connecting lego sensor to pic

[bloody-orc]

hi there
i have a schematic:
**broken link removed**

i need to control it with a ordinary pic. could someone please explain me how do i do it. im using it to control lego light sensor **broken link removed**

thank you.

 

[Someone Electro]

Isent an light sensor just an photo didoe and an LED conected anti perellel ?

 

[bloody-orc]

nope. i need to make this schematic but cant understand this one. like what is this Procesessor pull up output used for? and also this current source area. what for is this good?