My setup is basically an arduino uno hooked up to a spectrometer and an LED driver (two separate entities). The spectrometer is sending TTL pulses continuously (once every x seconds) and what I want is that the arduino uno take in these TTL pulses but only send a specific one through to the LED driver. Is there a way to do this - if so, how? Basically I just want one of the TTL pulses to go through to trigger an LED but have the rest not be sent through - is there a way to make the arduino uno accept this single TTL pulse? Thanks!