Question #176160

A chemical process is controlled by a logic circuit. The circuit uses three sensors A, B and C, which

switch an alarm, Q = 1, when certain conditions are reached.

Flow rate â‰¥ 5 litre/second 1

Flow rate < 5 litre/second 0

Temperature â‰¥ 30 o C 1

Temperature < 30 o C 0

Pressure â‰¥ 1 atmosphere 1

Pressure < 1 atmosphere 0

(i) Construct a schematic diagram and simulate the operation of the logic circuit using standard logic gates.

(ii) Minimise the logic circuit using a Karnaugh Map, and then construct a schematic diagram, and simulate the operation of the minimised logic circuit, using standard logic gates.

(iii) Use De Morganâ€™s Theorems to convert the minimized circuit to use only NAND gates.

(iv) Build a prototype of your final circuit and verify that it meets the conditions in the truth table, and then compare the results from theory, simulation and measurement.

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