To be sure, using infrared communication for a robot has certainly
proved to be not the best idea of LEGO's (it still beats me why they
ever chose it).
As there has been pointed out a many times now in the lejos-discussion
archives (*ahem*), problems as described may arise from ambient lights
or a not sufficiently positioned RCX.
Whereas a solution as Christian's will undoubtedly do the job, to my
experience dimming brilliant lamps or suns :-) and arranging the RCX in
front and slighty above the tower will answer in most cases.
Regards,
Matthias
Christian Holden wrote:
My experience with leJOS is that it is notoriously difficult to
download the programs. Generally, my Mac would either not get response
from the RCX, or it would fail in a manner similar to what you're
describing.
Last summer, I devised a solution that solves the first problem (no
contact) and greatly reduces the chance of the second. I simply
constructed a cradle (with LEGO bricks, of course) for the RCX that
holds both the IR Tower and the RCX in a fixed position relative to
each other. It generally works on the first (failing that, second)
attempt.
Of course, this means that I have to physically disonnect the RCX from
the rest of the robot when I want to (re)program it...
Christian Holden
Karisvingen 14c
NO-7040 Trondheim
NORWAY
-------------
The impossible will just take a little longer.
http://www.stud.ntnu.no/~christh
On 9. feb. 2006, at 00.15, Zack Kay wrote:
hi all,
im just trying to get lejos set up on my rcx (using a powerBook G4,
OS 10.4.4), and when i try to upload the helloworld.bin file, i get a
response =-4 returned in the terminal. It starts to download..but
then it stops.
any help would be appreciated,
Zack
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