Subject:
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Re: RCX NXT internals questions
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 12 Jan 2006 21:09:32 GMT
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Viewed:
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1470 times
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In lugnet.robotics, Mark Bellis wrote:
Here's a couple of my thoughts:
> 1. What is the sensor port protocol (electronically speaking - internal circuit
> diagrams with voltage and current levels, timing etc...)?
>
> 2. What is the motor port protocol (as above)?
Snip
> 5. Will there be a proprietary lead to convert 6-wire digital protocol to 2-wire
> analogue protocol in order to allow older RCX sensors (active and passive) to be
> used with the NXT? If not, can the internal circuit of a new sensor be used
> with the sensor port circuit of the RCX 1.0 to create such an interface?
Both "types" of port are 6 wire. Assuming 2 lines for power, what are the other
4? My guess? 2 are for digital sensor comms, and (hopefully) these 4 lines are
the same for both motor & sensor ports. The other 2 are for motor control on the
motor ports, and for ??? on sensor ports. Maybe ??? means NXT will still be able
to use the analogue sensors from RCX with an appropriate converter lead? Note
that same lead MAY also allow you to use the current Technic motors on the the
motor outputs. This is all conjecture (with fingers crossed beind my back).
> Power supply:
>
> 6. Is there a socket for an AC adapter, even if none is included in the set? If
> not, then does the NXT require just 9V DC or 5V DC as well?
It has been said elsewhere that there is no adapter port. But given that it uses
6 AA batteries, one has to assume that all supplies it needs are generated from
a single 9V supply.
> 9. Can a portable battery-powered USB hub be made to service four NXTs without a
> lot of software on board (i.e. it would poll the NXTs and deliver simple
> messages), assuming it could supply four ports at up to 500mA per port?
Hmmm interesting idea, I don't see why not. Of course the implementation is well
beyond my sphere of knowlegde :)
> 10. If there are three NXTs together, can #1 communicate with #2 over Bluetooth
> without #3 listening in?
>
> 11. Can #2 and #3 both simultaneously listen to #1 over Bluetooth if desired?
>
> 12. Can all three have independent data conversations with each other at once,
> or is one NXT limited to communicating with one other NXT, PC or phone at once?
From my limited knowledge of Bluetooth (gained in the last few days!) I would
say, there can only be one "conversation" at once. However like single-taking
CPUs, with an appropriate protocol and good programming, they can "look" like
they are carrying on more than one conversation concurrently.
ROSCO
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Message is in Reply To:
 | | Re: RCX NXT internals questions
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| (...) (SNIP) (...) This is what I'd like to figure out: Sensor and motor expansion: 1. What is the sensor port protocol (electronically speaking - internal circuit diagrams with voltage and current levels, timing etc...)? 2. What is the motor port (...) (18 years ago, 12-Jan-06, to lugnet.robotics)
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