I purchased two Arduino Uno compatible boards, which are on the pink sheet. In the center is an Arduino Leonard with a small interface board plugged on top. Currently it is used as a K3NG CW keyer. The keying output of the keyer is connected to my Vibroplex in parallel so that I can use either a paddle (not shown in ghe figure) or a bug.
I think I am going to make another K3NG keyer with newly obtained boards, which will hopefully be somewhat better looking than my first work.