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DIGITAL LOGIC EXAM QUESTION 1 | |
V. Ryan © 2003 - 2009 | |
PDF FILE - CLICK HERE FOR PRINTABLE EXERCISE BASED ON WORK BELOW |
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An electronics company has developed a baby sitting
device which warns parents when their child turns on a lamp next to the
bed or when the temperature of the room falls. |
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1. What is a
transducer driver and what is its function? |
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2. The young child awakes and turns on a lamp next to her bed, changing the logic states of the outputs / inputs of the sensors and logic gates. On the logic circuit below, write the logic state of inputs / outputs of the sensors and gates. |
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3. As the child grows older she regularly gets out of bed and moves around during the night. A new sensor needs to be connected to the system to detect this movement. A micro-switch (SENSOR C) has been added to the system so that when the child opens her bedroom door the buzzer is activated. Complete the circuit below by adding the necessary gate. |
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4. In the space opposite write/draw the logic table for your chosen gate. |
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5. The electronics company has
decided to add a circuit that will pulse the buzzer on and off. Name a
circuit that could be used. An ASTABLE 555 timer circuit. |
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