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What does the model show?

A programmable control system, which automatically puts house lights on when it is dark and when someone approaches is shown. This demonstrates the use of flowchart components including decision-making and the use of target inputs and outputs as part of a house context.


Figure 1

Demonstration Instructions

Circuit notes:

  • This circuit demonstrates how a context can be used to create a more realistic control sequence.
  • The 'Write: pins' symbol addresses all 8 output pins at once; in this flowchart it is used to switch them all off.
  1. Click on the 'Toggle whiteboard mode' button on the Yenka toolbar to go to full-screen mode. And use the sliders on the bottom and right of the screen to centre the circuit on screen.
  2. Click the green button on the 'Start' symbol to run the simulation.
  3. Click the pressure sensor to simulate someone approaching the house. This will switch all the lights on.
  4. Click it a second time and they will go out.
  5. Click the light sensor and drag the slider down to simulate it becoming dark.
  6. This will cause the house lights to come on. Take the slider back up to simulate it becoming light and they will go out.