August 22, 2017, 06:27:30 pm
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Progress Reports / Re: Team Brain Damage
« Last post by Koolaid64 on August 18, 2017, 09:31:41 pm »
you had me worried there for a bit
-Kyle
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Progress Reports / Re: Team Brain Damage
« Last post by zacodonnell on August 18, 2017, 06:36:50 pm »
I'm in now. Thanks for the reminder!

Zac
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Progress Reports / Re: Team Brain Damage
« Last post by Koolaid64 on August 18, 2017, 03:01:52 am »
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Questions / Re: What Dream parts would you choose for a heavy weight?
« Last post by SuckerPunchRobotics on August 17, 2017, 11:14:08 pm »
Thanks, in my other hobby the boards are always active. We have a game plan but ones always a little apprehensive when choosing a drive and ESC system that they've never used. BIMBA looks like they sponsor us again so that's good. New team members after 14 yrs of being dormant!  Saying thing have changed in these last 14 years is an understatement!  Thanks for the tip. Be safe. Pat
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Questions / Re: What Dream parts would you choose for a heavy weight?
« Last post by AmbientChaos on August 17, 2017, 06:47:42 pm »
This forum isn't especially active all the time, it mostly gets busier right before one of the bigger competitions.  You might try the Facebook Combat Robotics group, it's pretty active and helpful.
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Questions / What Dream parts would you choose for a heavy weight?
« Last post by SuckerPunchRobotics on August 16, 2017, 12:49:06 am »
We are building a new heavy weight and I want to know what each one of you would put in it? Don't worry about money just pretend you have a "Blank Check" and you can have the best. So what's your best motors, drive train, wheel, treads, speed controllers, pneumatics, electronics, radios and batteries. Armor will be titanium grd 5 with a powerful high-pressure pneumatic weapon so dream big here to boys!

Dream big and please indulge us as to why you picked these products and/or designs. Dream big BUT remember it has to fit in a 250 lb. bot.


REVISED-

COME ON BUILDERS !!! Why are there no replies? Does no one have a wish list? Does no one here build heavy weights? Really disappointed in the lack of answers or opinions.
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Progress Reports / Re: Team Brain Damage
« Last post by zacodonnell on August 13, 2017, 12:37:00 pm »
 The board is definitely damaged. That is almost definitely the cause of the symptoms that I experienced. My trouble is figuring out how it happened and how to make that particular thing not happen again so I can find whatever the next failure in the system is.  Either way it should be fun, and I have a feeling Jerry Clark and it's gonna show me why pneumatic flippers driven by someone with a clue dominate silly fly wheel powered flippers driven by an old-school spinner builder.
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Progress Reports / Re: Team Brain Damage
« Last post by rcjunky on August 13, 2017, 12:32:06 pm »
Spec'ing components is something I'd ask Charles about, he can probably guide you in the right direction. Sounds like you're on the right track though if the same board had similar issues in Shuttle as it did at the end of moto.
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Progress Reports / Re: Team Brain Damage
« Last post by zacodonnell on August 12, 2017, 11:09:56 am »
I don't think I'll have any major mechanical upgrades to Magneato for Franklin. In the two fights where the control system was working properly it performed great. It self-righted reliably, was very mobile, and the trigger worked well.  The only thing I'd like to investigate more in the trigger is the arm position sensor. I would like to polish up the light-sensor mount (instead of the ghetto ziptie setup I did the day before the show) or maybe add an encoder or magnetic switch to the arm so I know when to disengage. I'm thinking something like this might work:
http://www.kr4.us/Magnetic-Door-Switch-Set.html?gclid=CjwKCAjwzrrMBRByEiwArXcw28uN1OJMyRSMGHK-B3yOiD8W8U8roYkwd5VdBZ269X5qd9d7WHPIyBoCNIIQAvD_BwE

As far as the problems getting the flywheel to work reliably, I'm 99% sure that is an issue with the Arduino nano control board. When I was trying to get it to work for Shuttle Launch I spent a few hours trying to debug a complicated failure behavior where it would work if only the throttle was plugged in, but as soon as I plugged the trigger channel into the receiver the throttle would go to zero.  I think something happened to the circuits inside the controller that's causing a bad connection somewhere.  I can just swap the nano out, but I need to figure out what happened. I doubt it was shock loading but it is possible.

My best guess is that it has something to do with electrical feedback from the giant magnet running the clutch. I think it might have eventually toasted my flyback diode and then proceeded to damage the rest of the control hardware.  I don't know enough about electrical engineering to even know how to test something like that. Anybody have any suggestions?  The magnet draws ~5A @ 18v when it is on, and is about a pound of copper windings. I'm guessing there is a very large voltage spike when I turn it off. It damaged one of the little toggle switches I was using during my tests before I put a little diode on the leads. Can somebody recommend a specific diode for this?

-Zac
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