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 14:58:29 GMT
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Viewed:
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1324 times
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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.
I see, but as mentioned above, i don't need random access.
Your circuit of course have advantages ! No question !
Very low power consumption, ready to use (no need to build it), small
design, ...
But it doesn't make sense in the job i'm doing with the sharps.
You did a graet job, but I can't use it. :(
Best wishes
Rainer
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Message has 1 Reply:
 | | Re: light sensor multiplexer
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| In lugnet.robotics.rcx, Rainer Balzerowski writes: hi Rainer (...) 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 (...) (23 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, 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. (...) (23 years ago, 21-Mar-01, to lugnet.robotics.rcx)
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