5. Sensing the Real World through Digital Inputs | Arduino Essentials

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Arduino Essentials

By : Perea

5 (5)

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.

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. 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. 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. Interacting with the Environment the Digital Way

3. Interacting with the Environment the Digital Way

Digital versus analog signals

Our first circuit

Summary

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. 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. Analog Inputs to Feel Between All and Nothing

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. Managing the Time Domain

7. Managing the Time Domain

Time control functions

Making some noise

A bigger project – a metronome

Summary

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. Dealing with Interrupts

9. Dealing with Interrupts

The concept of an interruption

The tachograph project

A dial tachograph

Summary

10. Arduino in a Real Case – Greenhouse Control

10. Arduino in a Real Case – Greenhouse Control

A greenhouse controller

The greenhouse controller code

Summary

Index

Index

The breadboard connections diagram

Regarding the breadboard connections, they are a little more complex this time due to the fact that the optocoupler housing of the Fritzing part I used was a little too big for the breadboard, so I've had to use some extra wires.

That apart, please keep in mind that the exact optocoupler you may find might not have the same pin distribution as the one used in this diagram, and you should refer to your specific component datasheet to adapt the wiring connections to your optocoupler or you could easily damage it.

A breadboard connections diagram for the optical switch example

In the optocoupler used in the diagram, the upper connections correspond to the phototransistor and the lower ones to the infrared LED emitter.

CONTINUE READING

83

Tech Concepts

36

Programming languages

73

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