December 2011
Intermediate to advanced
724 pages
16h 19m
English
Content preview from Arduino Cookbook, 2nd EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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.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.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.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.
Chapter 7. Visual Output
7.0. Introduction
Visual output lets the Arduino show off, and toward that end, the Arduino
supports a broad range of LED devices. Before delving into the recipes
in this chapter, we’ll discuss Arduino digital and analog output. This
introduction will be a good starting point if you are not yet familiar
with using digital and analog outputs (digitalWrite and analogWrite).
Digital Output
All the pins that can be used for digital input can also be used for digital output. Chapter 5 provided an overview of the Arduino pin layout; you may want to look through the introduction section in that chapter if you are unfamiliar with connecting things to Arduino pins.
Digital output causes the voltage on a pin to be either high (5 volts) or low (0
volts). Use the digitalWrite(outputPin,
value) function to turn something on or off. The function
has two parameters: outputPin is
the pin to control, and value is
either HIGH (5 volts) or LOW (0 volts).
For the pin voltage to respond to this command, the pin must
have been set in output mode using the
pinMode(outputPin, OUTPUT) command.
The sketch in Recipe 7.1 provides an
example of how to use digital output.
Analog Output
Analog refers to levels that can be gradually varied up to their
maximum level (think of light dimmers and volume controls). Arduino
has an analogWrite function
that can be used to control such things as the intensity of an LED
connected to the Arduino.
The analogWrite function is not truly analog, although it ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.