 | | Surveying MTBF of Edu NXTs
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I have 11 commercial (C) and 25 educational (E) NXT sets. The 11Cs are doing fine after about 4 battery changes. They have been in use since July 2006 for about 60 class hours. I'm sure there's a more empirical way to calculate how much run-time 4 (...) (18 years ago, 23-Feb-07, to lugnet.robotics.nxt)
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| | Re: Surveying MTBF of Edu NXTs
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(...) What exactly do you mean by "Dead"? I've never seen any NXTs die. I've been told it's possible to reprogram the flash memory enough to wear it out, but that required someone writing a PC program that did nothing but reprogram the flash, and (...) (18 years ago, 23-Feb-07, to lugnet.robotics.nxt)
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| | Re: Surveying MTBF of Edu NXTs
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(...) You should be able to estimate time-to-failure in the presence of your censored data; people do this all the time in engineering and cancer and many other fields. Steve H seems surprised at the fact that any NXT died and I must say that I am (...) (18 years ago, 23-Feb-07, to lugnet.robotics.nxt)
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| | Re: Surveying MTBF of Edu NXTs
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(...) Hi Fly, I suspect that your NXTs are fine. On the other hand, I suspect your rechargeables are toast; there is a big difference between those two things. An underpowered NXT will behave erratically, and therefore, as the battery looses its (...) (18 years ago, 23-Feb-07, to lugnet.robotics.nxt)
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| | Re: Surveying MTBF of Edu NXTs
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First, let me repeat the request for specifics. I *have* had some reports of indivdual sensors failing (and being replaced by LEGO), as well as the rare motor that seems a little bit to high in internal friction (and, again, at least addressed by (...) (18 years ago, 23-Feb-07, to lugnet.robotics.nxt)
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| | Re: Surveying MTBF of Edu NXTs
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(...) Two 6th grade girls at Ladd Acres Elementary in Hillsboro Oregon USA, named the NXT, "OOBER" out of the box. They used a rechargeable until that needed recharging. I replaced their original rechargeable with another one. Today, about 30 (...) (18 years ago, 24-Feb-07, to lugnet.robotics.nxt)
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| | Re: Surveying MTBF of Edu NXTs
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(...) It sounds to me like the NXT is simply in firmware download mode. There is no visible reaction on the NXT once it is in that mode but you should hear a faint clicking sound. That's what the reset button does - i.e., it puts the NXT into (...) (18 years ago, 24-Feb-07, to lugnet.robotics.nxt)
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| | Re: Surveying MTBF of Edu NXTs
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(...) Ouch, I understand quite well, actually*. But I agree with John, it sounds like the NXT might be in firmware update mode. If you *haven't* already done it, download the latest firmware (1.04), and a patch for the driver (1.02), from LEGO's (...) (18 years ago, 24-Feb-07, to lugnet.robotics.nxt)
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| | Re: Surveying MTBF of Edu NXTs
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(...) Thanks Folks. I'm just finishing up a class for 9 & 10 year olds. When I get home, I'll try resetting and upgrading OOBER. Without the tears and emotions breaking around me, I should be able to isolate the bug. (18 years ago, 24-Feb-07, to lugnet.robotics.nxt)
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| | legWay
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Steve H. 's legway, needless to say, is very cool. I wonder if I may obtain expertise ideas on the following: . I wonder if anyone has tried this with the regular RCX sensors + Robolab2.9.2 using the Optimizer feature. The Optimizer is supposed to (...) (18 years ago, 24-Feb-07, to lugnet.robotics.nxt)
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| | RE: legWay
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(...) I can't speak for what actually got implemented. But Robolab's 2.9.2 firmware has almost all of the same features as the RobotC firmware. This includes the capability to customize the sensor scan rate from the default of 3 msec. The scan rate (...) (18 years ago, 25-Feb-07, to lugnet.robotics.nxt)
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