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 Robotics / 15503
15502  |  15504
Subject: 
RE: Custom Firmware, IR Problems, and Dead RCXs (long)
Newsgroups: 
lugnet.robotics
Date: 
Sun, 27 May 2001 18:07:33 GMT
Viewed: 
664 times
  
Andy Gombos wrote:

Oh, geez, this could be bad.  Could changing the firmware to reduce comm
activity fix this?  It seems to be a problem of usage, not specific
firmware properties (i.e. constant data uplaoding.)

Well, yes and no. The biggest risk is when you use the tower or
the RCX in high-power (far) mode for extended transmissions.

I was thinking about why we have not received more posts about
dead RCXs. My old pbForths (and I think legOS too) set the default
range to low. In fact, the ability to set a high-power range was on
the wish list for the next release of pbForth.

In the process of testing my new serial routines, I managed to burn
out one tower and the RCX twice. Now, the nice folks at LEGO replaced
the tower for me, but that was before I figured out the RCX was dead
too! I'm too embarassed to ask for a replacement unit....besides, it's
easy enough for me to fix.

I'm putting a 50 Ohm resisitor in series between the IREDs on the
RCX main board to avoid future problems like this.

Any other opinions on this issue?

Cheers, Ralph Hempel

--------------------------------------------------------------------
Check out pbFORTH for LEGO Mindstorms at:
<http://www.hempeldesigngroup.com/lego/pbForth>

Buy "Extreme Mindstorms: an Advanced Guide to Lego Mindstorms"
<http://www.amazon.com/exec/obidos/ASIN/1893115844/hempeldesigngrou>
--------------------------------------------------------------------



Message has 1 Reply:
  RE: Custom Firmware, IR Problems, and Dead RCXs (long)
 
Hi all, Just a couple a quick comments on this thread - I'm a firmware design engineer who's done lots of work with IrDA. I don't, however, have any experience with the internals of the RCX or the IR Tower, other than owning them and reading this (...) (23 years ago, 27-May-01, to lugnet.robotics)

Message is in Reply To:
  Re: Custom Firmware, IR Problems, and Dead RCXs (long)
 
Oh, geez, this could be bad. Could changing the firmware to reduce comm activity fix this? It seems to be a problem of usage, not specific firmware properties (i.e. constant data uplaoding.) Andy (...) -- See my Visual Interface for leJOS at (URL) (23 years ago, 27-May-01, to lugnet.robotics)

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