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Controlling Technology Systems

8 th Grade. Controlling Technology Systems. Objective: Understand that controls are mechanisms or activities that use information to cause systems to change. Warm up: What are the different input and output motions for the mystery machine?. Left (in and out) Right (in and out) Up Down

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Controlling Technology Systems

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  1. 8th Grade Controlling Technology Systems

  2. Objective: Understand that controls are mechanisms or activities that use information to cause systems to change • Warm up: What are the different input and output motions for the mystery machine? • Left (in and out) • Right (in and out) • Up • Down • Sweep (windshield wiper)

  3. Analytical vs. Judgmental • Analytical System – systems that mathematically or scientifically make comparisons. • Judgmental Systems – systems that use human opinions and values. • Judgment may be based on intuition. • Intuition is the human ability to sense or know immediately without reasoning.

  4. Objective: Understand and Identify different methods for controlling systems • How do you know when to stop pouring milk? Judgmental You want enough to drink but you don’t want to over pour and make a mess.

  5. Analytical or Judgmental? • Could this group of people fit into this boat? • Would they be over the legal limit? Analytical Just count the people and compare to the legal limit.

  6. Analytical or Judgmental? • Is this suitcase too heavy to take on the plane? Analytical Just weigh it and compare to the airline limit.

  7. Analytical or Judgmental? • How long should I wait before I eat again? Judgmental You often eat when you feel you are hungry.

  8. Analytical or Judgmental? • Is the fish a “keeper”? Analytical Fish must meet size or weight requirements. Just measure and compare.

  9. Robot Video • While watching the Paper Airplane Robot Video, think about… • What other tasks can be completed with the NXT Robots?

  10. System Model Desired Result Input Process Output Feedback

  11. System Model • Steering a bicycle uses our judgment. We turn left and right based on “intuition” and experience. Desired Result Input Process Output Feedback

  12. System Model Desired Result Input We want to make a right turn without falling over. The bike turns to the right. Right turn made. Lean and turn to the right. Process Output Did we turn enough? Is the turn completed? Feedback Adjusting “device” Turn and lean more/less

  13. Closed-Loop and Open-Loop Systems • An open-loop system has no feedback path, while a closed-loop system uses feedback. Closed-Loop System: AC Unit Compare desired temp to actual temp Desired Result Process Heat/cool air runs AC unit turns off Output Input Desired Temperature Thermometer senses the temperature Feedback

  14. Closed-Loop and Open-Loop Systems • An open-loop system has no way of monitoring or adjusting itself. Open-Loop System: AC Unit Desired Result Person compares desired temp to actual temp Person turns AC unit off Heat/cool air runs Processes Output Input Desired Temperature

  15. Robot Game Start Lift left leg Raise right arm Are lights on? NO Hop once YES Lower right arm and left leg Turn left 90 degrees NO Are you facing the blackboard? YES End

  16. Robot Game • Is the robot game a closed loop or an open loop? • How do you know your answer is correct?

  17. Is this a closed-loop or open-loop systems? Why? Open-Loop System: TV Remote Desired Result Data sends from remote to TV Person presses the channel button Input Channel changes Processes Output Person wants to change the channel

  18. Communication Systems • Communication systems can exist between different combinations of humans and machines. • Human to Human • Human to Machine • Machine to Human • Machine to Machine

  19. Communication Systems • Human to Human • A teacher explains how students should complete an assignment. • Human to Machine • A human sets an oven toa desired temperature.

  20. Communication Systems • Machine to Human • A microwave dings to tell a human when the foodis done. • Machine to Machine • An iPod syncs with a computer to add new music.

  21. Closing • Fill in the chart based on the information you gained on communication systems. • Use examples from your experience with the NXT robots. Communicated with groups about programming Wrote programming for NXT NXT made sound telling us it completed its task NXT and computer exchanged information

  22. Provide the appropriate communication system for the following examples. (i.e. human to human, machine to human, etc.) • A person puts a DVD in the DVD player. • The DVD player reads the DVD. Human to Machine Machine to Machine

  23. Technology Systems • A product, system, or environment developed for one setting may be applied to another setting. • Microwave technology was first developed as a way to communicate. • Now we use microwave technology to heat our food.

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