March 2017
Beginner to intermediate
422 pages
8h 4m
English
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Setting up brightness using PWM
Pulse wave modulation, or PWM is a technique where the power is oscillated between on and off at a certain frequency. There are several applications for this. In this recipe, we will start off easy and see how it can control the perceived brightness of an LED. By changing the oscillation frequency using PWM, we can flicker an LED to give the effect of changing brightness. Let's try it out!
Getting ready
- Check the current board and mode configuration.
Note
If you have SPI or I2C enabled, make sure not to use the pins that are reserved for that mode.
- The following example uses pins still available while in SPI mode, and it should work for just about any configuration that you have for your GPIO as long as you aren't using ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.