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Arduino for Kids

You're reading from   Arduino for Kids A cool guide to help kids develop robots and electronics

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Product type Paperback
Published in Mar 2017
Publisher Packt
ISBN-13 9781785884818
Length 218 pages
Edition 1st Edition
Tools
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Authors (3):
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Rishi Gaurav Bhatnagar Rishi Gaurav Bhatnagar
Author Profile Icon Rishi Gaurav Bhatnagar
Rishi Gaurav Bhatnagar
Priya Kuber Priya Kuber
Author Profile Icon Priya Kuber
Priya Kuber
Vijay Varada Vijay Varada
Author Profile Icon Vijay Varada
Vijay Varada
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Table of Contents (11) Chapters Close

Preface 1. The World around Us FREE CHAPTER 2. Systems and Logic 3. Components and Connections 4. The Magic Wand 5. Hello World! 6. Safety Box 7. Make a Friend 8. Save Energy 9. High 5! 10. Plant, Meet Arduino!

Reading analog data


We mentioned earlier that the Arduino takes in digital data, which means that it can only handle numbers.

But what can we do for cases when we have an infinite number of possibilities, like light levels which cannot be quantified as a 0 or a 1, or ON and OFF?

Data like these which are continuous in nature, and do not have discrete or distinct levels are known as analog data. These signals in terms of voltage do not exist only at 0V or 5V, but vary between these two levels.

How do we go about reading such a continuous data then? Worry not, and remember, for all our problems, there's always a solution, we only need to think harder and explore.

ADC to the rescue!

An ADC, or an Analog-to-Digital converter is a circuit that converts voltages that are analog in nature to digital form.

The Arduino Uno has a 10 bit ADC inside it, which means it can convert an analog input voltage range, 0 to 5 volts, to a digital value between 0 and 1023 (2^10, hence 10-bit!).

The following table shows...

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