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40 channels for sensors
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moon14
Tue Nov 04 2008, 10:51PM
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Hello,

I have 40 sensors , I need read all sensor by Parallel port

I used ADC0804 read one sensor
Can use another piece for expansion Parallel port for read all my sensors

please! I need reaply as soon as possible, Please!

Thanks
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Ajay
Wed Nov 05 2008, 12:39PM
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you need ADC with more channels 0804 is not enough it seems
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ExperimenterUK
Wed Nov 05 2008, 06:49PM
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Many microcontrollers have 10 or more ADC channels.
Put four on a board, and use one to collect the data from the others.

Then the "Master" sends the results to the parallel port.

Learning all the time
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moon14
Thu Nov 06 2008, 01:16AM
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I need schema fo circuit
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pdi33
Mon Nov 10 2008, 08:45AM

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u can also try using an analog multiplexer like 4051 which can be switched using the uC though that would entirely depend upon what type of sensor u are interfacing and will sense only one sensor at a time which might create some delay till it scans all the sensors.
.

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ExperimenterUK
Mon Nov 10 2008, 10:15AM
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pdi33 wrote ...

u can also try using an analog multiplexer like 4051 which can be switched using the uC though that would entirely depend upon what type of sensor u are interfacing and will sense only one sensor at a time which might create some delay till it scans all the sensors.

Actually simple multiplexers is probably the best way, perhaps with a single microcontroller
to organize things
There are many types eg, the DG406B is 16 way.


[ Edited Mon Nov 10 2008, 10:19AM ]
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