Same as Java - break the problem down, debug and test the items separately.
Interface to (unspecified) infrared sensor.
Interface to (unspecified) camera - this could be tricky, depending on expectations/requirements.
Interface to LED (easy).
Interface to (unspecified) network device.
Combine all of the above, rinse and repeat until finished.
If you're comfortably with Java, you should have few difficulties, though you may have to give up a few luxuries.