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Arduino Essentials

You're reading from   Arduino Essentials Enter the world of Arduino and its peripherals and start creating interesting projects

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Product type Paperback
Published in Feb 2015
Publisher Packt
ISBN-13 9781784398569
Length 206 pages
Edition 1st Edition
Tools
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Toc

Table of Contents (12) Chapters Close

Preface 1. Meeting the Arduino Family 2. The Arduino Development Environment FREE CHAPTER 3. Interacting with the Environment the Digital Way 4. Controlling Outputs Softly with Analog Outputs 5. Sensing the Real World through Digital Inputs 6. Analog Inputs to Feel Between All and Nothing 7. Managing the Time Domain 8. Communicating with Others 9. Dealing with Interrupts 10. Arduino in a Real Case – Greenhouse Control Index

A dial tachograph


For a more complete example in this section, we will build a tachograph, a device that will present the current revolutions per minute of the motor in a visual manner by using a dial.

The motor speed will be commanded serially from our computer by reusing some of the codes in our previous projects.

It is not going to be very complicated if we include some way to inform about an excessive number of revolutions and even cut the engine in an extreme case to protect it, is it?

The complete schematic of such a big circuit is shown in the following image. Don't get scared about the number of components as we have already seen them all in action before:

The tachograph circuit

As you may see, we will use a total of five pins of our Arduino board to sense and command such a set of peripherals:

  • Pin 2: This is the interrupt 0 pin and thus it will be used to connect the output of the optocoupler.

  • Pin 3: It will be used to deal with the servo to move the dial.

  • Pin 4: We will use this pin...

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