Question about servo controller (#28023)
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Posts: 46,084
Hello again everyone. First of all I will have the website about the
skull I made up soon. I'm interested in hearing suggestions on how
to more efficently do some things...
As far as the servo controller (#28023) is concerned, I've just read
through the documentation, and have a few questions:
When you position a servo with this controller, is it's position
maintained (ie is it continually pulsed until told otherwise?) Or is
it just moved to that position (but not continually pulsed
thereafter)?
It says in the documentation that you need a seperate power source
than for example the BOE board. Is there any way to use the power
from the BOE if using a wall plug power source? (Like using the
jumper on the BOE rev C to set the servo headers to Vin rather than
the 5v setting?
Thanks again,
Ryan
skull I made up soon. I'm interested in hearing suggestions on how
to more efficently do some things...
As far as the servo controller (#28023) is concerned, I've just read
through the documentation, and have a few questions:
When you position a servo with this controller, is it's position
maintained (ie is it continually pulsed until told otherwise?) Or is
it just moved to that position (but not continually pulsed
thereafter)?
It says in the documentation that you need a seperate power source
than for example the BOE board. Is there any way to use the power
from the BOE if using a wall plug power source? (Like using the
jumper on the BOE rev C to set the servo headers to Vin rather than
the 5v setting?
Thanks again,
Ryan
Comments
sending the proper signals every 20 ms or so. You don't need to worry
about refreshing the servos, that's the job of the PSC. When you want a
servo to move, send a new position command and the PSC will do
everything else.
-- Jon Williams
-- Applications Engineer, Parallax
-- Dallas Office
Original Message
From: LostboY [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=ECMviqHRiKiKKR7bd-WrgT8rNtsGnQY4J3IDd_CLGI_CxRM2heNlFe-tdU9sAgRlu0TxW5v6_xS3]hangook21@y...[/url
Sent: Monday, July 12, 2004 1:08 AM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Question about servo controller (#28023)
Hello again everyone. First of all I will have the website about the
skull I made up soon. I'm interested in hearing suggestions on how
to more efficently do some things...
As far as the servo controller (#28023) is concerned, I've just read
through the documentation, and have a few questions:
When you position a servo with this controller, is it's position
maintained (ie is it continually pulsed until told otherwise?) Or is
it just moved to that position (but not continually pulsed
thereafter)?
It says in the documentation that you need a seperate power source
than for example the BOE board. Is there any way to use the power
from the BOE if using a wall plug power source? (Like using the
jumper on the BOE rev C to set the servo headers to Vin rather than
the 5v setting?
Thanks again,
Ryan
PSC, but it didn't mention if it would continue to pulse for me)
Can you jumper the BOE rev c to the 'input power' for the servo
headers and use those to power the PSC?
Ryan
--- In basicstamps@yahoogroups.com, "Jon Williams" <jwilliams@p...>
wrote:
> The PSC will in fact hold your servo at the last commanded position
by
> sending the proper signals every 20 ms or so. You don't need to
worry
> about refreshing the servos, that's the job of the PSC. When you
want a
> servo to move, send a new position command and the PSC will do
> everything else.
>
> -- Jon Williams
> -- Applications Engineer, Parallax
> -- Dallas Office
The following answer is from the developer of the PSC.
He's not subscribed to the forum, so I'm posting it for him
Saludos,
Aristides Alvarez
Education Manager
aalvarez@p...
Parallax, Inc. www.parallax.com
USA
Hi Ryan,
I can answer your questions regarding the Parallax Servo Controller.
1) The current version of firmware pulses the servo continuously. We
are working on a version in which you can disable/enable any servo with a
serial command. I imagine we will release that version at the end of this
month.
2) Its possible, though untested. First, you would need a supply that
can deliver 2-3 amps at a voltage suitable for your servos.
Ensure the jumper on the BOE is in the VDD position. This jumper
controls the power supply voltage to the servo controller itself, so we need
that at 5 VDC. Servo power must be separate (or as separate as possible).
Then, connect VIN and VSS from the BOE to the servo supply terminals on the
servo controller. I don't know if this will work or not, but its the best
chance you have of using the same
supply for both.
Honestly, you'd be better off using a 9V battery to supply the BOE, and
simply connect the wall plug power supply to the terminal for servo power.
Remember; servos typically require 4.8 to 7.2 volts, so don't over-voltage
them - they'll smoke pretty quickly if you do.
John Barrowman
Engineering
Parallax, Inc.
Ryan
--- In basicstamps@yahoogroups.com, "Aristides Alvarez"
<aristidesparallax@y...> wrote:
> Hello Ryan.
>
> The following answer is from the developer of the PSC.
> He's not subscribed to the forum, so I'm posting it for him
>
> Saludos,
> Aristides Alvarez
> Education Manager
> aalvarez@p...
> Parallax, Inc. www.parallax.com
> USA
>
> Hi Ryan,
>
> I can answer your questions regarding the Parallax Servo Controller.
>
> 1) The current version of firmware pulses the servo continuously. We
>
> are working on a version in which you can disable/enable any servo
with a
> serial command. I imagine we will release that version at the end
of this
> month.
>
> 2) Its possible, though untested. First, you would need a supply
that
>
> can deliver 2-3 amps at a voltage suitable for your servos.
>
> Ensure the jumper on the BOE is in the VDD position. This jumper
>
> controls the power supply voltage to the servo controller itself,
so we need
> that at 5 VDC. Servo power must be separate (or as separate as
possible).
> Then, connect VIN and VSS from the BOE to the servo supply
terminals on the
> servo controller. I don't know if this will work or not, but its
the best
> chance you have of using the same
>
> supply for both.
>
> Honestly, you'd be better off using a 9V battery to supply the BOE,
and
> simply connect the wall plug power supply to the terminal for servo
power.
> Remember; servos typically require 4.8 to 7.2 volts, so don't over-
voltage
> them - they'll smoke pretty quickly if you do.
>
> John Barrowman
>
> Engineering
>
> Parallax, Inc.
deliberately dismissing a documented recommendation you will void your
warranty. Proceed with caution.
-- Jon Williams
-- Applications Engineer, Parallax
-- Dallas Office
Original Message
From: LostboY [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=z5Glr-mIGmIF_qe6CwTIIiheC4HTTy6YZ33PCsn73f5eURayj-hlHdDS23GpvfPvnW6cRHSKRubHd4k]hangook21@y...[/url
Sent: Monday, July 12, 2004 11:31 AM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Re: Question about servo controller (#28023)
That is great news. Thanks for the info (I did read the PDF about the
PSC, but it didn't mention if it would continue to pulse for me)
Can you jumper the BOE rev c to the 'input power' for the servo
headers and use those to power the PSC?
Ryan
--- In basicstamps@yahoogroups.com, "Jon Williams" <jwilliams@p...>
wrote:
> The PSC will in fact hold your servo at the last commanded position
by
> sending the proper signals every 20 ms or so. You don't need to
worry
> about refreshing the servos, that's the job of the PSC. When you
want a
> servo to move, send a new position command and the PSC will do
> everything else.
>
> -- Jon Williams
> -- Applications Engineer, Parallax
> -- Dallas Office
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