Tricky Circuit — six complete experiment source sets

These are the exact current article fragments, complete source programs, original
full-size PNG/editable SVG diagrams and blank observation worksheets selected for
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The ESP32 terminal lesson contains a two-file Arduino sketch: keep its .ino and .h
together. Its two supplier photographs identify advertised options; they are not
Tricky Circuit hardware tests, guaranteed bundle contents or verified carrier wiring.
Original photograph attribution and disclosure remain in the unchanged article.

Host-side code checks and original explanatory diagrams do not establish a physical
build, target execution, calibrated measurement, transient margin or safety rating.
Use each exact named board/part and software version, and perform its qualification
procedure before interpreting your own observations. Blank worksheets are not results.

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