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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

An ambient light meter

For our first example using analog inputs, I'd propose that you build an ambient light meter: a device that indicates the amount of ambient light it can sense from its environment in some way and shows it in a visual manner, which is a perfect beginning for your next burglar detector.

For the purpose of this example, we will use a very interesting electronic device called a photocell or light-dependent resistor. A photocell is simply a specific type of resistor that varies the resistance it offers according to the amount of light it receives from its environment, exhibiting a photoconductive behavior, that is, lowering its resistance as the light increases and vice versa, commonly ranging between a few ohms when exposed to a bright light and up to some mega ohms when totally in darkness.

In the following picture, you can see a typical photocell and the usual schematic symbols you can find to refer to it:

A real photocell and its most common schematic symbols

Unlike any...

End of Section 6
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