Subject:
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Re: LEGO Electro-magnet
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 20 Apr 2001 07:51:14 GMT
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Viewed:
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1684 times
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Hello Rainer,
True! But simplicity sometimes takes a long time to be acheived ;)
But there may be some use in flyback and series diodes: Andreas says that
his magnet consumes 9mA, below what is available through sensor ports in
active mode. So a magnet could be also commanded through these ports,
switching from active(light) sensor type and passive(touch) sensor type.
These ports are probably not so much protected for inductive loads.
A last question for the use of input ports: will the remaining magnetization
caused by the 10k pullup in passive mode be low enough to release payload ?
Philo
http://www.philohome.com
> Hi Philippe,
>
> you're right, but you don't need this flyback diode, as Philip Taylor mentioned
> here : http://news.lugnet.com/robotics/?n=15158
> Because you don't need a flyback diode, you also don't a diode in series.
>
> Rainer
>
> P.S.: I had the same ideas than you mentioned above ;-)
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Message has 1 Reply:
 | | Re: LEGO Electro-magnet
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| Hi Philippe, (...) Hmm, I guess they are NOT protected. (...) Not sure, (I'm not an electrical-engineer please Andreas Peter, help :) ) But, when the coil has a consumption of 9mA at 9V it's 1k. (81mW) So if I undestand it right, you're in parallel (...) (24 years ago, 20-Apr-01, to lugnet.robotics)
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Message is in Reply To:
| | Re: LEGO Electro-magnet
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| (...) Hi Philippe, you're right, but you don't need this flyback diode, as Philip Taylor mentioned here : (URL) you don't need a flyback diode, you also don't a diode in series. Rainer P.S.: I had the same ideas than you mentioned above ;-) (24 years ago, 19-Apr-01, to lugnet.robotics)
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