event checkers pseudocode 

CheckStartButton(void)
	check state of button pin
	compare to previous state
	debounce (check time of first change)
		post event if change in state indicates a button press


CheckGameTime(void)
	get time from SM1 module
	check whether current time is past game time interval
	if yes, post event to all SMs
	update servo position

checkAnyBottom(void)
	check state of bottom pin
	compare to previous state
	post event to all SMs if change in state (to low)

CheckInitState(void)
	if SM1 has finished reseting
	and SM2 has finished reseting
	and SM3 has finished reseting 
	(all in ResetGame state)
		post event ResetComplete to all SMs //then SMs move to init state - prevents game from restarting before all SMs have finished resetting

CheckShot(void)
	check state of shot pin
	if high and different from last
		post event to corresponding state machine

CheckTop(void)
	check state of top pin
	if low and different from last
		post event to corresponding state machine

CheckThreshold(void)
	check state of middle tape sensor pin
	if high and different from last
		post event to corresponding state machine

CheckWave(void) 
	check state of wave tape sensor pin
	if high and different from last
		post event to corresponding state machine