The PIC program is very simple and is based on a main loop that flashes the two leds using a random generated seed.
When the PIC wakes up (for a switch of the reed bulb when the user move near to the bulb a magnet) the microcontroller counts the time for what the user activate the switch. This time is used for random number generation and in order to change the two led relative phase. During this period one of two leds is switched on (at 50% brightness) and remains in this state until the user activate the reed bulb.
After this initialization the two leds flashes asynchronously with a 1s period. The end of flashing can occur for two reasons: a) Timeout if the circuit flashes for 1 hour or if the user re-activate the reed bulb for at least 1 second.
The shut down procedure switch on (at 50% brightness) one led and go in sleep mode when the user deactivate the reed bulb (moving the magnet away) shutting off the two leds and the CPU.
All the parameters are specified in constant section for user tuning and easy modifying.