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 22:09:49 GMT
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Viewed:
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1422 times
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"Nitin Patil" <gn1721@lycos.com> wrote in message
news:GAKC9v.F5A@lugnet.com...
> Also what I did not like in your desigh is 4.7K resistor. which changes
> reading in measure cycle.
With the 0.1uF in parallel with the 4.7K, the voltage on the clock circuit
is still above the measurement voltage during the normal read interval. It
doesn't effect the reading because the diodes are reverse biased. The 4.7K
only comes into play when the power is cut by switching to passive. Then
the capacitor is discharged by it down to where it would effect the reading,
but your not reading it then.
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Message has 1 Reply:
 | | Re: light sensor multiplexer
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| In lugnet.robotics.rcx, Michael Gasperi writes: Ok I agree what you say about time constant of your RC But still by using such low resistance you are wasting power. almost 1.5 mA is flowing through this 4.7K. you can keep RC constant and increase R (...) (23 years ago, 22-Mar-01, to lugnet.robotics.rcx)
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Message is in Reply To:
| | Re: light sensor multiplexer
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| (...) Regarding the power used I think you are correct since it is or the order of few microamp. but even then your design can not ( rather Do not ) switch power. Also what I did not like in your desigh is 4.7K resistor. which changes reading in (...) (23 years ago, 21-Mar-01, to lugnet.robotics.rcx)
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