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Unread 06-03-2011, 12:09
Matt Krass's Avatar
Matt Krass Matt Krass is offline
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Re: Possible FLR Hacking?

Quote:
Originally Posted by BrandonD-1528 View Post
I realize that 10 volts is low (someone on our team put the wrong tag on it), but it was a little unusual to see a robot lose connection right at the beginning and regain it immediately when the match ends.
........
Of course, it turned out that the wifi in the gym there was interfering with FMS.
Two points here, first, as mentioned earlier at 10V it would be very easy for the startup current of a robot coming to life to cause the radio to suddenly lose power, and the radios restart and reconnect time is roughly the span of a match. Its not unusual at all, it's somewhat expected. Plus a battery at 10V after robot start is probably very near dead and is giving you 'false hope' readings because its under very little load. I can understand why at first glance, this doesn't seem to be a problem, but I assure you it is a problem.

Second point, I've seen wireless networks with 20+ computers on them, actively operating in very close proximity for months at a time (ever see what happens on a college campus?) with no interference problems. The WiFi system employed by the field and robots should not succumb to the presence of one local ad-hoc network, it would never have been so successful in the household market.

Unfortunately I think at this point you guys have to suspect a problem on your end, I know it's not pleasant. I've been in the shoes of "it couldn't possibly be our fault, the field/wifi/arena/other team is messing with us" but I can assure you every single time the culprit has been less sinister. I urge you to take this experience and try to fine tune out any bugs in your system, and do whatever you can to make it more robust. This is the first contact for many of these systems and weird, new bugs are expected.

Matt
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I'm a FIRST relic of sorts, I remember when we used PBASIC and we got CH Flightsticks in the KoP. In my day we didn't have motorized carts, we pushed our robots uphill, both ways! (Houston 2003!)
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