Complete the circuit below to show how the control of the motor can be achieved.
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| SYSTEMS PREPARATION QUESTIONS 2008 - 6 |
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| 7. The student has decided to use a PIC microcontroller to
control the motor that raises and lowers the barrier. The student uses
outputs 1 and 2 to control the motor. Output 1 will turn the motor on and
off. Output 2 changes the direction of the motor. Complete the circuit below to show how the control of the motor can be achieved. |
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| ANSWER |
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| 8. The student decides to use one of the inputs to detect when the barrier has completely opened. |
| Name a suitable sensor: |
| ANSWER |
| Name a suitable sensor: Microswitch |
| 9. Explain how the sensor would be used. |
| ANSWER |
| The microswitch will be positioned so that when the barrier is fully raised it is pressed. The micrositch will be connected to an input of the microcontroller circuit. The microcontoller will detect when the microswitch is pressed and keep the barrier raised until a train is detected. |
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