April 2022
Beginner
960 pages
23h 12m
English
Content preview from Electronics All-in-One For Dummies, 3rd Edition
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Chapter 6
Keypads and Keyboards
IN THIS CHAPTER
Considering keypads
Discovering how keypads work
Using the Keypad library for easier keypad programming
Teaching an Arduino how to pretend to be a computer keyboard
This chapter shows you how to use a common input device called a keypad. It also shows you how to use a unique feature of some Arduino boards, including the popular Leonardo, to send information to a computer as if the Arduino were a keyboard.
Using a Keypad
A keypad is a common form of input for devices built with microcontrollers such as the Arduino. You’re probably most familiar with keypads from devices such as calculators and phones — they consist of an array of push buttons arranged in rows and columns. Figure 6-1 shows a typical keypad, with four rows of four push buttons each.
You can purchase keypads such as this one from many different suppliers, including Amazon, Jameco Electronics (www.jameco.com), and others. Just search the web for “Arduino keypad,” and you’ll find a wide variety to choose from. Simple keypads such as the one shown in Figure 6-1 cost just ...
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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.
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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.