Subject:
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Re: Philo's remote and spy rover
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 29 Jan 2007 10:20:04 GMT
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Viewed:
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3352 times
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In lugnet.robotics, Brian Davis wrote:
> I just ran across these on LEGO's NXTlog: A little Spy rover and a
> joystick-based remote control:
>
> http://philohome.com/nxtjoystick/joystick.htm
> http://philohome.com/nxtrover/rover.htm
>
> First - nice job Philo! I like the ball caster (OK, I'll admit bias)
Oh - really??? ;o)
> , but I
> really like using a mechanical linkage to pan the US sensor to widen the FOV.
> Have you tried using the encoder position modulo 360 degrees so that the program
> knows which way the US sensor is looking when it "sees" something?
That's something I considered, but not tried. One problem I foresee is that the
fov of the US-sensor itself is relatively wide, so I don't know if this could
provide much more obstacle direction information.
> And have you
> tried mounting the camera on a third motor to allow up/downn pans?
Not yet. I originally planned to use the third motor port to power the camera.
But since it doesn't work (at least with NiMH) I could try that... (will need to
add a third encoder on my remote too ;o)
> On the remote control, again nice job: I tried a bunch of gearing, and was never
> able to engineer out enough slop to make me happy (and now I'm so used to
> two-paddle steering, that I suspect I'll never "make the switch" to a joystick),
> so I like the "no gears" solution you promote. I've got to ask about your
> timings of the BT messaging back and forth. You mention that "switching back and
> forth" slows things down. Is it switching back and forth (between master-sending
> and slave-sending) that is slowing things down, or is it simply the lag inherent
> in slave-sending (the slave has to wait until polled by the master for pending
> messages)? And if so, how did you test the timings?
I didn't test the timings. Just noticed that my control was very sluggish when I
used the return path. But I need to make a new try: I just notice that my
joystick was built around my MDP NXT prototype - and that can make a
difference!!!
Philo
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Message has 1 Reply:
 | | Re: Philo's remote and spy rover
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| (...) As a first cut, I was thinking of using the position information to determine if the detected target was most likely to the left or the right of the direction of travel. Just to determine the "best" direction to turn to avoid the target. It (...) (18 years ago, 29-Jan-07, to lugnet.robotics)
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Message is in Reply To:
| | Philo's remote and spy rover
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| I just ran across these on LEGO's NXTlog: A little Spy rover and a joystick-based remote control: (URL) - nice job Philo! I like the ball caster (OK, I'll admit bias), but I really like using a mechanical linkage to pan the US sensor to widen the (...) (18 years ago, 29-Jan-07, to lugnet.robotics)
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