Arduino vs 555 reliability

22 Apr 2012

...

What's a "doorbell controller"?  A momnetary-actionm push-to-make
(form A) single pole switch? I haev a
 couple of new ones hwere with Heath/Zentih logos on the packaging...  
 Ah, but if you have two inputs, two outputs, and a third output that
 should respond to either input, then you may need a pair of diodes, or a
 MICROCONTROLLER :-?

Or double pole pushbuttons. Or relays, operated by the pushbuttons with 2 
cotnact sets on each. Or a current sensing relay in series with the feed 
to the buttons (wired to bells as normal) so that it operates whenever 
eitherof those buttons is closed (and thus the associated bell is 
activated), the contacts of that relay provide the 3rd output.

-tony

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Arduino vs 555 reliability