A Security system has three door sensors A,B and C and an emergency bell E. The bell should be sounded according to the following sensor conditions A=ON and B=OFF and C=ON A=OFF and B=ON and C=ON A=OFF and B=ON and C=OFF A=B=C=OFF a) Draw a block diagram. b) Identifying all inputs and outputs. c) Make a truth table for the system d) Draw the circuit diagram for the system
Question
A Security system has three door sensors A,B and C and an emergency bell E. The bell should be sounded according to the following sensor conditions A=ON and B=OFF and C=ON A=OFF and B=ON and C=ON A=OFF and B=ON and C=OFF A=B=C=OFF a) Draw a block diagram. b) Identifying all inputs and outputs. c) Make a truth table for the system d) Draw the circuit diagram for the system
Solution
a) Block Diagram:
The block diagram would consist of three input blocks representing the sensors A, B, and C. These blocks would be connected to a logic circuit block which represents the conditions mentioned. The output of this logic circuit block would be connected to the emergency bell E.
b) Identifying all inputs and outputs:
Inputs: Sensor A, Sensor B, Sensor C Outputs: Emergency Bell E
c) Truth Table:
The truth table for the system would look like this:
| A | B | C | E |
|---|---|---|---|
| 1 | 0 | 1 | 1 |
| 0 | 1 | 1 | 1 |
| 0 | 1 | 0 | 1 |
| 0 | 0 | 0 | 1 |
| 1 | 1 | 1 | 0 |
| 1 | 1 | 0 | 0 |
| 1 | 0 | 0 | 0 |
| 0 | 0 | 1 | 0 |
Here, 1 represents ON and 0 represents OFF.
d) Circuit Diagram:
The circuit diagram would consist of three inputs A, B, and C connected to a logic gate circuit. The output of this circuit would be connected to the emergency bell E. The logic gate circuit would be designed based on the conditions mentioned. For example, for the condition A=ON and B=OFF and C=ON, the circuit would have an AND gate with inputs A and C, and a NOT gate for B. These would then be connected to an OR gate to sound the bell if any of the conditions are met.
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