Chief Delphi - [Rookie] How to set up electrical the best way?

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- - [Rookie] How to set up electrical the best way? (http://www.chiefdelphi.com/forums/showthread.php?t=99554)

mikets

24-01-2012 02:00

Re: [Rookie] How to set up electrical the best way?

3 Attachment(s)

Quote:

Originally Posted by mikets (Post 1111932)

I am making a 12-port CAN backbone tonight. I will take some pictures to post.

Here are the pictures of the 12-port CAN hub (part 1 of 2).

mikets

24-01-2012 02:01

Re: [Rookie] How to set up electrical the best way?

2 Attachment(s)

Part 2 of 2.

AllenGregoryIV

24-01-2012 03:05

Re: [Rookie] How to set up electrical the best way?

Thanks for the pictures, that doesn't look to complicated. Are any of the parts special or just normal RJ11 stuff?

mikets

24-01-2012 05:02

Re: [Rookie] How to set up electrical the best way?

Those are just normal RJ-11 stuff I got from Home Depot.

bmlarson12

24-01-2012 15:40

Re: [Rookie] How to set up electrical the best way?

One thing I heard of to keep things organized is to mount everything on pegboard. I am going to try that this year.

Another thing to keep cables organized is to use a strip of electrical tape every six inches to hold each pair of wires together. For example, it makes sure that you know the positive and negative wires are going to a specific motor.

Al Skierkiewicz

24-01-2012 15:47

Re: [Rookie] How to set up electrical the best way?

Quote:

Originally Posted by bmlarson12 (Post 1112715)

One thing I heard of to keep things organized is to mount everything on pegboard. I am going to try that this year.

Perf stock aluminum is easier to use and can be cut with a pair of shears.

chi-town-biker

24-01-2012 15:48

Re: [Rookie] How to set up electrical the best way?

Quote:

Originally Posted by bmlarson12 (Post 1112715)

One thing I heard of to keep things organized is to mount everything on pegboard. I am going to try that this year.

Andy Mark perforated polycarbonate board is great. The holes line up with most FRC parts. www.andymark.com/product-p/am-0836.htm

Jon Stratis

24-01-2012 16:00

Re: [Rookie] How to set up electrical the best way?

Quote:

Originally Posted by Al Skierkiewicz (Post 1112718)

Perf stock aluminum is easier to use and can be cut with a pair of shears.

But it's not electrically isolated like a peg board would be :)

kstl99

24-01-2012 17:32

Re: [Rookie] How to set up electrical the best way?

We have had good luck with 1/4" Lexan. Easy to drill and tap and pretty strong.

Al Skierkiewicz

24-01-2012 18:14

Re: [Rookie] How to set up electrical the best way?

Quote:

Originally Posted by eagle33199 (Post 1112725)

But it's not electrically isolated like a peg board would be :)

Everything has a drawback. We have used perf for as far back as I can remember.

Ernst

24-01-2012 18:51

Re: [Rookie] How to set up electrical the best way?

Garolite can be great for mounting electronics. It's very resistant to heat, chemicals, and electricity. It's also very strong.

It has a lot of the properties of carbon fiber, but is much cheaper.

Al Skierkiewicz

24-01-2012 21:42

Re: [Rookie] How to set up electrical the best way?

Mike,
I like that. If we ever go to a can bus can I copy it?

mikets

24-01-2012 21:48

Re: [Rookie] How to set up electrical the best way?

Quote:

Originally Posted by Al Skierkiewicz (Post 1112972)

Mike,
I like that. If we ever go to a can bus can I copy it?

Are you referring to my CAN bus hub? If so, sure. You are welcome to it. There are too many discussions in this thread :) I am very new to CAN bus. So the design is not proven. Our test bot runs fine with the 4-port hub. My limited knowledge on transmission line tells me it shouldn't have any issues with wave reflection.

otherguy

26-01-2012 00:14

Re: [Rookie] How to set up electrical the best way?

Quote:

Originally Posted by mikets (Post 1102395)

Here is our software development bot. It is in a smaller footprint than the competition robot so it is less intimating when testing software. We are trying Jaguars for the first time and we made a backbone CAN bus (not daisy chain so it won't have the problem of one Jag dies, all down stream jags will fail) using RJ-12 connectors. The bus is pretty much two twisted-pair wires punchdown to 4 RJ-12 connectors. Also notice the Anderson connectors for motor power and RJ-11 connectors for the encoders. So unplugging all motor power and encoder cables will allow us to separate the electronics from the frame cleanly.

Just so you know... If a jaguar in a daisy chain fails, down stream jags are NOT affected. The contacts on the PCB are wired through (in to out) without going through active components.

The only exception to the rule is in the case where you are using the Jaguar as an RS232 to CAN bridge... Since that jaguar is actively translating commands, if it fails, the link fails. But again, any other Jag in the chain can lose power and everything will keep operating as it should.

Test it out for yourself - we did.

slijin

26-01-2012 00:22

Re: [Rookie] How to set up electrical the best way?

Quote:

Originally Posted by otherguy (Post 1113713)

Just out of curiosity, how exactly did you conduct this test?

When experimenting with CAN last year, we ran into a Jaguar that terminated the network when the chain reached it (but we've had far more than our share of bizarre Jaguar phenomena).

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