[WIP] LED Matrix Board

The purpose of this board is to replace the center brake light on the canopy, with an addressable, matrix style design of some sort (perhaps a longhorn).

Questions to ask:

What is the size constraint?

• 170mm x 85mm

How many LEDs are wanted/needed?

• Assuming worst case, we can operate at 81 LEDs.

  • However, we want a rectangular matrix to replicate a regular brake light.

    • 15x5 provides a rectangular matrix with a center most LED.

    • 75 LEDs total.

What type of LEDs will be used?

• For this specific board we will be using the WS2812B LED.

• WS2812B LEDs are RGB that operate at about 60mA/pixel at 5v, worst case for full white brightness.

What is the current draw?

• 20mA/color channel

• MAX # of LEDS

  • Worst Case: Full white (RBG all at max brightness)

    • 20mA * 3 channels = 60mA/LED

    • 81 LEDs * 60mA = 4.86A

• Our actual use:

  • Worst Case: Full white (RBG all at max brightness)

    20mA * 3 channels = 60mA/LED

    75 LEDs * 60mA = 4.5A