground
> on the Stamp board?
>
>
> Also -- you probably want a 10 uF capacitor between
> the 7.5 volt + and Ground. You should already have
> a 10 uF capacitor on the Stamp side.
>
> Also -- your diagram shows the yellow wire on the
> far left. Usually, the signal wire is in the middle.
> Are you SURE your BS2 is talking on the signal wire,
> and not the voltage supply wire?
>
>
>
> --- In basicstamps@yahoogroups.com, "Cyrill" <creukelaar@h...> wrote:
> > hallo
> >
> > Take a look at mine servo.doc file in the files directory
> >
> > and please give some help
> >
> >
> >
> >
> > Thanks for any suggestion
> > Cyrill
>
>
>
>
> To UNSUBSCRIBE, just send mail to:
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> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
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>
>
>
>
>
MUST have a good common ground between the
BS2 and the servo voltage supply.
The pin supplying the 'common ground' from the
BS2 supply was not clear in your diagram. It
didn't seem to be connected directly to the
BS2 power-supply. It seemed to be some distance
away. So I was not sure that it was even a
ground pin.
What happens is, the BS2 drives the signal
wire with a pulse. The BS2's reference for
this pulse is the BS2 ground. The Servo's
reference for reading this pulse is the
Servo's ground. If both grounds are not
the same, the pulse looks shifted in voltage
to the Servo, and won't be read properly.
If it is read properly, the Servo then uses
it's Power and Ground wires to actually drive
the motor inside it. This can again shift the
ground reference (if both grounds are NOT
connected properly) leading to 'ghost pulses'
on the signal wire.
--- In basicstamps@yahoogroups.com, "Cyrill" <creukelaar@h...> wrote:
> thanks for the reaction
>
> What do you mean with really ground ?that the stamp board is
connected
> to some kind off mass?Well it isn't.perhaps you wanna explain it
some more.
> and why.it should be conneced to really ground.
>
> >Are you SURE your BS2 is talking on the signal wire,Yes
> I'm sure.
>
> But it aint possible that the servo uses the current of the 9 volt
battery
> ?
>
> > Also -- you probably want a 10 uF capacitor between
> > the 7.5 volt + and Ground.
> I ll do it.
>
> cyrill
>
>
>
>
>
Original Message
> From: "Allan Lane" <allan.lane@h...>
> To: <basicstamps@yahoogroups.com>
> Sent: Monday, June 07, 2004 5:43 PM
> Subject: [noparse][[/noparse]basicstamps] Re: servo problem
>
>
> > Summary:
> >
> > He's connected a Servo (with separate 5 x 1.5 battery
> > , 7.5 volt pack) to a BS2 (with a 9-volt battery).
> > The grounds LOOK properly connected -- but that is
> > one possible problem -- do you REALLY have a ground
> > on the Stamp board?
> >
> >
> > Also -- you probably want a 10 uF capacitor between
> > the 7.5 volt + and Ground. You should already have
> > a 10 uF capacitor on the Stamp side.
> >
> > Also -- your diagram shows the yellow wire on the
> > far left. Usually, the signal wire is in the middle.
> > Are you SURE your BS2 is talking on the signal wire,
> > and not the voltage supply wire?
> >
> >
> >
> > --- In basicstamps@yahoogroups.com, "Cyrill" <creukelaar@h...>
wrote:
> > > hallo
> > >
> > > Take a look at mine servo.doc file in the files directory
> > >
> > > and please give some help
> > >
> > >
> > >
> > >
> > > Thanks for any suggestion
> > > Cyrill
> >
> >
> >
> >
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