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after designing switch circuit, using 4 relays, 4 leds, 4 resistors and an integrated circuit(ULN2803), d circuit worked perfectly well,but  i am having problems interfacing the circuit with d PC via the parallel port. d program written in code keeps generating errors. i'll like if u can assist me with d interfacing.

  

hello...howru???
i liked ur project ...can u plz send me complete details about ur project.waiting fro ur reply ......my email  is  chill_dude86@yahoo.com

  

please send me brief description about your project thanks

sakura_adu@yahoo.com.ph