JimG:
With nothing powered on, use your multimeter to check continuity on each speaker unit
Hi Jim
I think you are right. With nothing powered on there was continuity between vdd and speaker +. There was not continuity between - speaker and GND.
As for what I'm trying to accomplish - I am trying to use wireless doorbells as wireless buttons (i.e. digital inputs).
I'm now wondering how I should wire these up to the Arduino. I had intended to connect the speaker + contacts to digital input pins and tie all of the speaker- to ground - but this is obviously is a no go.
How would you guys do this?
THANKS