CMU cam and 7.5 Kgxcm servos don''t work with HomeWork Boards
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Posts: 46,084
Sorry, I missed the fact that the only 5v regulator on the Homework
board is the SMD that is used for the Stamp. What that means is that
you're limited to about 50 mA. If you're powering the CMU cam (which
uses a power-hungry SX chip to do its processing), that could be the
issue.
Sorry I missed that earlier. I have a Homework board in my (Dallas)
office, but I tend to use the NX-1000 and standard BOEs for development
projects.
-- Jon Williams
-- Parallax
Original Message
From: Joe Terk [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=gE7Ck1bnWX608-x156DWLD8h1iSjttyVrTl3dwF53qrv8aCnqEAsgPihlAXWOFJ1NUjBCbDG1QQ]joeterk@y...[/url
Sent: Thursday, August 07, 2003 9:49 AM
To: basicstamps@yahoogroups.com
Subject: RE: [noparse][[/noparse]basicstamps] CMU cam and 7.5 Kgxcm servos don't work with
HomeWork Boards
Thanks Jon,
But, I tried with BS2-IC modules (without capacitors)
and the CMU CAM and the 7.5 Kgxcm servos work fine.
I tried with a second Homework board and
I have the same problems.
Do you think that the Homework board works with
some accesories only?
Perhaps Homework boards have an other modification
(not the 220 ohm resistors only)
Any idea is welcome.
Thanks: Joe
--- Jon Williams <jwilliams@p...> wrote:
> The 220 ohm resistors are probably not the issue.
> The standard BOE has
> caps on the supply that prevent servo surging from
> resetting the Stamp;
> they are not on the Homework board (as there are no
> servo connectors).
> Put a 1000 uF or larger cap between Vdd and Vss and
> I think you'll
> probably see the problem go away.
>
> -- Jon Williams
> -- Parallax
>
>
>
Original Message
> From: Joe Terk [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=gE7Ck1bnWX608-x156DWLD8h1iSjttyVrTl3dwF53qrv8aCnqEAsgPihlAXWOFJ1NUjBCbDG1QQ]joeterk@y...[/url
> Sent: Tuesday, August 05, 2003 9:43 PM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] CMU cam and 7.5 Kgxcm servos
> don't work with
> HomeWork Boards
>
>
> Stampers:
>
> I tried to use a
> CMU cam and 7.5 Kgxcm servos with the HomeWork
> Board
> (item 28158) and they don't work.
>
> Then I used and standard Basic Stamp 2 (item
> BS2-IC)
> whit BASIC Stamp 2 Carrier Board (item 27120) and
> all
> worked fine.
>
> Even I used a second HomeWork Board but I have
> the same problems.
>
> I know that HomeWork Board has 220 resistors
> but is this the problem?
>
> Any help is welcome.
> Thanks: Joe
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board is the SMD that is used for the Stamp. What that means is that
you're limited to about 50 mA. If you're powering the CMU cam (which
uses a power-hungry SX chip to do its processing), that could be the
issue.
Sorry I missed that earlier. I have a Homework board in my (Dallas)
office, but I tend to use the NX-1000 and standard BOEs for development
projects.
-- Jon Williams
-- Parallax
Original Message
From: Joe Terk [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=gE7Ck1bnWX608-x156DWLD8h1iSjttyVrTl3dwF53qrv8aCnqEAsgPihlAXWOFJ1NUjBCbDG1QQ]joeterk@y...[/url
Sent: Thursday, August 07, 2003 9:49 AM
To: basicstamps@yahoogroups.com
Subject: RE: [noparse][[/noparse]basicstamps] CMU cam and 7.5 Kgxcm servos don't work with
HomeWork Boards
Thanks Jon,
But, I tried with BS2-IC modules (without capacitors)
and the CMU CAM and the 7.5 Kgxcm servos work fine.
I tried with a second Homework board and
I have the same problems.
Do you think that the Homework board works with
some accesories only?
Perhaps Homework boards have an other modification
(not the 220 ohm resistors only)
Any idea is welcome.
Thanks: Joe
--- Jon Williams <jwilliams@p...> wrote:
> The 220 ohm resistors are probably not the issue.
> The standard BOE has
> caps on the supply that prevent servo surging from
> resetting the Stamp;
> they are not on the Homework board (as there are no
> servo connectors).
> Put a 1000 uF or larger cap between Vdd and Vss and
> I think you'll
> probably see the problem go away.
>
> -- Jon Williams
> -- Parallax
>
>
>
Original Message
> From: Joe Terk [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=gE7Ck1bnWX608-x156DWLD8h1iSjttyVrTl3dwF53qrv8aCnqEAsgPihlAXWOFJ1NUjBCbDG1QQ]joeterk@y...[/url
> Sent: Tuesday, August 05, 2003 9:43 PM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] CMU cam and 7.5 Kgxcm servos
> don't work with
> HomeWork Boards
>
>
> Stampers:
>
> I tried to use a
> CMU cam and 7.5 Kgxcm servos with the HomeWork
> Board
> (item 28158) and they don't work.
>
> Then I used and standard Basic Stamp 2 (item
> BS2-IC)
> whit BASIC Stamp 2 Carrier Board (item 27120) and
> all
> worked fine.
>
> Even I used a second HomeWork Board but I have
> the same problems.
>
> I know that HomeWork Board has 220 resistors
> but is this the problem?
>
> Any help is welcome.
> Thanks: Joe
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