Back in the late 1970s, I was blending my consulting business with a budding career as a freelance writer. One of my rules for myself was that every project had to yield at least one published article, and this one fell out of a machine that I built for Robinson-Nugent, a manufacturer of IC sockets…

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This collection of optical sensing techniques fell out of some consulting I was doing in the mid-1970s, using embedded microprocessor boards to do machine control in industrial environments. I was particularly fond of this article, since their art department took my sheaf of hand-drawn sketches and turned them into a thing of beauty. I ended…

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