Star Jar Geiger counter triggered LED decoration using Arduino

This instructable builds on top of the Geiger counter triggered LED decorations I made last year. This version powers the Geiger counter from the Arduino (itself now powered from a mains adaptor, so I no longer need to keep feeding them batteries) and the LEDs now fade in and out for a more gentle effect. What you'll need: A Geiger counter with pulse output (I'm using the Gieger counter from MightyOhm) A fe ...

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