Subject:
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Re: Electromagnetic device
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Newsgroups:
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lugnet.robotics.nxt
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Date:
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Mon, 15 Jan 2007 22:40:46 GMT
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Viewed:
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10859 times
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In lugnet.robotics, Patrick J. Levy wrote:
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Hi,
I was wondering if it is possible to use a electromagnetic device with the RCX
and NXT. I tried with this one from a disk drive, and it worked quite well,
but a few seconds after it start, the RCX shows the “low battery” icon. (The
batteries are OK, and when i checked later, it reports normal 8.0 Mv)
1. May I use some kind of resistor in the wires?
2. Why RCX reports low battery? It seems like motors on heavy load...
3. Is possbile to minimiz/avid this? How this impact in the electromagnetic
performance?
4. If i must use a diferent/best electromagnetic device, what kind or
specification i must look for?
Thanks for any help!
This is the electromagentic device plugged in the RCX:
http://tdi-ng.locaweb.com.br/patrick/lego/internals/eletro.jpg
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Hmm... It sounds like the solenoid is drawing more current than the RCX can
supply. You might want to measure the coil resistance to see what kind of
current it is trying to draw from your RCX.
I do notice from your picture that you have a version 1.0 RCX equipped with an
AC power input jack. Have you tried running the RCX off of a “wall wart” AC
adapter? This can prevent sag in the supply voltage when an application must
deliver a lot of power to the motor outputs.
But beware, because if you are really drawing too much current from a motor
output you could damage the driver circuit inside the RCX. Sometimes it is
necessary to use multiple motor outputs (connected in parallel, and *always*
driven together) to increase the power available. If you do this, make sure you
get the polarity right, and always turn the motors on/off at the same time.
Otherwise, you could do more harm than good.
A good example of an RCX application that handled these issues is
Mark Riley’s LDCC train
control program. Mark’s replacement firmware used an RCX to drive DCC-modified
train motors. He shows how to use a 2x8 electrical plate to connect motor
outputs in parallel, and also suggests using an AC adapter.
Again, triple-check every connection and line of code before you power it up,
since you could easily damage your RCX doing this kind of thing. (You’ve been
warned, so don’t blame me!)
Hope this helps.
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Message is in Reply To:
 | | Electromagnetic device
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| Hi, I was wondering if it is possible to use a electromagnetic device with the RCX and NXT. I tried with this one from a disk drive, and it worked quite well, but a few seconds after it start, the RCX shows the "low battery" icon. (The batteries are (...) (18 years ago, 15-Jan-07, to lugnet.robotics)
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