8. Communicating with Others | 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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Calibrating sensors serially

In Chapter 6, Analog Inputs to Feel between All and Nothing, I promised you that I'd show you how we can use a serial communication to calibrate the analog sensors you could connect to your projects, in particular in the ambient light meter and the motor speed control projects.

The time has now come to revisit these projects and finally unveil how we got the correct output range for the mapping we made in these projects.

If you remember, we used the following circuit for the ambient light meter as shown in the following image:

Ambient light meter circuit schematic

In the sketch, we had to read the photocell value and map it to a four-state output range with the following lines of code:

…
void loop(){
  // Read the sensor and convert the value to
  // one of the four states we will use
  value = analogRead(photocell);
  state = map(value,0, 200, 1, 4);
  // acts depending on the obtained states
  switch(state){
      case 1:
...

At that time, I didn't tell you how I...

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