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Arduino Essentials

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Arduino Essentials

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Arduino Essentials
Feb, 2015 | 206 pages
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Table of Contents (17 chapters)
Arduino Essentials
Arduino Essentials
Credits
Credits
About the Author
About the Author
About the Reviewer
About the Reviewer
www.PacktPub.com
www.PacktPub.com
Preface
Preface
Free Chapter
1
Meeting the Arduino Family
Meeting the Arduino Family
A game changer
Common features
Just one to rule them all
Users teaching users
Summary
2
The Arduino Development Environment
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
Interacting with the Environment the Digital Way
Digital versus analog signals
Our first circuit
Summary
4
Controlling Outputs Softly with Analog Outputs
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
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
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
Managing the Time Domain
Time control functions
Making some noise
A bigger project – a metronome
Summary
8
Communicating with Others
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
Dealing with Interrupts
The concept of an interruption
The tachograph project
A dial tachograph
Summary
10
Arduino in a Real Case – Greenhouse Control
Arduino in a Real Case – Greenhouse Control
A greenhouse controller
The greenhouse controller code
Summary
Index
Index

An ambient light meter circuit

Here, you have my proposed circuit to be used as our first analog input example:

An ambient light meter circuit schematic

It has a voltage divider consisting of the photocell and a 10K ohm load resistor as the input circuit, just like the one I showed you in the previous section.

Regarding the output part of this circuit and trying to keep things simple, I have reused the assembly of the traffic light, but this time, we will use it as a level indicator with four possible states: low, medium, high, and maximum, being represented by none, one, two, or three turned-on LEDs.

From the point of view of used pins, I have connected the three LEDs to digital pins 11, 12, and 13 and the voltage divider to analog input 0.

Breadboard connections

At this point in our work, I assume that you will be very accustomed to working with the breadboard, but in case you still have some doubts or the schematic is not clear enough for you, here you have the breadboard connection diagram...

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