So, first of all let me state for the record I had 3 Grande House Margaritas this evening, one of which was a Coronarita, and I may be a little incoherent at this point.
Down to business: we have a working prototype alpha of the Remote Building Entry Unlocker. It doesn’t do anything fancy. If you push the button at the door, it rings the buzzer, lights up the unit, and then unlocks the door. Woo!
It is a little more complex than one would expect, since the Arduino can’t sense above 5v, and the door panel is 12v. Also the Arduino native ports can’t really trigger a relay coil off anything not the 5v rail (though I suppose I could have just used a pin as ground with a toggle on that, but it’s neither here nor there).
Here’s the build and code.
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