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(...) Within the same room - is unlikely to be a problem - but think about two Sumo bots trying to find each other or two robots doing some kind of cooperative tasks in a contest or something...not likely to be so easy I think. (19 years ago, 22-May-06, to lugnet.robotics)
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| | Re: Ultrasonic sensor interactions
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(...) I'm not positive of that. If the US sensor is plugged in to a powered NXT, I can detect a clicking from it - I presume it's on. Regardless of what sensor I define the port as, this clicking continues. This is what I was basing my "can't turn (...) (19 years ago, 21-May-06, to lugnet.robotics)
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| | External power supply for NXT
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Hi all, You'll find (URL) here> detailed building instructions for a replacement battery plate that adds an external power jack to the NXT. (URL) Enjoy, Philo (19 years ago, 21-May-06, to lugnet.robotics, FTX)
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| | Re: Ultrasonic sensor interactions
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Hello Brian, (...) That's easy to do in NBC, and not hard with NXT-G: to shut off the US sensor, just "use" another sensor type on the same port. Here is a sample program that switches the US sensor on/off with NXT enter button. (URL) If the sensor (...) (19 years ago, 21-May-06, to lugnet.robotics)
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| | Re: Ultrasonic sensor interactions
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I've heard of one possible answer, though don't know if it is feasible on the NXT. If the robot software sends timed pings, regardless of time of flight, they will be returned with the same delay between them. So if you send two pings 73 msecs (...) (19 years ago, 21-May-06, to lugnet.robotics)
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| | Re: Ultrasonic sensor interactions
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(...) I was the one that mentioned that I couldn't find a way from the SW I have to turn the US sensor off. That said, I don't think it's time yet to worry about intractable problems: A hundred of us or so have been playing with this stuff for a (...) (19 years ago, 21-May-06, to lugnet.robotics)
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| | Re: Ultrasonic sensor interactions
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(...) Wow! That's a lot lower than I'd have expected - at that frequency there is a good risk of harmonics from normal sound interfering with it. (...) Right - 350 meters per second is pretty slow by computer standards. (...) (Not to mention things (...) (19 years ago, 21-May-06, to lugnet.robotics)
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| | Re: Ultrasonic sensor interactions
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(...) The device operates at 40kHz, the transmit and receive piezo devices are only resonant at that frequency. Even though the measurement period is short (time from transmit to time to receive) it is necessary to wait quite a while for the sound (...) (19 years ago, 21-May-06, to lugnet.robotics)
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| | Re: Ultrasonic sensor interactions
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(...) The 'Aloha' protocol was the predecessor of this. (...) Someone earlier told us that the thing runs all the time and can't even be shut off. That being the case, I think we're pretty much doomed. (...) Yes - but the relatively low frequency at (...) (19 years ago, 21-May-06, to lugnet.robotics)
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| | Re: Ultrasonic sensor interactions
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(...) How about a single computer that was Bluetooth accessable. The server could act as a "lockable" resource that a NXT could acquire prior to doing the US detection. Then the NXTs don't need to know about each other, just the main server (and it (...) (19 years ago, 21-May-06, to lugnet.robotics)
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