Basically, I got hit by a car while biking to school - and found myself working late into the night a lot. So in order to gain some experience with board layout and simultaneously solve my problem of visibility at night... CHIRP LED bar plugs were created! I used a clear 3D printed material for the end caps, CREE Red LEDs and an LT1618 + LTC6992 to drive it. I could probably have used a 555 just as easily - and it would likely be cheaper. But this is what I came up with.