Subject:
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Re: ReMix of LEGO NXT Starter Robot
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Newsgroups:
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lugnet.robotics.nxt
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Date:
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Mon, 15 Jan 2007 20:24:08 GMT
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Viewed:
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11222 times
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Hi Chris,
"Chris Phillips" <drvegetable@comcast.net> writes:
>
> It would seem that the motors are controlled using digital
> command packets sent over an I2C interface, and the actual
> motor control waveforms are generated internally to the
> servo motor unit itself.
that is not quite right, there is an ATMEGA48 microcontroller
insider the NXT Brick which generates the waveforms.
It is connected to the main processor via an I2C-style interface.
Besides that it also controls power to the NXT, legacy sensors
and firmware reset.
> The NXT connector also has two lines that are basically
> RCX-compatible I/O lines.
Yes, on sensor ports these are used for legacy sensors
via adapter cables 8528 and also for some NXT sensors (touch, sound).
9V motors can be attached to NXT motor ports with the same adapter cables,
but of course you don't get the rotation sensor functionality.
Jürgen
--
Jürgen Stuber <juergen@jstuber.net>
http://www.jstuber.net/
gnupg key fingerprint = 2767 CA3C 5680 58BA 9A91 23D9 BED6 9A7A AF9E 68B4
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Message has 1 Reply:
 | | Re: ReMix of LEGO NXT Starter Robot
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| (...) Ah, thanks for the correction. I've only studied portions of the hardware docs so far, mostly regarding the sensor ports. I realized after I posted that I hadn't completely checked my facts. (I hate when that happens!) So does this mean that (...) (17 years ago, 15-Jan-07, to lugnet.robotics.nxt)
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Message is in Reply To:
| | Re: ReMix of LEGO NXT Starter Robot
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| (...) I am curious if you have tried measuring distance travelled simply by reading back the NXT motor encoder values? You would need to calibrate your 'bot so that you know the ratio of encoder units to centimeters or inches travelled (which would (...) (17 years ago, 15-Jan-07, to lugnet.robotics.nxt, FTX)
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