Go to Post Yeah After we decided not to do autonomous, the robot took matters into it's own hand. i'd bet it would get it's self DQ'd... or an award. - GMKlenklen [more]
Home
Go Back   Chief Delphi > Technical > Electrical
CD-Media   CD-Spy  
portal register members calendar search Today's Posts Mark Forums Read FAQ rules

 
Closed Thread
Thread Tools Rate Thread Display Modes
  #16   Spotlight this post!  
Unread 16-02-2004, 06:27
jacob_dilles's Avatar
jacob_dilles jacob_dilles is offline
Registered User
AKA: theshadow
FRC #0620 (WarBots)
Team Role: Mentor
 
Join Date: Jan 2003
Rookie Year: 2003
Location: Vienna, VA
Posts: 245
jacob_dilles will become famous soon enough
Send a message via AIM to jacob_dilles
Re: Speed Controller brake/coast setting

Quote:
Originally Posted by KenWittlief
where do you get these free relays from?

I will take 10 million please :c)

if you are talking about the relay spikes that are in the KOP - you cannot use those to control the brake pins - the spikes put out 12V switched plus or minus, and they need power on their input (+12V) to work. they dont get their power from the PWM cables.
i wouldent use a spike unless you wanted to ensure there was some rostin electronics! you can pick up a 5v relay at radioshack for 3.99... or if you wana get realy fancy check out digikey for a huge selection
__________________
--------------------------
"You're not a real programmer until all your sentences end with semicolons;"
  #17   Spotlight this post!  
Unread 16-02-2004, 08:19
andy's Avatar
andy andy is offline
Alumni
FRC #1139 (Gear Grinders)
Team Role: Student
 
Join Date: Jan 2003
Location: Atlanta
Posts: 94
andy is a jewel in the roughandy is a jewel in the roughandy is a jewel in the rough
Send a message via AIM to andy
Re: Speed Controller brake/coast setting

Hmmmm.....
Our team tried this last year, we had a set of pedals that acted like "brakes"
The way they worked was they overrided every signal and applied electronic brakes. That way, if we needed to stop, even if the joysticks were pushed all the way down, we could hit the brakes and the robot would come to a stop.
I built a relay box, that had four SPDT relays in it that were controlled simultaneously by a SPIKE.
As far a leagality is concerned... We asked the Q&A and got an ambiguous answer... I will see if I can find the exact response. If time permits we plan on doing the same this year. But instead of four realays we have one 4PDT relay we will use.

Good luck!
-Andy
  #18   Spotlight this post!  
Unread 16-02-2004, 09:07
Unsung FIRST Hero
Al Skierkiewicz Al Skierkiewicz is offline
Broadcast Eng/Chief Robot Inspector
AKA: Big Al WFFA 2005
FRC #0111 (WildStang)
Team Role: Engineer
 
Join Date: Jun 2001
Rookie Year: 1996
Location: Wheeling, IL
Posts: 10,798
Al Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond repute
Re: Speed Controller brake/coast setting

Quote:
Originally Posted by andy
Hmmmm.....
Our team tried this last year, we had a set of pedals that acted like "brakes"
The way they worked was they overrided every signal and applied electronic brakes. That way, if we needed to stop, even if the joysticks were pushed all the way down, we could hit the brakes and the robot would come to a stop.
I built a relay box, that had four SPDT relays in it that were controlled simultaneously by a SPIKE.
As far a leagality is concerned... We asked the Q&A and got an ambiguous answer... I will see if I can find the exact response. If time permits we plan on doing the same this year. But instead of four realays we have one 4PDT relay we will use.

Good luck!
-Andy
Andy,
Bad news...Last year and this year are not very much different in use of the custom circuit board....
5.2.8 Custom Circuit Rules
<R50> The use of additional electronics is intended to allow teams to construct custom circuits for their robots.
The custom circuits may be used to indirectly affect the robot outputs, by providing enhanced sensorfeedback to the Robot Controller to allow it to more effectively decide how to control the robot. The custom circuits must draw power from a 20A circuit breaker. Smaller value fuses may be incorporated into the custom circuits for additional protection. All outputs from the custom circuits must be connected to the analog inputs,digital I/O, TTL Serial Port, or Program Port on the Robot Controller.

The way I read that, a custom circuit may not talk to a speed controller. If I were to inspect your robot last year, I would have had to rule against you. Sorry.
The same rule applies for the use of relays that are driven by spikes. The answer in a nutshell is "NO".
__________________
Good Luck All. Learn something new, everyday!
Al
WB9UVJ
www.wildstang.org
________________________
Storming the Tower since 1996.
  #19   Spotlight this post!  
Unread 16-02-2004, 11:45
Phil_Lutz's Avatar
Phil_Lutz Phil_Lutz is offline
Phil Lutz
#0851 (Froggers)
Team Role: Mentor
 
Join Date: Jan 2004
Location: El Segundo, CA
Posts: 67
Phil_Lutz is on a distinguished road
Send a message via Yahoo to Phil_Lutz
Re: Speed Controller brake/coast setting

Quote:
Originally Posted by Kevin Sevcik
The servo method does have one thing going for it. The servo should stay in position after power is cut to your robot. I think. I'm not an electronics guy on the robot, but if the power to the servo gets cut then it will definitely stay in position.
The Servo will not move if there is no force applied to it on power-down.
We are using a servo to hold a brake mechanism for our winch. When power off occurs, the spring tension will rotate the servo to a non stressed position.

For the purposes of activating a switch, the servo will not be "loaded' and therefore work for you.

Phil

(PS. I fly R/c planes and gliders so I know servos
  #20   Spotlight this post!  
Unread 28-02-2004, 01:52
tenfour's Avatar
tenfour tenfour is offline
Registered User
AKA: Chris
#0696 (The Circuit Breakers)
Team Role: Mentor
 
Join Date: Dec 2002
Location: La Crescenta
Posts: 137
tenfour will become famous soon enough
Send a message via AIM to tenfour
Re: Speed Controller brake/coast setting

How do I connect a wire to the brake pins on the Victor 884? I need like a jumper on a wire. I assume also that the default for the jumpers is to coast. That is that if it sees no jumper at all, it will coast.
__________________
-2004 Arizona Regional Finalists (thanks 80 and 498)
-2004 Arizona Regional Sportsmanship Award
-2003 Los Angeles, CA Regional Finalists
-2003 Phoenix, AZ Regional Semifinalists
-2003 Phoenix, AZ Regional 3rd Seed.
-2002 Los Angeles, CA Regional Semi-Finalists
-2001 Los Angeles, CA Regional Semi-Finalists


FIRST Mantra - When Lawyer-ism fails, Gracious Professionalism Prevails.
(Yes, it is "BCR Orange")
  #21   Spotlight this post!  
Unread 28-02-2004, 10:17
steven114 steven114 is offline
Programming Wizard and Team Captain
AKA: Steven Schlansker
FRC #0114 (Eaglestrike)
Team Role: Programmer
 
Join Date: Feb 2004
Location: Los Altos, CA
Posts: 335
steven114 is a jewel in the roughsteven114 is a jewel in the roughsteven114 is a jewel in the rough
Send a message via AIM to steven114
Re: Speed Controller brake/coast setting

Nope, the default is brake, and the Victors come with a jumper. If you need to extend that, I would suggest using one of the triple-wire data cables that are used to hook up the spikes and victors. I think it'll fit.
  #22   Spotlight this post!  
Unread 03-03-2004, 13:05
The Lucas's Avatar
The Lucas The Lucas is offline
CaMOElot, it is a silly place
AKA: My First Name is really "The" (or Brian)
FRC #0365 (The Miracle Workerz); FRC#1495 (AGR); FRC#4342 (Demon)
Team Role: Mentor
 
Join Date: Mar 2002
Rookie Year: 2001
Location: Dela-Where?
Posts: 1,564
The Lucas has a reputation beyond reputeThe Lucas has a reputation beyond reputeThe Lucas has a reputation beyond reputeThe Lucas has a reputation beyond reputeThe Lucas has a reputation beyond reputeThe Lucas has a reputation beyond reputeThe Lucas has a reputation beyond reputeThe Lucas has a reputation beyond reputeThe Lucas has a reputation beyond reputeThe Lucas has a reputation beyond reputeThe Lucas has a reputation beyond repute
Send a message via AIM to The Lucas
Re: Speed Controller brake/coast setting

Quote:
Originally Posted by steven114
Is it possible to control the brake/coast setting on the 884s with the digital out pins? I didn't want to try anything, as I believe a 1 is +5v. Will I damage anything by using this to select between brake and coast on the fly?

Thanks,
Steven
This question was answered in the Q&A today (ID: 893):

Quote:
Q: Can a digital output of the Robot Controller be connected to the B pin of the Brake/Coast selector on the Victor 884 in order to control the Brake and Coast functions of the Victor?
A: No. There are possible ground loop problems associatedwith this approach.
Unfortunately, the answer is no. You can’t legally wire a digital out to the Victor, but it might work. Ground loop problems are tricky and usually produce noise. They usually occur in audio/video systems.

You could probably stare at Victor 884 and RC schematics for hours debating about whether a ground loop problem would exist. Basically, the digital out current leaves the RC and must return to ground through the Victor (instead of the RC), thus creating a ground “loop”. This could possibly be solved by connecting the ground pin of the digital out to the A pin (which is grounded) of the Victor, but this depends on the internal wiring of the Victor and could produce problems of its own. It really doesn’t matter. FIRST said we can’t use this method and that is all that matters.
__________________
Electrical & Programming Mentor ---Team #365 "The Miracle Workerz"
Programming Mentor ---Team #4342 "Demon Robotics"
Founding Mentor --- Team #1495 Avon Grove High School
2007 CMP Chairman's Award - Thanks to all MOE members (and others) past and present who made it a reality.
Robot Inspector
"I don't think I'm ever more ''aware'' than I am right after I burn my thumb with a soldering iron"
Closed Thread


Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
How do you connect the speed controller fans? Iain Electrical 7 31-01-2003 07:05
Speed controller fan replacement Rickertsen2 Electrical 11 16-01-2003 08:46
Speed Controller Limits yaman Technical Discussion 11 15-01-2003 18:40
Ugh...PWM pin vs. Speed Controller archiver 2001 1 24-06-2002 00:27
making speed controller digital CharlieWilken Electrical 4 01-03-2002 20:15


All times are GMT -5. The time now is 14:02.

The Chief Delphi Forums are sponsored by Innovation First International, Inc.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Copyright © Chief Delphi