Make: Wearable Electronics, 2nd Edition

203Chapter 7: Sensors

There are also LEDs that can light in multiple

colors like an RGB LED. These LEDs have four

pins—three that correspond to each color and a

fourth that is either a common anode (meant to

connect to power) or a common cathode (meant

to connect to ground). The color the LED displays

depends on the intensity of the PWM signal of

each color pin.

There are a variety of ways to wear LEDs,

whether for safety, style, or making a statement.

Basic LEDs are just one way to get started with

illuminated clothing. In the following sections,

I review additional tools that can be used to

create wearable light.

RGB through-hole LED

Circuit diagram ...