get color recognition on LPT

[scorpionss22]

HI all

i want to know how the color present at the output of parallel port
when i press print key from ( paint software)

because i want to build interface card on LPT to recognize the different data
i mean to know when the data is red and when its blue .....ext

thanks for your cooperation

 

[yogi]

You can do it by using an LED and LDR arrangement, but it won't be that much accurate. Use one ADC at the output of LDR to identify the colors. Source code and tutorials for interfacing ADC with parallel port is available on the book
MY EXPERIENCE IN PRALLEL PORT INTERFACING
you can get it from yahoo group-booksbybibin
https://groups.yahoo.com/group/booksbybibin/