Subject:
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Re: light sensor multiplexer
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Tue, 20 Mar 2001 22:19:08 GMT
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Viewed:
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1523 times
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In lugnet.robotics.rcx, Nitin Patil writes:
> Hi Rainer
>
> What I do is that switch the power to silected sensor only I do it by using
> FET. since there is not enough power for all sensors.
> so when you switch to sensor 2 other sensors are kept off.
> there is enough power for one sensor since my circuit takes only 500 microAmp.
> which is around 4%of total power.
> I have more details ( see in specification/ some no that can give you idea
> of power) on www.geocities.com/mindsensors
> and I am composing more on circuit to add. once that is done I will put it up
Hi Nitin,
okay, I see.
Sorry, but then your circuit isn't interesting for me.
I thought about using Sharp GP2D12 with it, but that won't work.
First the Sharps have a current consumption of about 33mA up to 50mA max.
Second the Sharps need (see Datasheet) 38,3ms +/- 9,6ms till first
measurement plus 5ms from first measurement to first output. (worst case 52,9ms)
-> 10ms + 30 ms + 50 ms + 3* 53ms = 249ms per cycle. -> 4 cycles per second
when turning of the sharps between measurments :(
That's why I'll prefer the solution of Michael Gasperi.
(I build it, look here : http://www.informatik.fh-hamburg.de/~lego )
Never the less it's a great work you offer.
Rainer
P.S.: I asked a friend of mine to layer and route the Gasperi circuit I
introduced above with surface mounted devices. (maybe with 9 inputs) I'll
post success here (will take some weeks (month ? years ? decades ?
millenniums ?)). So perhaps a little series if someone interested ?!?
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Message has 1 Reply:
 | | Re: light sensor multiplexer
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| Hi Rainer, I do not understand quite your point about timing. Regarding to power sharp takes much more than what your RCX can give ( my measuremants show that RCX gives RMS current of )15 mA only this is not going to drive your sharp at all. (...) (24 years ago, 21-Mar-01, to lugnet.robotics.rcx)
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Message is in Reply To:
| | Re: light sensor multiplexer
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| Hi Rainer What I do is that switch the power to silected sensor only I do it by using FET. since there is not enough power for all sensors. so when you switch to sensor 2 other sensors are kept off. there is enough power for one sensor since my (...) (24 years ago, 20-Mar-01, to lugnet.robotics.rcx)
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