The NeoPixel LED strip is controlled by input from a vibration sensor (https://www.adafruit.com/product/2384) to read if there is motion in the hand. To keep the LEDs on, there must be consistent “fidgeting” with the sensor. As “fidgeting” slows or stops all together, the lights will dim out and then turn off, until fidgeting picks up again.
The final intent is for the vibration sensor to be embedded in a pen size enclosure to enable simple fidgeting similar to what is done already when holding a pen to keep the LEDs running. Unfortunately, the vibration sensor readings became erratic after soldering therefore further investigation is needed before completing the final handheld product. At the moment, the sensor is read off the breadboard for consistency.