O'Reilly logo

Internet of Things with Python by Gastón C. Hillar

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Using PWM plus a RESTful API to set colors for an RGB LED

Now, we will use the same source code to make it possible to change the color of an RGB LED, specifically, a common cathode RGB LED. This electronic component provides a common cathode and three anodes, that is, an anode for each of the three colors: red, green and blue. We can use our code to pulse width modulate the three colors and make the LED produce the mixed colors. We don't need to use a black surface to see the intersection of the three colors because the RGB LED mixes the three colors for us.

The following image shows a common cathode RGB LED with one of the most common configurations for the pins, where the common cathode is the second pin and the longest one.

The following table ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required