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Computer Interfaces in The Classroom Sensors Output a voltage or a current signal in response to an applied stimulus. Function Types: Electronic Devices Electrodes Transducers Transducers A device that is actuated by power from one system and supplies power, usually in another form ( small electrical signal ), to a second system. Types according to energy source: Passive ( Piezoelectic ) Active ( battery or external power ) Transducer Types measurands Mechanical Force, Pressure, Flow Electromagnetic Magnetic, Hall effect, Piezoelectric Temperature Thermal Expansion, Thermocouples, Resistance effects, Junction effects, Optical Sensor Types Many are classified according to transducer type used: strain gages, thermistors, etsc Others classified according to measurand; ie: position sensors, light sensors, etc. According to output connector: Analog (5-pin DIN, 8-pin DIN) Digital Interface Boxes Functions: Sample electrical signals from sensors ( when ordered to by computer ), Provide signal conditioning, Digitize signal, Store data temporarily, Send data to computer Interface Inputs Number of analog and digital inputs Are all analog inputs identical?? Acquisition rates Amplification Are analog inputs 5-pin or 8-pin DIN? Amplification Higher amplification allows you to sample smaller signals, More amplification choices allow you to better match sensor output range to situation, Typical values: 1, 10, 50, 100 Acquisition Rates How many data points can be collected and stored per second?? Warning: Not the same as monitoring rates. Typical values up to: 11,000 50,000 Datawidth How many data points can be collected in a single pass?? Typical maximum values: 512 1024 2048 Triggering Controlling when data collection begins. Types: Analog signal level External digital input Data Transmission Serial Cables Baud rates: 38 K, 56 k, 115 K, Internal Computer Bus Cards Universal Serial Bus ( USB ) Computer Software Controls the Interface box. Displays data in graphical and/or table form. Provides data analysis tools: Curve fitting, calculus functions, etc. Some word processing, spread sheet capabilities.
