Laboratory 7: Sensors Matthew R. Gaglio, Feb 2007.

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Presentation transcript:

Laboratory 7: Sensors Matthew R. Gaglio, Feb 2007

Overview Objective Background Materials Procedure Report / Presentation Closing

Objectives Design two sensor programs Mindstorms: use sensors to stop a motor when a red ball is detected LabVIEW: use a thermocouple to measure temperature in a heating and cooling program Apply sensors to Semester-Long Design Projects

Concept : Control Systems System created to read and analyze data Use analyzed data for appropriate action Examples: Thermal controls Lighting systems Alarm systems Motion sensors

Concept: Sensors Sensors Some sensor types: Read data from test environment Data converted to digital format for computer Some sensor types: Light Temperature Ultrasonic Touch Sensors connect to different control devices: Lego sensors -> NXT Thermocouple -> DAC -> PC

Materials Mindstorms sensor program LabVIEW sensor program NXT Test assembly Computer with Mindstorms LabVIEW sensor program Computer with LabVIEW + DAC Thermocouple

Procedure: Mindstorms Sensor Program Part A Port 1 touch sensor Starts program Starts motor on Port A Reverses direction of motor Port 2 touch sensor Stops motor on Port A Ends program Port B motor Varies speed of Port A motor

Procedure: Mindstorms Sensor Program Part B Port 3 ultrasonic sensor Reverse direction of motor when greater than 20cm from wall Reverse direction of motor when less than 8cm from wall

Procedure: Mindstorms Sensor Program Part C Port 4 light sensor Stops motor when red ball is detected (value greater than 45) Ends program

Procedure: LabVIEW Sensor Program Design (based on VI from LabVIEW Lab) Back Panel – Add “AI Sample Channel.vi” Name the channel “thermocouple” Receives input from thermocouple Change thermometer to indicator Display input Testing and Data Insert thermocouple wires Yellow wire -> Pin 3 of DAC Orange wire -> Pin 4 of DAC Have TA test your program Take screenshot of Front and Back Panels

Assignment: Report/Presentation No report for this lab No Presentation for this lab Milestone 2 due next recitation

Closing Have all lab notes signed by TA Each team member should have turn using software Return all unused materials to TA