Subject:
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Re: RCX infra red sensitivity
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 21 Jul 2006 10:41:21 GMT
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Reply-To:
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danny@orionrobots.co.uk%saynotospam%
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Viewed:
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3176 times
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On 21/07/06, Philippe Hurbain <philohome@free.fr> wrote:
> Hi Danny,
>
> > Beware - this is a serious warning, as the RCX deals with motor
> > output, rechargeables can behave differently current wise from
> > non-rechargeables, and this may increase the likelyhood of burn outs
> > or damaged components when motors are stalled.
>
> Have you seen real failures using some rechargeables batteries? I believe that
> the RCX motor driver IC is really foolproof, and I don't think anything could be
> destroyed using various kind of batteries (provided that the 9 or 10 Volts
> voltage is not exceeded of course...)
I have not seen them on the RCX, but I have on other devices, where
power transisotrs have died. Its all to do (I think) with the
characteristics under load, and the fact that larger spikes in current
may occur with rechargeables. If the IC has a cutout of some sort,
then you are more likely to see it just stop as oppose to destroy
itself though.
Now the other question is that what other side effects are likley from
the under-voltage from rechargeables? If power levels were just low
enough to under power the h8 or its peripheral components - is there
not a potential for instability and resets? Maybe some of this should
be tested on an RCX, although I will admit to being a little reluctant
to try stuff like this on one of my own.
Danny
--
Danny Staple MBCS
OrionRobots
http://orionrobots.co.uk/blogs/dannystaple
(Full contact details available through website)
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Message has 1 Reply:
 | | Re: RCX infra red sensitivity
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| (...) Yes, the driver IC is current-limited to about 500mA (and thermal limited too), so it is very hard to destroy! (...) I have used NiMH batteries a lot on RCX, the only adverse effect I noticed is that the power available on motors is nearly (...) (18 years ago, 21-Jul-06, to lugnet.robotics)
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Message is in Reply To:
| | Re: RCX infra red sensitivity
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| Hi Danny, (...) Have you seen real failures using some rechargeables batteries? I believe that the RCX motor driver IC is really foolproof, and I don't think anything could be destroyed using various kind of batteries (provided that the 9 or 10 (...) (18 years ago, 21-Jul-06, to lugnet.robotics)
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