http://www.8051projects.net/ Learn to make simple microcontroller projects, pic, 8051, avr and arm projects. download 8051 projects, tutorials, libraries, sample codes. join the microcontroller discussion forum and ask doubts regarding electronics. the best source for 8051 over internet. en-gb 2009-01-07T19:04:20-08:00 contact@nospam.com hourly 1 2000-01-01T12:00+00:00 http://www.8051projects.net/forum-t10715.html 2009-01-07T19:04:20-08:00 Please!I have one questionHow measurement intensity light?I have LM339 , Cds cell and several resistorsI need converter intensity light Analog to Digitalregards http://www.8051projects.net/forum-t10715.html 2009-01-07T19:04:20-08:00 Ajay 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. http://www.8051projects.net/forum-t10715.html 2009-01-07T19:04:20-08:00 moon14 Thank you very muchI get on ADC0804LCN what are ports from 11 to 18, they are Digital?(take 1,0)thank again http://www.8051projects.net/forum-t10715.html 2009-01-07T19:04:20-08:00 pdi33 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 belowhttp://www.8051projects.net/adc-interfacing/adc0804-interfacing.phpalso refer to the ADC datasheet and i think a lot of ur doubts would be cleared. Good luck. http://www.8051projects.net/forum-t10715.html 2009-01-07T19:04:20-08:00 moon14 Dear pdi33,Thanks for more informationI have question I sorry for many questionWhat are Pin (1,2,3,5)?i need more information, please! http://www.8051projects.net/forum-t10715.html 2009-01-07T19:04:20-08:00 moon14 I sorry , i read Datasheetbut not clear for my thanks for help me http://www.8051projects.net/forum-t10715.html 2009-01-07T19:04:20-08:00 Arun Kumar V hi mooni 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 http://www.8051projects.net/forum-t10715.html 2009-01-07T19:04:20-08:00 Ajay 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.