 | | light sensor multiplexer —Nitin Patil
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| | | just now I have finished making of light ( any powered) sensor multiplexer. this sensor does not need any external battery. can multiplex 3 sensor . gives random access to any sensor you can select any sensor by giving ( momenterely changing to (...) (23 years ago, 19-Mar-01, to lugnet.robotics.rcx)
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| | | | | Re: light sensor multiplexer —Rainer Balzerowski
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| | | | (...) Hi Nitin, if you do NOT need an external battery, how much current (with which voltage) does your multiplexer provide for each active input ? Very interested, Rainer (23 years ago, 19-Mar-01, to lugnet.robotics.rcx)
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| | | | | | Re: light sensor multiplexer —Nitin Patil
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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 (...) (23 years ago, 20-Mar-01, to lugnet.robotics.rcx)
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| | | | | | Re: light sensor multiplexer —Rainer Balzerowski
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| | | | (...) 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 (...) (23 years ago, 20-Mar-01, to lugnet.robotics.rcx)
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| | | | | | Re: light sensor multiplexer —Nitin Patil
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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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| | | | | | Re: light sensor multiplexer —Rainer Balzerowski
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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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| | | | | | | Re: light sensor multiplexer —Nitin Patil
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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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| | | | | | Re: light sensor multiplexer —Michael Gasperi
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| | | | (...) I'll bet you can't even measure the power used in the two CMOS parts. Why don't you publish your design so we can pick on it? Michael Gasperi (23 years ago, 21-Mar-01, to lugnet.robotics.rcx)
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| | | | | | Re: light sensor multiplexer —Nitin Patil
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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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| | | | | | Re: light sensor multiplexer —Michael Gasperi
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| | | | "Nitin Patil" <gn1721@lycos.com> wrote in message news:GAKC9v.F5A@lugnet.com... (...) 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 (...) (23 years ago, 21-Mar-01, to lugnet.robotics.rcx)
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| | | | | | Re: light sensor multiplexer —Nitin Patil
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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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| | | | | | Re: light sensor multiplexer —Michael Gasperi
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| | | | | "Nitin Patil" <gn1721@lycos.com> wrote in message news:GALoKA.Eto@lugnet.com... (...) mA (...) If you use my simple approach, you need 4.7k and around 0.1uF. You need a low enough resistance to guarantee that the voltage drops to CMOS logic level 0 (...) (23 years ago, 22-Mar-01, to lugnet.robotics.rcx)
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| | | | | | Re: light sensor multiplexer —Stef Mientki
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| | | | hi Nitin, I'm an energy freak to, but I can't follow your reasoning Because I'm building a multiplexer too (probably will be posted next week, so I can make still some changes) and I'm using even lower resistor values then Michael (due to a (...) (23 years ago, 22-Mar-01, to lugnet.robotics.rcx)
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| | | | | | Re: light sensor multiplexer —Nitin Patil
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| | | | Hi Stef, sorry for little late. What I am doing is that I need to get the voltahge down and most efficient way of doing that without losing swing ( if you divide you lose swing too) is level shift it and you can do it by putting by Zener. I need (...) (23 years ago, 27-Mar-01, to lugnet.robotics.rcx)
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| | | | | | Re: light sensor multiplexer —Stef Mientki
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| | | | Hi Nitin, thanks for your information. You know, by asking questions, you'll get the answers often from yourself. Just when I posted the question to you, Eureka. But let's be fair, you were the one who triggered me. I've adapted (without the power (...) (23 years ago, 27-Mar-01, to lugnet.robotics.rcx)
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| | | | | | Re: light sensor multiplexer —Nitin Patil
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| | | | Hello to every one.... all the time I was promising to put up ckt Digram for time being I have included hand drawn Ckt visit (URL) I am using are low thereshold FETs (...) (23 years ago, 30-Mar-01, to lugnet.robotics.rcx)
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| | | | | | Re: light sensor multiplexer —Stef Mientki
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| | | | hi Nitil, that's a nice and simple cirquit, but isn't there anything wrong with the grouding ? (...) -- met vriendelijke groet, Stef Mientki email: s.mientki@ids.kun.nl tel: 024 361 3905 fax: 024 354 1211 Postadres: KUN / fmw 171 Instrumentele (...) (23 years ago, 31-Mar-01, to lugnet.robotics.rcx)
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