As it turns out, our friend Danielle had written about something similar two years ago. http://www.daniellemorrill.com/2010/06/how-i-built-a-multi-user-door-buz

As it turns out, our friend Danielle had written about something similar two years ago. http://www.daniellemorrill.com/2010/06/how-i-built-a-multi-user-door-buzzer-for-our-apartment/ http://www.daniellemorrill.com/2010/06/how-i-built-a-multi-u... Great minds :D