Subject:
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Re: External power supply ?
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 13 Jan 2004 15:29:12 GMT
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Viewed:
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1812 times
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> > Maximum RCX power consumption is 1500 mA (there is a fuse inside rated 1.5A).
> > Anything rated at least 1A should be OK.
>
> I ran by Radio Shak today and they had one 3-12v rated at 1A I think. It was
> $37!
I think you could find something cheaper than that (with a fixed-voltage
output?)
>
> I have considered that too. But uncovered another potential complication. In
> researching around somewhere... I think at lego.com actually it said that RCX
> 1.0 does not support variables?! Is that possible? My program is not
> complicated but does use a variable. I might be able to restructure, but it
> hurts my head.
The RIS 1.0 didn't support variables, but 1.0 bricks can use latest firmware so
there is NO problem here !
>
> Another consideration: Please forgive me for not knowing squat about
> electronics... or is that "I *know* squat?"
> I was reading up on LEDs and so forth and saw something using a transistor.
> Wouldn't it be feasible to run power say from a train controller through a
> transistor, and use the RCX to turn that flow on/off? The train controller
> provides the juice for motors, lights whatver (or rather it's wall awart does)
> and the RCX just intervenes. Seems like that would draw a lot less power from
> the RCX. I figured this was possible and maybe not hard but did not know what
> the component was called that would be used.
As Chris mentionned elswhere in this thread, a train controller is NOT a good
idea to power a RCX since it's just too easy to reverse polarity!
>
> Also, maybe someone can chime in, but as to holding the program, I seem to
> recall seeing one of the solutions that involved external power invloved
> connecting a power jack. The guy said he could just quickly swap the wall wart
> and a 9-volt bat(with a plug attached)... he cautioned to have the rcx power off
> at the time and said that it woudl allow him to transport. Not sure who that
> was and can't find the post or web page again!
Yes, that's a simple method to solve the backup problem. There is a capacitor
inside the RCX that provide enough current to keep memory alive during battery
changes. You have a few seconds to do the swap. Just make sure that the RCX is
powered off or the increased current drain would mean instantaneous erasing!
>
> Where's the RCX 3.0 when you need it? You know the one with the battery backup
> and AC jack, about half the size with 6 outputs and 12 inputs and ... sorry, I
> am a bit delerious right now.
Ah? I thought it derived its power from the built in solar panel ;o)
Philo
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Message has 1 Reply:
 | | Re: External power supply ?
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| (...) Right. But that's not what I was asking or suggesting. The idea was...elave the RCX2.0 as is on batteries. Run some other devices off of whatever power source, but control that power source via program logic from the RCX. The RCX could run (...) (20 years ago, 20-Jan-04, to lugnet.robotics)
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Message is in Reply To:
| | Re: External power supply ?
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| (...) I ran by Radio Shak today and they had one 3-12v rated at 1A I think. It was $37! (...) I have considered that too. But uncovered another potential complication. In researching around somewhere... I think at lego.com actually it said that RCX (...) (20 years ago, 13-Jan-04, to lugnet.robotics)
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