Thursday Week 1: Physical Computing Theory and Practice of...
Transcript of Thursday Week 1: Physical Computing Theory and Practice of...
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Thursday Week 1: Physical Computing
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Theory and Practice of Tangible User Interfaces
Physical ComputingIntroduction
week 01
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How the Computer Sees UsShall we take a better look at ourselves to see our full range of expression?
Illustration from O’Sullivan and Igoe
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Thursday Week 1: Physical Computing
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Theory and Practice of Tangible User Interfaces
Physical ComputingA conversation between the physical world and the virtual world of the computer.
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Input and Output
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Theory and Practice of Tangible User Interfaces
Input and Output
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TransductionThe conversion of one form of energy into another
Arduino
Illustration adapted and modified from O’Sullivan and Igoe
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Transducers
output transducersActuators (e.g., motors, buzzers)
input transducerssensors (e.g., switches, levers, sliders, etc.)
Arduino
Illustration adapted and modified from O’Sullivan and Igoe
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Microcontrollers
output transducersActuators (e.g., motors, buzzers)
input transducerssensors (e.g., switches, levers, sliders, etc.)
Arduino
Illustration adapted and modified from O’Sullivan and Igoe
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Digital and AnalogDigital = “whether or not”
(Is the cat on the mat or not?)
Analog signal = “how much”
or “stronger”
“faster”
“brighter”
(How heavy is the cat that’s on the mat?)
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Word of Caution: Your Idea is Important1.
Don’t get trapped in technological seduction
2.
Don’t spin your wheels for so long that you give up your project. There might be an alternative way that makes things easier.
Work at a high level. Talk to us. Ask other people. Take frequent breaks.
From O’Sullivan and Igoe
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Working with ArduinoAn open-source electronics prototyping
Create interactive objects and environments
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Theory and Practice of Tangible User Interfaces
What is ArduinoA tiny computer you can program, for rapid prototyping
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Thursday Week 1: Physical Computing
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Theory and Practice of Tangible User Interfaces
Arduino as an Interface Board
Illustration adapted and modified from O’Sullivan and Igoe
Arduino
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Thursday Week 1: Physical Computing
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Theory and Practice of Tangible User Interfaces
Arduino as an Interface Board
Illustration adapted and modified from O’Sullivan and Igoe
Arduino
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Thursday Week 1: Physical Computing
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Theory and Practice of Tangible User Interfaces
Arduino as an Embedded Computing Device
Illustration adapted and modified from O’Sullivan and Igoe
Arduino
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What is ArduinoRelatively cheap (compare with LEGO Mindstorm)
$250 ~$31
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What is ArduinoIt used to be a bit more complicated…
image from www.tangentsoft.net/elec/breadboard.html
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Open source, so you can build one yourself!
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Thursday Week 1: Physical Computing
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Theory and Practice of Tangible User Interfaces
Arduino Board Overview
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Arduino Board Overview•
8 kBytes
of Flash program memory•
1 kByte
of RAM•
12 MHz (Apple II: 1 MHz)
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Arduino Board Overview•
13 digital input/output pins
•
5 analog input pins
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Thursday Week 1: Physical Computing
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Theory and Practice of Tangible User Interfaces
Arduino Board Overview
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Theory and Practice of Tangible User Interfaces
Arduino Board Overview•
USB to serial
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Thursday Week 1: Physical Computing
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Theory and Practice of Tangible User Interfaces
Arduino Software
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Thursday Week 1: Physical Computing
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Theory and Practice of Tangible User Interfaces
Arduino Software
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Thursday Week 1: Physical Computing
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Theory and Practice of Tangible User Interfaces
Arduino Programming Cycle
edit
upload
run verify
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Thursday Week 1: Physical Computing
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Theory and Practice of Tangible User Interfaces
Arduino Programming Cycle
edit
upload
run verify
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Thursday Week 1: Physical Computing
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Theory and Practice of Tangible User Interfaces
Arduino Programming Cycle
edit
upload
run verify
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Thursday Week 1: Physical Computing
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Theory and Practice of Tangible User Interfaces
Arduino Programming Cycle
edit
upload
run verify
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Thursday Week 1: Physical Computing
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Theory and Practice of Tangible User Interfaces
Arduino Programming Cycle
Watch your LED blink!
edit
upload
run verify
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Arduino ProgramProgram consists of 3 parts:
1. Declare
variables at top
2. Initialize
setup() –
run once at beginning, set pins
3. Run
loop() –
run repeatedly, after setup()
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Arduino LanguageLike C but easier
Example functions
•
pinMode() –
set a pin as input or output•
digitalWrite() –
set a digital pin high/low
•
digitalRead() –
read a digital pin’s state•
analogRead() –
read an analog pin•
analogWrite() –
write an “analog”
PWM value
•
delay() –
wait an amount of time
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Example (and many other examples at www.arduino.cc)
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Example (and many other examples at www.arduino.cc)
Declare variables
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Example (and many other examples at www.arduino.cc)
Initialize
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Example (and many other examples at www.arduino.cc)
Run
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Thursday Week 1: Physical Computing
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Theory and Practice of Tangible User Interfaces
Arduino and Breadboard
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Theory and Practice of Tangible User Interfaces
Arduino and Breadboard
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Theory and Practice of Tangible User Interfaces
Solderless
Breadboard
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Thursday Week 1: Physical Computing
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Solderless
Breadboard
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Solderless
Breadboard
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Circuits: Avoid ShortcutsElectricity always favors the path of least resistance to ground
Illustration from O’Sullivan and Igoe
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Thursday Week 1: Physical Computing
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Circuits: Avoid ShortcutsElectricity always favors the path of least resistance to ground
Illustration from O’Sullivan and Igoe
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CircuitsAll the electrical energy in a circuit must be used
Illustration from O’Sullivan and Igoe
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LED•
LED = Light-Emitting Diode
•
Needs a “current limiting”
resistor, or burns out
Illustration from Tod
Kurt’s Spooky Projects
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Circuits SummaryAvoid deadly shortcuts
•
Flows to the lowest resistance•
All the electrical energy in a circuit must be used
When in doubt, talk to us, we can help
(Your Arduino has some fail safe, but in the worst case, you could fry your board [$31.00])
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Try to be NeatColor code:
•
Red: power•
Black: ground
Be consistent
Good Bad
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Be Careful
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Homework This Week•
Get the course lab kit
•
Download & install Arduino software (www.arduino.cc)
•
Make an LED blink
•
Create your course web account
•
Post the photo of your board and an optional comment on the course website
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Homework: Blinking LED
Resistorred, red, brown, gold
LED
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Homework looks like thisLEDShorter leg groundPolarity matters
220 ohm resistorred, red, brown, goldPolarity does not matter
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Course Kit
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Next ThursdayDon’t forget to bring your lab kit in
Do use the lab hour to catch up
Create your course account
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Thursday Week 1: Physical Computing
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Theory and Practice of Tangible User Interfaces
Thanks!