Making things sense - Day 1 (May 2011)

Making things sense
Urban sensing and physical computing
Day 1 (7-8 May 2011)

Markus Rittenbruch
QUT Urban Informatics / FAST & NICTA

Schedule - Day 1
• 12:00 - 12:20 Introduction

• 12:20 - 13:30 Getting started

• 13:30 - 13:45 Short Break

• 13:45 - 14:15 Basic electronics

• 14:15 - 15:00 Arduino in detail

• 15:00 - 15:30 Coffee break (Lumia)

• 15:30 - 15:50 Introduction Activity

• 15:50 - 16:50 Activity

Schedule - Day 2
• 12:00 - 12:10 Introduction

• 12:10 - 12:30 Analogue sensors

• 12:30 - 13:00 Activity

• 13:00 - 14:00 Sharing sensor data

• 14:00 - 14:10 Short break

• 14:10 - 16:10 Project activity

• 16:10 - 16:50 Project presentations

• 16:50 - 17:00 Wrap up

http://www.tangibleinteraction.com

http://www.arduino.cc/playground/Main/CoffeeTronics

http://diydrones.com/proﬁles/blog/show?
id=705844%3ABlogPost%3A44817

http://www.slq.qld.gov.au/whats-on/lumia

Slides

Day 1 http://www.slideshare.net/markumoto

Day 2 http://www.slideshare.net/markumoto

Physical computing

• Transduction
• Transforming energy

• Digital and analog

• Parallel and serial

• Stages of input, output and
processing

Overview
• Workshop hardware components

• Parts: http://www.littlebirdelectronics.com/ http://toysdownunder.com/

• Physical computing

• Arduino board

• Arduino code

• Arduino IDE

• Writing a program

• Download and install Arduino

• Arduino Hello World / Blink

• Tutorials: http://www.ladyada.net/learn/arduino/index.html
http://www.sparkfun.com/commerce/tutorials.php

Arduino overview
(Atmega8U2)

Arduino is an open-source electronics prototyping platform based on flexible, easy-to-use hardware and
software. It's intended for artists, designers, hobbyists, and anyone interested in creating interactive objects
or environments.
The boards can be built by hand or purchased preassembled; the software can be downloaded for free. The
hardware reference designs (CAD files) are available under an open-source license, you are free to adapt
them to your needs.

Arduino speciﬁcation
• Arduino Uno (2011)

• Microcontroller
ATmega328
• DC Current for 3.3V Pin
• Operating Voltage 5V 50 mA

• Input Voltage • Flash Memory 32 KB of
(recommended) 7-12V which 0.5 KB used by
bootloader
• Input Voltage (limits)
• SRAM 2 KB
6-20V

• Digital I/O Pins 14 • EEPROM 1 KB

• Analog Input Pins 6 • Clock Speed 16 MHz

• DC Current per I/O Pin
40 mA

Other platforms

Phidgets

I-CubeX
Wiring
Stamp

Arduino code
• Code in a C-like high-level language (Wiring)

• Inbuilt functions to read and set digital and analog
inputs and outputs

• Includes libraries to perform common hardware
or software tasks

• Sketches

• Many language bindings:
• Flash & Flex, Processing, Python, Ruby, Java,C. C++,
Objective-C, .NET

Blink circuit

Connections

Schematic

LED: Anode / Cathode

Arduino IDE install
• Install Arduino 22 (http://www.arduino.cc/en/
Guide/HomePage)

• (Install USB driver)

• Select serial port

• Select board

• Examples: Blink

• Compile and upload process

• Write to Serialport

Blink modiﬁcations
1. Talk to the serial console

2. Experiment with intervals

3. Change 4. Try this!
pins

Basic electronics
• Water analogy

Basic electronics
• Current,Voltage and Power
• Voltage is measured in Volts (V) → V

• Current is measured in Amperes (A) → I

• Power is measured in Watts (W) → P

• Power = Current x Voltage (P = I x V)

• Arduino
• 5V (or 3.3V)

• 40mA (0.04A) output pin

• Direct current (DC) and alternating current (AC)

• Mains is nasty!

Basic electronics
• Electricity ﬂow
• Path of least resistance

• All electrical energy must
be used

• Basic electrical circuit
• Components in series

• Same current, decreasing voltage

• Components in parallel
• Different current, same voltage

• Short circuit

Basic electronics
• Schematic / Circuit diagram

Basic electronics
• Resistor
• Conductors, insulators and resistance
• Resist the ﬂow of electricity (current)
• Precise control of electrical current
• Measured in Ohm (1Ω - 1MΩ)
• Symbol
• Colour-code

Basic electronics
• Types of resistors
• Thermistor

• Photocell (LDR)

• Potentiometer (trim
pot, variable resistor)

• Force sensitive resistor
(FSR)

• Flex sensor

Basic electronics
• Resistor and resistance

• Resistors in series

• R = R1 + R2

• Resistors in parallel

• R = R1 x R2 / (R1 + R2)

Basic electronics

• Diodes and LEDs
• Diodes are polarised
• Electricity ﬂows in one
direction
• Anode (+), Cathode (-)
• LED (Light-emitting diode)

Basic electronics
• Ohm’s law and current limiting
V
I R
Ohm’s triangle
R =V / I
I =V / R
V=IxR

• Data sheets are your friend!

Adjusting brightness

http://www.ladyada.net/learn/arduino/LEDs.html

Basic electronics
• Capacitor
• Store electricity

• Farad (F) (mF or μF, pF, nF)

• Polarised , unpolarised

• Ceramic, tantalum, electrolytic

• Common sizes:
• 22pF / 0.01μF / 0.1μF ceramic

• 1μF / 10μF electrolytic

Basic electronics
• Capacitors

• Capacitors in series

• C = C1 x C2 / (C1 + C2)

• Capacitors in parallel

• C = C1 + C2

Overview
• Digital pins

• Pull-up and pull-down resistors

• Analogue input pins

• Pulse with modulation (PWM)

• Other
• ICSP

• Interrupts

• I2C communication

• Analogue reference

Digital pins
• Pins 0-13 (GPIO pins)

• Either input our output (default to input)

• Can output 40 mA

• pinMode

• digitalWrite

Digital pins
• digitalRead (http://www.ladyada.net/learn/arduino/
lesson5.html)

Digital pins
• digitalRead

/*
* Switch test program
*/
int switchPin = 2; // Switch connected to digital pin 2

void setup() // run once, when the sketch starts
{
Serial.begin(9600); // set up Serial library at 9600 bps
pinMode(switchPin, INPUT); // sets the digital pin as input to read switch
}

void loop() // run over and over again
{
Serial.print("Read switch input: ");
Serial.println(digitalRead(switchPin)); // Read the pin and display the value
delay(100);
}

Digital pins
• Pull-up and pull-down resistors

Pull-up

Pull-down

Digital pins
• Arduino schematic / Reset

Digital pins
• What happens if we digitalRead a pin that is not connected?

• 20K internal pull-up resistor

• Serial pins 0 (RX) and 1 (TX). Connected to FTDI USB-to-TTL

• Pin 13 is different (input) (RES + LED)

• Analogue pins A0-A5 can be used as digital pins 14-19 (GPIO)

• Read up to 5V. Don’t fry your pin!

Analogue input pins
• Pins A0-A5

• 6 channel analog-to-digital (A/D) converter

• 10 bit resolution (from 0-5V to int 0-1023)

• 100 microseconds (0.0001 s) to read an analog input,
maximum reading rate is about 10,000 times a second.

• Pull-up resistor same as digital pins

• Unexpected readings?

• Has pin been set to input?

• Check pull-up resistor [digitalWrite(A0, HIGH); ]?

Analogue input pins
• AnalogRead (use A1 instead of 1)

Pulse with modulation
• PWM used to create analogue output on digital pins

• Simulate voltage between 5V and 0V using square waves
(signal switching between on and off)

• Pins 3, 5, 6, 9, 10, and 11

Other pins
• ICSP (In Circuit Serial Programming) directly
program AVR micro-controllers

• I2C / TWI (Two-wire interface) communication
• Inter IC control

• Arduino analog input A4 = I2C SDA (serial data line)

• Arduino analog input A5 = I2C SCL (serial clock line)

• External interrupts
• Event-handling without polling

• Interrupt 0 (on digital pin 2) and 1 (on digital pin 3)

• Analogue reference
• Set analogue reference for ADC

Activity overview
• Pair up

• Use a switch & LED

• Use a poti & LED

• Design challenges: http://www.ladyada.net/learn/arduino/
lesson5.html

• Draw a circuit diagram

• Fade 2 LEDs

• Use multicolour LED

• http://www.arduino.cc/en/Reference/HomePage

• [Use your digital temperature sensor]

Making things sense - Day 1 (May 2011)

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