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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Wed, 21 Mar 2001 19:29:43 GMT
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Viewed:
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1346 times
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In lugnet.robotics.rcx, Rainer Balzerowski writes:
hi Rainer
> Now adress second sharp -> 10ms LOW 10ms HIGH 10ms LOW -> 30 ms + 53ms for
> reading second sharp. 50ms + 53 ms for third. Together 249ms.
> Do I make a mistake ?
This is not true since you need to maximum of 60ms after that time out
occurs in microconterolor and it chanes the sensor.
yes that is true that it is slow for your application.
I maid it from removing limitation on sensors. where you have sensors which
you need to check conditionaly ( not intended for fast switching)
like if you have experimet say you need to get distance Vs ambient light
plot then this can be very usefull.
I am not saying that you have to use it!:-)
Just trying to showother what I have made. since no one has made something
like this ( not known to me at list)
any way bye and regards.
Nitin
> Hi Nitin,
>
> In lugnet.robotics.rcx, Nitin Patil writes:
> > 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.
>
> Yes, sadly but true. That's why I have to use a battery anyway. (Or an
> output, but I would save it for other tasks.)
>
> > Regarding timing you need one pulse to three pulses to chose and transfer
> > the sensor. once you have done it you can be there on that sensor as long as
> > you wish. ( it looks like to me that you have( or I have ) little
> > misunderstanding on what I(or you ) do.
>
> I understand. I should have explained what i'm doing with the sharps, sorry.
> I have a task running, that continuously read the values of the three sharps
> (in a cycle) and store them in global variables. This way I have valid
> values from my sharps all the time (some 10ms old).
>
> This timing is for (theoreticaly) use with Sharp GP2D12 only !!
> With your solution I have to adress first sharp with 10 ms LOW (as described
> on your website), then have to wait (worst case of course) 53 ms for first
> valid data from the first sharp.
> Now adress second sharp -> 10ms LOW 10ms HIGH 10ms LOW -> 30 ms + 53ms for
> reading second sharp. 50ms + 53 ms for third. Together 249ms.
> Do I make a mistake ?
>
> > Regarding Gasperis circuit. first of all it is NOT random selection of
> > sensors. and you need a referance channel. another in not very effecient in
> > power since it have lot of components. I have single microcontrolor running
> > at 4Mhz and if the power requirements are stringents I can run it at lower
> > speed to get it working at extremely low power.
>
> > Now adress second sharp -> 10ms LOW 10ms HIGH 10ms LOW -> 30 ms + 53ms for
> reading second sharp. 50ms + 53 ms for third. Together 249ms.
> Do I make a mistake ?
>
> Best wishes
>
> Rainer
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Message is in Reply To:
 | | Re: light sensor multiplexer
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| Hi Nitin, (...) Yes, sadly but true. That's why I have to use a battery anyway. (Or an output, but I would save it for other tasks.) (...) I understand. I should have explained what i'm doing with the sharps, sorry. I have a task running, that (...) (23 years ago, 21-Mar-01, to lugnet.robotics.rcx)
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