Step 2Wire the pack for Arduino control
I built a simple Arduino shield that lives in the wand (see pictures). All of the LEDs had a common negative ground, and each positive lead went to either to a digital pin (if it was going to flash) or to the +5v pin if it was going to be on at all times.
I also built an on/off switch into the wand and installed a 9v battery clip to power the Arduino.
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