I want to create a laser beam sensor that will act as a zone in a
standard alarm system. I need someone to help me design a circuit.

The laser beam transmitter has to continuously transmit an 8-bit pulse
every X number of seconds (0.01, 0.05, 0.1, 0.5, 1). The beam has to
be visible at all times (constant beam, pulse contained within it).

The receiver will check received pulse; if pulse is not valid then a
relay must be Opened or Closed (as defined by a jumper).

The 8-bit pulse must be settable by 8x jumpers; pulse delay must also
be settable. There must be a jumper to switch pulse functionality
on/off (if Off then a constant beam will be expected by the receiver).
The receiver must also have a jumper to allow 1 invalid pulse when On.

Both circuits must be completely independent - separate power sources.
All components should be obtainable from a hardware/electronics store.