Physical Computing with Android

Arjan Scherpenisse

MiracleThingshttp://miraclethings.nl/

10 september 2011

Overview

Physical computing

Android

The IOIO board

About me

Mixed backgroundComputer science (AI, UvA class of 2005)

Unstable Media Art (Rietveld, class of 2009)

Have worked for Mediamatic for 3+ years

Now: independent software developer

Physical Computing

Definition:

building interactive physical systems by the use of software and hardware that can sense and respond to the analog world.

(wikipedia)

Physical Computing (2)

WorldDevice

Sensor (input)

Actuator (output)

Physcomp = popular

Many different platforms out thereArduino

Wiring

Fritzing

Phidgets

Arduino makes it easyPlug&play, accessible software, many examples

Need some electronics knowledge

hacking a knitting machine...

http://miraclethings.nl/id/852

...to knit the score board of a game

Playing ping-pong over the internet

...using a DIY pingpong-ball canon

Physcomp roundup

Lots of possibilities!

Mediamatic Atelier has sensors, motors, etc, etc, etc

Android

Popular mobile phone OS by Google

Personal Android experience

IkPod 2.0 appNexus S-based RFID multimedia guide

1.0

2.0

Personal Android experience

IkCam appmobile IkTag photo booth

Android physcomp

Google's OpenAccessory protocolWith reference implementation (ADK)

IOIO boardReleased earlier than OA

3rd-party board; needs USB debugging on

Might work with OA (beta; ymmv)

IOIO vs. OpenAccessory

IOIO's pro's:Android >= 1.6 (vs. OpenAccessory >= 2.3.x)

Filesystem access to host board

More mature (apparently)

Simpler interface on android side

OpenAccessory's pro's:Better performance (thruput/latency)

Does not require USB debugging hack

Allow apps to be notified on gadget connect

IOIO

Provides 48 input/output pins

Software runs on your phone not on the board

Many pins have extra functions

Needs external powering (Can charge the phone)

IOIO (2)

Board needs DC adapter/battery between 5-15V on VIN or directly connected to stable 5V source

Pins only supply 3.3V output

Enable USB debugging on your phone

Made With IOIO

soccer playing robothttp://www.youtube.com/watch?v=qY4b5sIrGKw

LED wekker http://www.youtube.com/watch?v=8sAvXCfEj3s

Autonomous RC carhttp://www.youtube.com/watch?v=-H6MtevUjBg

Search IOIO android on Youtube

Digital Output

Simple 3.3V digital output:Pin LED 220 GND

5V digital output:

Needs 5V-tolerant pin!

Digital Input

Input pins can be in 3 modes:Pull-up

Pull-down

Floating (need to pull up/down yourself, like Arduino)

Only put 5V input on 5V-tolerant pins!

Advanced IOIO

Analog inputsLike http://www.arduino.cc/en/Tutorial/AnalogInput

UARTCommunicate w/ other devices (e.g. arduino!) over serial port

PWManalog output, e.g. LED brightness

Demonstrate IOIO example project

Fixme.

IOIO Getting started

http://www.sparkfun.com/tutorials/280,
or in a nutshell:

Install Android Development Environment

Download IOIOLib from https://github.com/ytai/ioio

Create new Android project w/ imported IOIOLib on build path

Write your app or modify existing example

IOIO go go go

Good Luck & Have Fun!

Zotonic

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