-Arduino- preferably wired and battery powered. Size restriction if placed under the lid (4" long). Size restriction if placed inside the core - 5.5" long.
OLED screen, size .96". I would like numbers to be displayed and perhaps a chart/graph. Data on screen to fluctuate with the breathing LED strips.
-LED strips, 2-3 strips. Pulsate/breathe function.
I would use an Arduino Micro or Nano board as they are a lot smaller.Yes their are lots of these about, this one https://www.adafruit.com/product/326 or you can get full colour ones like this oneThe Neopixel strip is AdaFruit's way of describing the WS2812b addressable LED. Their web site has plenty of tutorials about how to use them.To find out how to use this site correctly please read this:-How to use this forumAnd here for finding out how to post photographs because we don't like going off site for pictures.image guide