The optical part of the device consists of two IR LEDs and two Sharp IS471FE optical ICs (OPICs). The optical ICs have built in LED modulators and synchronous detectors, so they won't see light from each other's LEDs. The outputs from the OPICs are connected to an 8 pin PIC microcontroller that handles interpreting input signals and driving the relay and a visible LED that indicates the operating mode. Though there are 11 operating modes, the controller has a very simple user-interface consisting of a pushbutton switch and an LED.
On power up if the beams are properly aligned and unbroken, the LED lights continuously for 1 second then goes dark to indicate the unit is ready to operate in the continuous mode. In that mode the relay will close and remain closed and the LED will light up as long as both IR beams are interrupted. The unit is now ready to connect to your camera.
With some targets you may want to take more than one picture when the target breaks the IR beams. I have included a basic intervalometer function in the controller to allow cameras that don't have a built-in rapid-fire mode to take multiple pictures as long as the IR beams are interrupted. Pushing the mode select button once takes the controller out of continuous mode and puts it in pulse mode. The LED will flash one time to indicate that the relay will close 1 time per second. Some cameras are faster so pushing the button again will move up to 2 pulses per second. By repeatedly pushing the button, the speed will increase from 1 pps all the way to 10 pps, each time flashing the LED to indicate the pulse frequency. Holding the button down for 2.3 seconds resets the unit and takes you back to continuous mode.