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Arduino Essentials

Arduino Essentials

By : Perea
5 (5)
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Arduino Essentials

Arduino Essentials

5 (5)
By: Perea

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

The Arduino map function

Mapping a value from one range to another is a very simple thing. It's just a matter of finding which value will be at the same point of the output range as compared to the input range. Let's see it with a simple example.

If we have a possible input value of 0 to 100 and an allowed output range of 0 to 500 and we take a sample value of 75, we can say that it is at 75 percent of its input range, can't we? Well, which value will be at 75 percent of the output range, then? We will usually just make a simple correspondence:

Output Value = (Input Value x Maximum Output Value) / Maximum Input Value

Or, we will use the values in our example:

Output Value = (75 x 500) / 100 = 375

Here, 375 is just 75 percent of 500. Simple, isn't it?

It is so simple but also so common in the Arduino environment that we have a specific function to make this kind of mapping in the Arduino language, which is appropriately called the map() function.

As you can see by following...

End of Section 3
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