Chapter 28. Experiment 28: The Ching Thing

In this experiment, you can build a device to display a pair of hexagrams in an electronic version of the I Ching. I’m calling it the “Ching Thing.”

If these terms mean nothing to you, there is no cause for concern, as I will be explaining them almost immediately.

A much shorter version of this project appeared in Make magazine. Really it was too complicated to be compressed into just a few pages, so I’m presenting a new version of it here, with more illustrations and detailed explanations.

Also, I simplified the circuit with help from my friend Fredrik Jansson, who once built his own computer entirely from 4000-series logic chips. In fact, my first contact with Fredrik was when he sent an email to ...

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