Here’s a practically guaranteed way to get yourself over the hump and learn Morse, from Australian Ben Buxton. The USB key interface is built into a mint tin and provides a dual input port for a standard USB keyboard to access non-Morse characters. A numeric display on the tin reports your coding speed, and tapping out “SOS” without letterspaces brings up the settings menu in software.

Got to agree with tipster Alan Dove, who quipped that any project successfully mixing Arduino, mint tins, USB interfaces, and International Morse Code results in “unassailable geek cred.” [Thanks, Alan!]