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Unread 23-06-2002, 23:29
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Loss of signal in PWM cables.

Posted by Michael at 1/23/2001 10:36 AM EST


Other on team #271 from Bay Shore High School and Verizon.



Hey y'all . . .
This is my first post to this forum, but I've got a question that I haven't really been able to find an answer for.

Has anyone suffered any problems with their PWM cables with respect to signal loss? We've (We being team #271) got to run a PWM cable to a servo at the end of a long arm, and we'll need some ridiculous amount of cable. . .something like 12'. Being that the wire is so small in diameter, I was worried about internal resistance and all, and wondering if the signal would get that far.

Any advice?


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Re: Loss of signal in PWM cables.

Posted by Anton Abaya at 1/23/2001 11:35 AM EST


Coach on team #419, Rambots, from UMass Boston / BC High and NONE AT THE MOMENT! .


In Reply to: Loss of signal in PWM cables.
Posted by Michael on 1/23/2001 10:36 AM EST:



: Hey y'all . . .
: This is my first post to this forum, but I've got a question that I haven't really been able to find an answer for.

: Has anyone suffered any problems with their PWM cables with respect to signal loss? We've (We being team #271) got to run a PWM cable to a servo at the end of a long arm, and we'll need some ridiculous amount of cable. . .something like 12'. Being that the wire is so small in diameter, I was worried about internal resistance and all, and wondering if the signal would get that far.

: Any advice?

wow...that's far. I cannot really say we've tried it ourselves, but why dont you try it? just hook up a motor to the end of a looong pwm cable. see what happens .

post back the results ....

-anton
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Re: Loss of signal in PWM cables.

Posted by Michael "Special K" Krass at 1/23/2001 2:33 PM EST


Other on team #271, Mechanical Marauders, from Bay Shore High School and Verizon.


In Reply to: Re: Loss of signal in PWM cables.
Posted by Anton Abaya on 1/23/2001 11:35 AM EST:




: wow...that's far. I cannot really say we've tried it ourselves, but why dont you try it? just hook up a motor to the end of a looong pwm cable. see what happens .

: post back the results ....

Yep, it's really far. I would have hooked it up long ago, if we had a PWM cable that was even remotely that long.

I'll see what I can't work out this afternoon, and I'll fill you all on what happens. If I don't ever return, it's probably safe to say that the results were catastrophic :-).

- Michael, who's ought not be afraid of a little servo, should he?


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Re: Loss of signal in PWM cables.

Posted by Michael Betts at 1/23/2001 11:56 AM EST


Engineer on team #177, Bobcat Robotics, from South Windsor High School and International Fuel Cells.


In Reply to: Loss of signal in PWM cables.
Posted by Michael on 1/23/2001 10:36 AM EST:



: Hey y'all . . .
: This is my first post to this forum, but I've got a question that I haven't really been able to find an answer for.

: Has anyone suffered any problems with their PWM cables with respect to signal loss? We've (We being team #271) got to run a PWM cable to a servo at the end of a long arm, and we'll need some ridiculous amount of cable. . .something like 12'. Being that the wire is so small in diameter, I was worried about internal resistance and all, and wondering if the signal would get that far.

: Any advice?

Michael,

The servo is an extremely low current signal. Signal loss should not be a problem. I would suggest trying it first before committing to a design.

An alternative is to cut a PWM cable in half and splice a larger AWG for the majority of the run.

Mike


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Re: Loss of signal in PWM cables.

Posted by Justin Stiltner at 1/23/2001 12:05 PM EST


Student on team #388, Epsilon, from Grundy High School and NASA, American Electric Power, Town of Grundy.


In Reply to: Re: Loss of signal in PWM cables.
Posted by Michael Betts on 1/23/2001 11:56 AM EST:



: : Hey y'all . . .
: : This is my first post to this forum, but I've got a question that I haven't really been able to find an answer for.

: : Has anyone suffered any problems with their PWM cables with respect to signal loss? We've (We being team #271) got to run a PWM cable to a servo at the end of a long arm, and we'll need some ridiculous amount of cable. . .something like 12'. Being that the wire is so small in diameter, I was worried about internal resistance and all, and wondering if the signal would get that far.

: : Any advice?

: Michael,

: The servo is an extremely low current signal. Signal loss should not be a problem. I would suggest trying it first before committing to a design.

: An alternative is to cut a PWM cable in half and splice a larger AWG for the majority of the run.

: Mike

I think you may want to look at some 3 conductor sheilded wire. and solder this to the connectors on each ends and connect the shield to the NEG - side of the battery to reduce noise in the line. whatever you do tho you should solder all the connections Except on the controller and the servo.

Good Luck and tell us how it comes out
Justin Stiltner
Team #388
Epsilon
Grundy VA,

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Re: Loss of signal in PWM cables.

Posted by Michael at 1/23/2001 2:22 PM EST


Other on team #271, Mechanical Marauders, from Bay Shore High School and Verizon.


In Reply to: Re: Loss of signal in PWM cables.
Posted by Justin Stiltner on 1/23/2001 12:05 PM EST:



Thanks for the quick responses!

I hadn't even considered splicing in a larger wire. I'm not an electrical genius, if you couldn't tell. I like pulleys and other mechanical things that I can see working.

Anyway, thanks again for the help.

- Michael, off to formulate a new plan, just in case we do lose the signal.





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Unread 23-06-2002, 23:29
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if you like pulleys...

Posted by Ken Leung at 1/23/2001 4:01 PM EST


Student on team #192, Gunn Robotics Team, from Henry M. Gunn Senior High School.


In Reply to: Re: Loss of signal in PWM cables.
Posted by Michael on 1/23/2001 2:22 PM EST:



If you like pulleys and other mechanical things, then why don't you try solving this problem this way? Sometimes there are different solution for a problems, and in this case, I can imagine one that might work.

Instead of mounting the servo at the end of the arm, you mount the servo on the other end of the arm near the body, or where ever the pwm cable will reach to. Then you attach those little plastic extensions thing that you can attach on the servo at the other end of the arm, and have a long wire or string connecting between them, use pulleys if necessary. This way, when the servo spin on this end of the arm, the other end will be pulled by the servo and also spin... The only worry about this is the efficiency of the whole setup, if you don't do it well you are going to lose power from the servo, and they are already weak enough.


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