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Get your hands dirty with Arduino
Savio Dimatteo
Heidelberg Web Enthusiasts Meetup - 10 Dec 2014

Arduino
from http://arduino.cc
“Arduino is an open-source electronics
platform based on easy-to-use hardware and
software. It's intended for anyone making
interactive projects.”
IDE
+
Board

Making a project
1. wire components on a breadboard and
connect them to arduino I/O pins

Making a project
2. write code into the IDE to read/write from/to
Arduino pins

Making a project
3. compile & upload code into a chip on the
board machine code

Many Specs
Parameters
● Input voltage
● CPU Speed
● # Analog I/O pins
● # Digital I/O pins
● FLASH capacity
● EEPROM capacity
● SRAM capacity
● USB interface
● UART

Many Specs
Parameters
● Input voltage
Cost: ~4€
● USB interface
● UART

Arduino UNO
Cost: ��25€

Arduino code
● language is an implementation of Wiring
● syntax looks like a mix of Java/C/C++
● feels almost like a scripting language...
● code preprocessed into C++
● compiled and linked against Arduino libraries
● machine code into a file ready for upload

Typical workflow
● write code
● compile
● connect Arduino via USB
● upload
● see if it works

Debugging
● write code using Serial.print(...)
● compile
● connect Arduino via USB
● upload
● open serial monitor
● see if it works, check serial monitor output

Get started
http://www.google.com http://www.instructables.com/
http://playground.arduino.cc

Starter kit (~100€)
● Arduino Projects Book
● Arduino UNO
● USB cable
● Breadboard
● Wooden Base
● 9v battery snap
● Wires
● Photoresistors, potentiometers, pushbuttons,
sensors, LCD display, LEDs, Transistors,
Optocouplers, Piezo, Small Motors, Diodes,
Resistors...

Projects book
● 01 GET TO KNOW YOUR TOOLS an introduction to the concepts you'll need to use this kit
● 02 SPACESHIP INTERFACE design the control panel for your starship
● 03 LOVE-O-METER measure how hot-blooded you are
● 04 COLOR MIXING LAMP produce any color with a lamp that uses light as an input
● 05 MOOD CUE clue people in to how you're doing
● 06 LIGHT THEREMIN create a musical instrument you play by waving your hands
● 07 KEYBOARD INSTRUMENT play music and make some noise with this keyboard
● 08 DIGITAL HOURGLASS a light-up hourglass that can stop you from working too much
● 09 MOTORIZED PINWHEEL a colored wheel that will make your head spin
● 10 ZOETROPE create a mechanical animation you can play forward or reverse
● 11 CRYSTAL BALL a mystical tour to answer all your tough questions
● 12 KNOCK LOCK tap out the secret code to open the door
● 13 TOUCHY-FEEL LAMP a lamp that responds to your touch
● 14 TWEAK THE ARDUINO LOGO control your personal computer from your Arduino
● 15 HACKING BUTTONS create a master control for all your devices!

Got rid of IDE
● mkdir blink && cd blink && ino init
● vim src/sketch.ino
● … edit … save ...
● :!ino build
● :!ino upload
● :!ino serial (optional)

Trampolino
● hardest hardware part:
insert a straw at the base of a bottle

Trampolino
● hardest hardware part:
insert a straw at the base of a bottle
● hardest software part:
try to be precise when pouring the same
amount of water...

Problem
● water doesn’t flow at a constant rate!

Problem
How many seconds to
pour for, to get the same
unit of water out of the
straw?

Possible Solution
I. measure flow rate
II. estimate pressure

Detecting water
void setup() {
pinMode(9, INPUT);
}
void loop() {
if (digitalRead(9) == LOW) {
// water detected!
}
}

Conclusions
● very easy to get started
● time consuming
● exciting
● expensive
● generally not dangerous

Thank You
● My Website: http://www.savio.dimatteo.it
● GitHub: https://github.com/darksmo
● Twitter: @darksmo
● E-mail: darksmo@gmail.com
● Trampolino: http://darksmo.github.io/arduino-trampolino/
● Arduino playground: http://playground.arduino.cc

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Get your hands dirty with Arduino

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