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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

Sensing analog values

In Chapter 4, Controlling Outputs Softly with Analog Outputs, we talked about digital to analog conversion and the use Arduino makes of its internal DAC when generating analog outputs. In this chapter, we need to know about the DAC cousin, the Analog to Digital Converter (ADC).

An ADC is a device with just the opposite mission of a DAC, that is, a device that takes a signal that can theoretically have an infinite number of states and convert it to just a few concrete values, or in Arduino jargon, takes an analog signal and converts it to a digital value.

Just like the DAC, the Arduino board comes with a six-channel ADC with a 10-bit resolution for each channel. This means that we can deal with up to six different analog signals ranging from 0V to 5V that will be converted to values between 0 and 1024.

If you remember from Chapter 4, Controlling Outputs Softly with Analog Outputs, the DAC had just an 8-bit resolution, allowing for values between 0 and 255, so we will...

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