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Lecture 2

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Interactive Arts & Tech
IAT 267
Helmine Serban

Interaction with Computer Systems Most people see computer system with -screen -keyboard -mouse Computers make things interactive Computing as a Medium Can store sound and images Random access media-non-sequential parts of a computer memory which can be called up as if they were next to each other Reduces the barriers of time and space -networking Creates more complex relationships between sensed events and caused events E.g. automatic blinds, automatic light switch Interaction -creates a rich conversation between physical world and the virtual world of the computer Transduction-the conversion of one form of energy into another E.g. physical energy to electrical signals Transduction Physical world-various forms of energy E.g. mechanical, light, pressure, etc. Computer system-electrical energy Transducers-devices which will convert between physical energy and electrical energy Interaction-an iterative process of listening, thinking, and speaking between two or more actors Listening -> Input Thinking -> Processing Speaking -> Output E.g. Automatic blinds Input: sun Processing: light threshold Output: lowering or raising of blinds E.g. Automatic lights Input: person entering room Processing: proximity sensor, switch a person steps on Output: lights turn on or off Transducers for Input and Output Input: sensors E.g. switches, levers, sliders Output: actuators E.g. motors, buzzers Input, Processing, and Output has to do with energy flow Input takes less energy than output -it takes less energy to sense activity than to move things Processing requires a computer to read the input, make a decision and activate an output -requires programming Output often requires electrical and mechanical skills -light sound, movement Digital and Analog Digital-limited number of states (usually 2) -whether or not E.g. is it raining outside? (Yes/no) Analog-continuous range of multiple states -how much stronger, faster, brighter E.g. how warm is it outside? Parallel and Serial -how input and output flows over time Serial-events are happening one after another Parallel-events are happening simultaneously Electrical current can flow through components serially or in parallel Computers can exchange bits of information serially or in parallel as well Building a Project Using a Computer System 1) Describe first what you want to happen -in plain language -from the point of view of the person experiencing what you are making such as what they see, hear, feel, or can do -describe what changes as the person takes different actions -why the system is engaging to the person/how the events should unfold to keep the person engaged Focus the description on what happens not how it happens Do not think technology at the stage 2) Break your project down into the stages of input, processing, and output 3) Identify your input and output as analog or digital 4) Begin your search from transducers 5) Describe the sequence of events Tools of Interaction Making the Connection between the Physical World and the Digital World 1) Assemble Circuits 2) Connect Circuits to the computer 3) Write software for the computer 4) Enable computers to communicate with each other Electrical Circuit Must be in a closed loop Contains a source of
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