I need a recommendation on what type of trigger/sensor I need to replace the current trigger which is simply a mic. The impetus for the trigger is a fireplace bellow that forces air down 1/2" Tygon tubing which is connected to to the mic which is integrated in to a circuit board which in turn triggers several different relays. Anyhow, the mic does not work essentially because any sound turns the switches on and off. I need an air flow switch that would only work when air is blown into the tube directly. I considered piezo switch, but think that the induction from all the surrounding sound would also trigger the piezo switch.
Any advice is much appreciated.
Thanks in advance,