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ST01 - Introduction

Introduction

Lecturer:Smilen Dimitrov

Sensors Technology – MED4

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ST01 - Introduction

Introduction

• Development of computer hardware and technology – Minituarisation– Increase of computing power– Decrease of costs

• Increase of applications

• The interaction between the human and computer – a major issue in success of an application

• Research in Human Computer Interaction (HCI)

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ST01 - Introduction

Introduction

• Basic interaction process (cycle)

• Human user expresses a command through an action – interaction input

• Computer processes the input, and calculates a result• Result is rendered into media (video and audio) understandable to

the human user – feedback – interaction output

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ST01 - Introduction

Introduction

• User experience (ease of use, satisfaction) determines the success of a computer system

• Both interaction input and interaction output are important when evaluating user experience (example: games/playability)

• Software programming: Interaction output -> rich media– Technological development -> high level software

development platforms (Java, Flash, Max/MSP, C# … )– Language closer to the human problems than machine

problems – closer to interaction issues– Relatively easy to initiate media playback (audio / video),

which were technologically problematic few decades ago– Basic tool in interaction design

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ST01 - Introduction

Traditional HCI perspective

• Need for standardization of an interaction metaphor for widely available computer systems

• Need for greater efficiency while performing tasks• Based around the standard desktop PC with standard input output

devices:– Keyboard– Mouse– Monitor– Speakers

• Development of a standardized metaphor for GUI interaction design solutions: WIMP (windows, icons, menu, pointers)

• The internal operation of keyboard and mouse as input devices is not discussed as a basis for developing a HCI design – their proper operation is assumed and taken for granted

• The designers have direct and transparent access to them through their chosen software development platform

• Goal – to evaluate user experience; to maximize efficiency and ease of use given the limited range of actions the user can make with the interface

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ST01 - Introduction

Traditional HCI perspective

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ST01 - Introduction

Development of traditional HCI perspective

• Traditional HCI based on keyboard / mouse offers a limited range of actions to the user

• The development of technology – minimization of the PC– Desktop (stationary)– Laptop (portable)– Palmtop (wearable) -> mobile phone

• The traditional keyboard / mouse interaction metaphor is difficult to implement in smaller devices

• Research into new and different modes of human computer interaction, allowing a greater range of actions, the user can undertake

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ST01 - Introduction

Development of traditional HCI perspective

• New interaction demands from – Minituarisation trends– Performing / stage arts – dance, music, theater– Gaming industry – traditionally in this field, since early days –

joystick interaction

• Extension of the bounds of traditional HCI

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ST01 - Introduction

Development of traditional HCI perspective

• Start from realization that keyboard / mouse represent sensing systems

• New interactive actions for the user – application of different sensors

• New trends in HCI• 1.      Ubiquitous Computing (Ubicomp) systems • 2.      Speech and audio input • 3.      Gesture-based input • 4.      Tangible Interfaces or ‘Phicons’ (Physical Icons) • 5.      Context Aware computing

• Sensors Technology (ST) answers this perspective: to introduce basic theory and skills, for analysis, construction and utilisation of a simple sensor device – to be used as interaction input device in a larger computer system

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ST01 - Introduction

Context of ST (model)

• Report and project issues

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ST01 - Introduction

Data acquisition

• Not much focus here – electronic measurements in electronic engineering

• We use Teleo Intro board as data acquisition board• Parameters of interest – number channels, input range, sampling

rate and resolution

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ST01 - Introduction

Context of ST

• Sensing circuit -> introduction to basic electronic theory (biggest part of ST)– Goal – to build and use the circuit yourself

• Software programming -> where most of the other semester practices are alpplied.

• Complex sensors – microphone, video camera– Cannot build them – must build additional simple circuit for the

MED4 project.

• Sensor array / remote sensing • Sensor transducer• Keyboard / mouse / soundcard at the PC