# Tri-Colour LED

This is the second type of LED sometimes called a bi-colour LED. It has two independent LEDs in the one package, but with one common leg tied together, make these a three legged LED. None, one or both LEDs can be illuminated, giving 4 states. The schematic of the LED is shown below.

As shown in the schematic, these LEDs come in two configurations; common cathode, where the cathodes of the LEDs are connected, and common anode, where the anodes are connected together.

These LEDs require two current limiting resistors and two microcontroller pins. A tri-colour LED can be connected to any I/O port. An example a connection is shown below.

## Properties

### Name

Components can be given an optional name. This is seen in the Test tab. Not all applications support the name. Hidcomp/hidconfig supports names.

### UsagePage/Usage

The UsagePage and Usage of the LED. See Usages for more information.

### Type

Whether the anodes or the cathodes of the internal diodes are connected together.

### Current

Defines the amount of electrical current used by the LED in mA. This is used to estimate the USB power draw. See the section on Power for more information.

## See Also

LED, Bi-colour LED, RGB LED, LEDs