Subject:
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Re: I^2C bus with LEGO Mindstorms
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Sat, 15 Jun 2002 11:59:25 GMT
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Viewed:
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5540 times
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> > Hi Jan,
> >
> > I tested it and it's veeeeery sloooooooooww.
> >
> > Elektuur writes that the interface could be an extention of the RCX for • more
> > sensors you may use for your roboter. The software is written for NQC and
> > uses some sensor functions to realize the i2c protocol. Perhaps it's
> > possible to get the protocol routines faster in assembler code or in
> > optimized NQC.
>
> Might be something to ask Dave Baum
> Or someone could try implementing it in a custom firmware, that might speed
> things up.
>
> > It's a very educational project that shows the details of the i2c
> protocol.
>
> How slow is "sloooooooooww" ? ( :D ) Do I need to think in seconds delay? Is
> it good enough for realtime controlling?
You can get one or two signals per second. I tested it with the knight rider
test tool from the same Elektuur project and with the 4 digit led display.
This is a very old project from Elektuur ... the serial number is 920004-11
... I think ist from 1992 ... I remembered that I assembled and programmed
it when it came out.
>
> BTW there's a compass in the latest Elektuur, also for the RCX... gonna run
> out and get it to check it out. Might be useful, specially since the only
> commercial version I've seen so far is WAY too expensive (over $100)
yes I read it too ... and it's too expensive. For a compass have a look at
http://www.restena.lu/convict/Jeunes/LEGO_Compass.htm
http://www.restena.lu/convict/Jeunes/Pic_Compass.htm
http://www.convict.lu/Jeunes/CompassSensor2.htm
But I don't know if these sensors are cheaper ...
Ralf
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