after bricking the ar-150 router for the fifth or sixth time, i decided i wanted a project for which success was relatively assured. and since i am learning morse code, connecting my key to my laptop seemed like a good idea.
i found a "travel" mouse at the local thrift store. it was small, had a retractable usb cable, and was cheap. the first photo show it take apart and the two momentary contact switches unsoldered from the board.
three pieces of hookup wire, one to ground and one each to what was the non-grounded side of momentary switches. connect the ground to the sleeve of a 3.5mm stereo plug, and the other two to the ring and tip. mount the stereo plug on the cap of a pill bottle, cut a little notch for usb cable (one advantage of using the travel mouse: the cable is small and flat.), slip the board into the bottle. done.
the second photo shows the the interface connected to my kent tp1 and plugged into a usb port on my mac.