Multiple switch events are sent by sip&puff interface users

[Jorge Silva]

When hard sips or puffs are sent on a sip&puff interface, the switches pass through their soft equivalents, thus sending multiple switch events to the Tekla shield. An optional filter may be used to eliminate this effect.

[Jorge Silva (jorge-silva)]

It may be better to fix this on the Arduino board since the transition between soft and hard switch events should be shorter than the maximum typical reaction time for user interfaces (~200ms). Will try setting a ~100ms digital filter to see if that solves the problem without causing a noticeable delay.

[Jorge Silva (jorge-silva)]

A counter filter set at 75ms seemed to be the best solution. A potential disadvantage may be that ALL switch events are delayed by that amount (~75ms). But it does not seem to have any significant impact right now.

As pointed out by Eric, it may be best to transfer this filter to each app, since it is easier to update the app than to update the hardware's firmware.

[Jorge Silva (jorge-silva)]

On a second thought, this should actually be solved on the phone's app. Eric's point is very valid and important, so I will keep the bug open considering the fix is only temporal until we can transfer the filter to the switch event provider on the phone.

[Jorge Silva (jorge-silva)]

Starting on 0.4-alpha, the Tekla app introduces switch de-bouncing. Thus, this bug will be closed in order to relay any further issues to that feature. If the problem persists, the best solution may be to add an "Advanced" preference that allows users to control the length of the de-bouncing filter.