Component video to HD15 isn't exactly an electonics project, you just connect the right wires. A remote wii sensor bar is nothing more than a battery in line with two IR emitters on either end of the bar, hopefully with a limiting resistor or two.. Reliable sensing of a remote IR signal is a totally different matter. Over any distance ambient light is going to be a problem, most IR emitters/sensors that work like this send modulated IR light (like a TV remote) so the detector knows when a real signal is present not junk.