void el_calibrate_sensors()
calibrate the proximity sensors and setup a random seed
void el_initialization()
initialize the library
void el_main_loop()
the "engine" that drives the software components in this library
void el_sleep(el_time time_ms)
delay a period of time given in millisecond
void el_reset()
reset the microcontroller
void el_break_main_loop()
signal el_main_loop to stop