Write a program for the arduino that utilizes interrupts. When no button has been pressed your 16x2 display should say something like "We have been waiting for X seconds", where X will be updated as time goes on.

What is domain name system (dns)? allows dynamic ip address allocation so users do not have to have a preconfigured ip address to use the network converts ip addresses into domains, or identifying labels that use a variety of recognizable naming conventions the efficient coexistence of telephone, video, and data communication within a single network, offering convenience and flexibility not possible with separate infrastructures the integration of communication channels into a single service