Search icon CANCEL
Subscription
0
Cart icon
Your Cart (0 item)
Close icon
You have no products in your basket yet
Arrow left icon
Explore Products
Best Sellers
New Releases
Books
Videos
Audiobooks
Learning Hub
Free Learning
Arrow right icon
Arrow up icon
GO TO TOP
Raspberry Pi Zero Cookbook

You're reading from   Raspberry Pi Zero Cookbook Delve into the practical world of the Raspberry Pi Zero

Arrow left icon
Product type Paperback
Published in Mar 2017
Publisher Packt
ISBN-13 9781786463852
Length 422 pages
Edition 1st Edition
Languages
Arrow right icon
Author (1):
Arrow left icon
Edward Snajder Edward Snajder
Author Profile Icon Edward Snajder
Edward Snajder
Arrow right icon
View More author details
Toc

Table of Contents (11) Chapters Close

Preface 1. Kick-Start Your Raspberry Pi Zero FREE CHAPTER 2. Setting Up Physical and Wireless Connections 3. Programming with Linux 4. Programming with Python 5. Getting Your Hands Dirty Using the GPIO Header 6. Controlling the LEDs and Displays 7. Controlling the Hardware 8. Taking Digital Inputs to the Raspberry Pi Zero 9. Interfacing Sensors with the Raspberry Pi Zero 10. Cooking up Projects to Amaze the World!

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

  1. 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.

  2. 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 GPIO 22, 23, and 24.

  3. We're going to be using Python and the RPi.GPIO library. If you haven't set that up, you'll find all of the information you need in Chapter 5, Getting Your Hands Dirty Using GPIO Header.

How to do it...

  1. Here is the circuit to...

lock icon The rest of the chapter is locked
Register for a free Packt account to unlock a world of extra content!
A free Packt account unlocks extra newsletters, articles, discounted offers, and much more. Start advancing your knowledge today.
Unlock this book and the full library FREE for 7 days
Get unlimited access to 7000+ expert-authored eBooks and videos courses covering every tech area you can think of
Renews at $19.99/month. Cancel anytime
Banner background image