The YellowHat Device provides 32 input lines for analog or digital input along with a WS2812 LED Chain for up to 530 RGB LED's.
The color of each LED can be controlled by block detector input, switch statuses, signal aspects, layout power status, button activities, or analog values from e.g. a potentiometer.
The YellowHat is primarily designed as module for building CTC panels as demonstrated in IoTT Videos #9 and #31