Re: Network Switch
 

Make sure you follow the rules for reusing manufactured stuff. For code, it is easy: Post it. For actual hardware, it may need to be available to everyone.

You could post the design, and then quickly make them at the beginning of each build season. That would save redesign time.

Re: Network Switch
 

You could always measure position with an encoder instead. Just start the elevator at the bottom at the beginning of the match, and then count rotations as it goes up and down. Have a recalibrate feature if anything goes wrong so you manually drop the elevator to the bottom and re-zero.

Re: Network Switch
 

Last year we did this and we ran into a number of issues with our encoders not being calibrated during autonomous. Based on our autonomous strategy this year, we decided that having to slowly lower the elevator until a limit switch was pressed wasn't super feasible.

Re: Network Switch
 

Sam,
Please ask on the Q&A before you spend a lot of time developing. CAN buss is a relatively stable easy to use system if you are careful with the wiring. This is something you are going to do even if you stick with the LAN solution. I have one personal rule that you should consider. I never put solid wire on a moving device if I can help it. Solid wire tends to break when you need it the most due to vibration. For the LAN wiring on the robot we tie everything down so there is a minimum of movement and add some service loop so nothing is stressed. I have seen teams lose elim matches due to failed LAN wiring.
I would also ask, if you couldn't add the sensors to the non-moving side of the lift so that you don't have to worry about buss wiring that will fail.

Re: Network Switch
 

Could you clarify what you mean here?

Re: Network Switch
 

From your description it sounds as if you plan to mount the sensors on the moving part of your mechanism. Could you add those to a non-moving section and have the bar codes mounted on the moving parts?

Re: Network Switch
 

I see what you are saying. At first glance it doesn't seem possible but I will delve into it a bit and think it through more.

Re: Network Switch
 

One thing I like about this year's control system is that it forces teams to tether to the router. Cheaper to replace when someone trips over the tether wire.

Note that Ethernet patch cables are commonly made with stranded wire, which addresses some of Al's concerns. If I was building out a LAN on the robot, consider using fresh-out-of-the-bag stranded patch cables for wiring, rather than solid wire intended for fixed installations. They are very inexpensive.