Update passthru.ino

broke out update thru pin to seperate function

added 10 ms delay to deal with switch bounce, remove later

note that strings terminate with \0 - had to add a case statement to treat it as a '0'

added code to swap pins (valve 0 on/off at the same time as other valve off/on)

used memset to set all the memory in the the triggerSequence buffer to '0'