A Geiger counter triggered decoration.

An Arduino monitors a Geiger counter for pulses (when the red LED flashes). When it detects a pulse, the Arduino then fades 3 strings of LED stars in and out in sequence.

No further triggering happens until the fading has finished, thereby ensuring a relatively sedate speed.

npugh.co.uk/blog/star_jar/
instructables.com/id/Star-Jar-Geiger-counter-triggered-LED-decoration-/

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