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

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The momentary push button

In the next screenshot, you can see a bunch of different momentary push buttons of two kinds:

Printed circuit board (PCB) soldering: These used to be smaller, really tiny in some cases, and they come with little legs that allow them to be soldered through holes in a PCB. In the screenshot, they are the three on the left-hand side.
Panel mounting: These are the three on the right-hand side in the picture. Usually, they come in a much bigger size than the PCB kind and come with bigger connections so that wires can be soldered to them. They usually come with some kind of nut so that they can be fixed to a panel.
Different momentary push buttons

Physical differences apart and looking at them from the connection point of view, we have to notice an important difference between both groups.

If you take a closer look at the PCB group or, even better, if you perform a simple search on the Internet, you will notice that these kinds of momentary buttons usually come with a total...

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