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Arduino Essentials

Arduino Essentials

By : Perea
5 (5)
Buy this Book
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Arduino Essentials

Arduino Essentials

5 (5)
By: Perea
Buy this Book

Overview of this book

If you are a hobbyist who wants to develop projects based on Arduino as the main microcontroller platform or an engineer interested in finding out what the Arduino platform offers, then this book is ideal for you. Some prior knowledge of the C programming language is required.
Table of Contents (12 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Reader feedback
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Customer support
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Disclaimer
Free Chapter
1
1. Meeting the Arduino Family
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1. Meeting the Arduino Family
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A game changer
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Common features
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Just one to rule them all
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Users teaching users
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Summary
2
2. The Arduino Development Environment
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2. The Arduino Development Environment
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A multiplatform tool
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Downloading the package
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Installing the software
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Installing the drivers
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Running the Arduino development environment for the first time
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Preflight checks
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Uploading our first sketch
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Main menus and commands
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The Arduino language
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Summary
3
3. Interacting with the Environment the Digital Way
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3. Interacting with the Environment the Digital Way
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Digital versus analog signals
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Our first circuit
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Summary
4
4. Controlling Outputs Softly with Analog Outputs
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4. Controlling Outputs Softly with Analog Outputs
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Dealing with analog signals
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The analog output circuit
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Connections diagram
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Analog control through code
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Motor control with a transistor
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Summary
5
5. Sensing the Real World through Digital Inputs
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5. Sensing the Real World through Digital Inputs
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Sensing by using inputs
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Connecting a button as a digital input
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The momentary push button
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Complete circuit schematic
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Breadboard connections diagram
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Writing code to react to a press
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Timing and debouncing
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Other types of digital sensors
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Using an optocoupler as a coin detector
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The schematic of the coin detector
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The breadboard connections diagram
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The complete example code
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A real working project
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Summary
6
6. Analog Inputs to Feel Between All and Nothing
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6. Analog Inputs to Feel Between All and Nothing
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Sensing analog values
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The Arduino map function
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An ambient light meter
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An ambient light meter circuit
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DC motor speed control revisited
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Summary
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7. Managing the Time Domain
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7. Managing the Time Domain
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Time control functions
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Making some noise
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A bigger project – a metronome
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Summary
8
8. Communicating with Others
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8. Communicating with Others
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Serial communications concepts
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Other types of serial communication
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Calibrating sensors serially
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Sending data to Arduino
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A computer connected dial thermometer
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Summary
9
9. Dealing with Interrupts
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9. Dealing with Interrupts
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The concept of an interruption
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The tachograph project
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A dial tachograph
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Summary
10
10. Arduino in a Real Case – Greenhouse Control
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10. Arduino in a Real Case – Greenhouse Control
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A greenhouse controller
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The greenhouse controller code
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Summary
11
Index
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Index

Timing and debouncing

If you play a little with the previous circuit once programmed, you can easily conclude that the reaction to the button press is not immediate, and it is due to the fact that in the code, the button press is only read once the reaction, blinking or fading, has concluded and both of them take their time, even if short.

In Chapter 9, Dealing with Interrupts, we will see another way to react immediately to these kinds of events through the use of a very powerful procedure called interrupts.

There is another final consideration with respect to this example that is called debouncing, and that is due to the physical way in which electrical contacts are made when pressing a button.

Although it's hard to imagine, when you press a button, the state oscillates between on and off before the contact settles down, which can lead to incorrect readings of a sensor in the code.

You can learn more about switches and debouncing them on the Wikipedia page for switches at http://en.wikipedia...

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