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How measurement intensity light?


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moon14

Wed Jul 09 2008, 01:50AM

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Please!
I have one question

How measurement intensity light?

I have LM339 , Cds cell and several resistors

I need converter intensity light Analog to Digital

regards

Ajay

Thu Jul 10 2008, 08:16AM

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check its datasheet.. you will get info on how to calibrate it.

Second.. use any high resolution analog to digital converter to change the analog o/p of sensor to digital o/p and later calibrate it.

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moon14

moon14

Sat Jul 12 2008, 05:03AM

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Thank you very much

I get on ADC0804LCN

what are ports from 11 to 18, they are Digital?(take 1,0)

thank again

pdi33

Sat Jul 12 2008, 12:00PM

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hi moon,
yes, the pins 11 to 18 of ADC0804 are indeed digital and are the parallel data lines of the ADC interface to the uC.Before u go any further with ur project, I would strongly suggest u go through the tutorial about ADC interfacing with uC on this site having link as below
http://www.8051projects.net/adc-interfacing/adc0804-interfacing.php
also refer to the ADC datasheet and i think a lot of ur doubts would be cleared.
Good luck.

* inspired to develop,developing to inspire *

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moon14

moon14

Sat Jul 12 2008, 12:38PM

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Dear pdi33,

Thanks for more information

I have question

I sorry for many question

What are Pin (1,2,3,5)?

i need more information, please!

Arun Kumar V

Sat Jul 12 2008, 07:21PM

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hi moon

i think pdi33 has already answered your queries here:

also refer to the ADC datasheet and i think a lot of ur doubts would be cleared.

Arun

moon14

Sat Jul 12 2008, 10:30PM

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I sorry , i read Datasheet

but not clear for my

thanks for help me

Ajay

Mon Jul 14 2008, 08:49AM

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Pin 1 is chip select, when you make this pin low ADC becomes active.

Pin 2 is for read signal, making this pin low you can read the data latched on data pins of ADC.

Pin 3 is for write signal also called start of conversion signal. when we make this pin low, ADC starts conversion.

Pin 5 is INTR (interrupt) signal or end of conversion. its an o/p signal from ADC, when this pin is low it means conversion is over and we can read the data.

Please check datasheet for more details.

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