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Radio cuts out, student's foot run over
We had a somewhat scary incident with our robot yesterday.
Here's what we did:
For the record:
Has anyone else seen anything like this? BTW, the student is fine. |
Re: Radio cuts out, student's foot run over
On your competition port however you wired it. There should be two switches for testing autonomous and disabled, at least that is the way we have it. Now if you flipped the autonomous that is probably why it did that. I know that when we first wired our we got confused as to which was autonomous and which was disable and had our robot take off once and almost take my had off in the process while I was working on the drive train.
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Re: Radio cuts out, student's foot run over
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Our fancy dongle developed a loose connection last fall. If it had failed in a slightly different way, it could easily have thrown the robot into autonomous instead of disabling it. We of course repaired it. |
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Re: Radio cuts out, student's foot run over
Suppose for a second that the wiring on the dongle is faulty and that the robot ran an autonomous program.
Here is our autonomous code that is called from the Autonomous() function in the competition template of EasyC - Pro: Code:
voidI will check the wiring again... but I fail to see how the robot would take off in either of these cases. Also, the student that had been driving the robot was asked multiple times what the state of the kill-switch was... He told me "disabled" every time I asked... I asked 3 times because I saw the LEDs on the speed controller were solid orange, enabled. |
Re: Radio cuts out, student's foot run over
Grant,
I strongly suggest that you report this to IFI. Mike |
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Re: Radio cuts out, student's foot run over
If you feel certain that the robot was disabled at the Operator Interface, for the safety of all of us, please contact IFI immediately.
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Re: Radio cuts out, student's foot run over
We had to robot take off with no user input before with my laptop attached through the programming cable. My fault though. Laptops okay. :)
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Re: Radio cuts out, student's foot run over
Problems with the robot not correctly disabling motors when the radio signal is corrupted have (hopefully) been addressed with new beta test versions of the master code. If you are running the latest master code, and still have these problems, make sure you report it to IFI. They are looking for these reports. It is a good idea to pay careful attention to your radio setup, even without these problems, in that radio glitches would normally cause intermittent robot disablement. Keep track of any posted updates to this master code and install them as they are available.
To minimize radio connection problems (hiding any remaining disablement glitches), make sure that: 1) Your radio is placed as high as you can. 2) Your radio is mounted on plastic about a half wavelength away (5 to 6 inches) from any metal structure on your robot. 3) Your radio will not be shadowed by any large metal panels or closely spaced wire grids. If it is shadowed, the reliability might suffer when the robot is oriented so that the metal panel is interposed between the OI and the RC radio modems. On the OI end, if you mount the radio on a wall, make sure that this wall is not a conducting surface such as metal. The best place for this antenna is in "free space," well clear of metal surfaces (except for a table that it might be sitting on). If you continue to have problems while on the radio, make sure that you report these problems to IFI and use the tether while testing your robot until the problems are resolved. All of the interference effects involved when a metal surface is near the antenna is one of the wonders of nature, but you don't want to be exploring these with your robot. Eugene |
Re: Radio cuts out, student's foot run over
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Re: Radio cuts out, student's foot run over
Also, from our experience, this problem will only get worse in competition mode, not better! Apparently, at lower channel numbers, the radios are worst. (Our team ran through a testing procedure on almost all 40 channels; we have the results if anyone is interested.)
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Very interested Please post |
Re: Radio cuts out, student's foot run over
I will get the information from the students that ran the test and report back. :)
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