Chief Delphi - Jaguar VS Victor

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Chief Delphi (http://www.chiefdelphi.com/forums/index.php)

- Electrical (http://www.chiefdelphi.com/forums/forumdisplay.php?f=53)

- - Jaguar VS Victor (http://www.chiefdelphi.com/forums/showthread.php?t=94830)

Ether

21-01-2012 21:13

Re: Jaguar VS Victor

Quote:

Originally Posted by Bryscus (Post 1110838)

Sometimes it's just nice to tell a Jaguar to go to a position using a Set() command rather than having to write or use a PID in your code for it. :)

It would be nice if you could do the same thing with speed (in the drivetrain).

Bryscus

21-01-2012 21:18

Re: Jaguar VS Victor

Quote:

Originally Posted by Ether (Post 1110844)

It would be nice if you could do the same thing with speed (in the drivetrain).

Is there some reason one can't?

- Bryce

Ether

21-01-2012 21:19

Re: Jaguar VS Victor

Quote:

Originally Posted by Bryscus (Post 1110852)

Is there some reason one can't?

Have you ever successfully done it?

http://www.chiefdelphi.com/forums/sh...d.php?t=100135

Bryscus

21-01-2012 23:41

Re: Jaguar VS Victor

Quote:

Originally Posted by Ether (Post 1110855)

Have you ever successfully done it?

http://www.chiefdelphi.com/forums/sh...d.php?t=100135

No, we've only used position mode on two different occasions (with some funky coding it worked pretty well for the dynamic system of a two jointed arm and for module orientation on a swerve drive system).

We WERE however, planning on using speed control for the shooter. I guess we'll have to take a good hard look at that one. I didn't realize the background of this...thanks for the heads up.

- Bryce

slijin

22-01-2012 00:25

Re: Jaguar VS Victor

Quote:

Originally Posted by eagle33199 (Post 1103592)

The problem is, you seldom hear about teams using Jags successfully. It's the teams that have problems with them that come and post, so it looks like there's a much larger problem than there actually is.

On the other hand, Jaguars have been proven to be notoriously more unreliable, as evidenced by the high frequency of hardware and software updates. Jaguars also have a much shorter track record than Victors. What's more is that this problem isn't exactly as exaggerated as you see it to be - yes, the bulk of Jaguar posts are about problems/failures, but can you say the same about Victors?

Joe Ross

22-01-2012 00:31

Re: Jaguar VS Victor

Quote:

Originally Posted by slijin (Post 1110996)

yes, the bulk of Jaguar posts are about problems/failures, but can you say the same about Victors?

Yes, the majority of victor posts are people who don't get the PWM cable plugged in properly.

Chris86

22-01-2012 01:19

Re: Jaguar VS Victor

I have a similar question regarding these...

I am a new mentor on a rookie team and I've only ever really worked with Victors. We could really use the smaller footprint/size/durability of the victors, BUT we got 4 Jags and only 1 Victor in our kit and can't afford to buy many more speed controllers (definitely can't buy 7 victors, maybe barely 3).

If our team has 4 Jaguars and 4 Victors, can we use them all on the robot with minimal headaches?
How much additional difficulty would it be programming/wiring/any other considerations to have such a mixed set?

mikets

22-01-2012 01:46

Re: Jaguar VS Victor

If you are using the Jaguars with PWM, it is no different from the Victors in terms of programming. Instead of instantiating a Victor object, you just instantiate a Jaguar object. It would be a little more involve if you operate the Jaguars with CAN bus but the upside is simpler wiring and more functionality (e.g. Can use built-in PID control on position and speed mode, can read the voltage, current, speed and position from the Jaguars etc). Our team has been using Victors in the previous years. We are trying the Jaguar the first time this year. We were afraid of the reliability issue. That's why we hesitated for so long. But eventually we knew we must jump over at a certain point, so might as well now. Hopefully, the added functionalities of the Jaguars are well worth it. If you want to play it on the safe side, you can use a mix of the controllers. We definitely want to use the Jaguars for the shooter because it can potentially do speed control (if we can tune the built-in PID to give us a stable speed). We also plan the code such that we can easily switch back to Victors if we have to (e.g. Jags failing during competition).

carrillo694

22-01-2012 02:02

Re: Jaguar VS Victor

Quote:

Originally Posted by mikets (Post 1111030)

But eventually we knew we must jump over at a certain point, so might as well now.

Until Jaguars are demonstrated to be as reliable as Victors in intensive applications such as drivetrains, there won't be an eventually for me :)

Quote:

Originally Posted by mikets (Post 1111030)

We definitely want to use the Jaguars for the shooter because it can potentially do speed control (if we can tune the built-in PID to give us a stable speed). We also plan the code such that we can easily switch back to Victors if we have to (e.g. Jags failing during competition).

Our team is employing the exact same strategy. We anticipate that, because our shooter will only ever run in one direction and will not rapidly change speed, there is not much chance that these Jaguars will actually fail. But we are also developing a Victor-based speed controller in code as well, to hedge against the risk of Jaguar failure.

Ether

22-01-2012 08:33

Re: Jaguar VS Victor

Quote:

Originally Posted by mikets (Post 1111030)

We definitely want to use the Jaguars for the shooter because it can potentially do speed control (if we can tune the built-in PID to give us a stable speed).

There's a recent thread about using the Jag's built-in speed control:
http://www.chiefdelphi.com/forums/sh...d.php?t=100135

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