Getting Started With Arduino How To Build A Twitter Monitoring Alertuino

Getting Started With Arduino: How to build a Twitter-monitoring Alertuino Adrian McEwen - www.mcqn.com

What is Arduino?
Embedded computing platform
Open Source Hardware
Open Source Software
Easy-to-use
A way to build the “Internet of Things”
Adrian McEwen - www.mcqn.com

Common Features
Assortment of Arduinos, but most share the same common features:
16KB flash
1KB RAM
14 digital I/O pins
6 analogue I/O pins

Easy to Learn
Integrated IDE
Upload code via USB with a single click
Lots of examples to learn from
Active community sharing how they made their projects

Easy to Extend Adrian McEwen - www.mcqn.com

The Anatomy of a Sketch
The code that runs on the Arduino is called a sketch.
Two main parts:
setup()
loop()
This is the Arduino “Hello World” - Blink

The Anatomy of a Sketch: setup()
Runs once, on startup.

The Anatomy of a Sketch: loop()
Runs continually, after startup.

Seeing Blink in Action
Load Blink example in the IDE: File -> Sketchbook -> Examples -> Digital -> Blink
Click the upload button:
Watch the LED blink*
*on boards other than the Diecimila and Duemilanove you might need to connect an LED between digital pin 13 and GND

Now the real fun starts… Adrian McEwen - www.mcqn.com

Some (Very) Basic Electronic Concepts
You can think of electronics in a similar way to how you’d think of plumbing
Voltage [V]: a bit like water pressure
Current [I]: a bit like the amount of water flowing through something
Resistance [R]: a bit like the (inverse of the) diameter of a water pipe

Ohm’s Law
The only equation you’ll need to begin tinkering
Voltage = Current x Resistance
Current = Voltage / Resistance
Resistance = Voltage / Current
Learn more as you want to do more…

Tinkering With Toys
Hacking a toy ray gun to notify me when someone twitters about #barcampliverpool

Take 1 Cheap Toy Ray Gun
Battery-operated electronic toys are ideal
Takes 3 AAA batteries, so near enough to the Arduino’s 5V

Open It Up
Find the connections to bypass the switch and turn the toy on
Use 5V and GND connections on Arduino with some wires to test where the connections should go

Make New Connections
Solder the connections ideally
But you could cut the wires and connect new ones with connecting block

Parts We’ll Use
Resistor – 1K ohm (brown-black-red)

Parts We’ll Use
Transistor – basically an electronically operated switch
(we’re using a 2N2222)

Parts We’ll Use
Breadboard – easy, solderless prototyping board

Transistors in (a Bit) More Detail
Wire emitter to –ve/GND side of circuit
Wire collector to +ve side of circuit
Current will flow from collector to emitter when a voltage is applied to base

Our Circuit Adrian McEwen - www.mcqn.com

Software
Computer will fetch the data from Twitter for us
Then send the number of alerts over serial to the Arduino
The Arduino will listen for the number of alerts over serial
Then turn on the toy for 2 seconds for each alert

Alertuino Software: setup()
Runs once, on startup.

Alertuino Software: loop() Adrian McEwen - www.mcqn.com

Lets Try It
Upload the Alertuino sketch
Start the serial monitor
Send it a command
Enjoy*
*fingers crossed ;-)

Find out more
My Blog:
http://www.mcqn.net/mcfilter/
Or email adrian@mcqn.net
Buy a beginners kit:
http://tinker.it/ukstore/product_info.php?cPath=29&products_id=51
Download the software:
http://www.arduino.cc/
Learn more:
http://arduino.cc/en/Tutorial/HomePage

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Getting Started With Arduino How To Build A Twitter Monitoring Alertuino

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