Question

A security system for a building has three ways of detecting an intruder.

1. Security camera (SC) which sends a 1 when an intruder is detected.

2. Motion sensor (MS) which sends a 0 when an intruder is detected.

3. Noise level detector (NLD) which sends a 1 when the noise level rises beyond a certain threshold.

The system should work such that the alarm should sound when

• SC doesn’t detect an intruder but the MS and the NLD do

• Neither SC nor the MS detects but the NLD does

• SC and the MS detect but NLD doesn’t

• SC detects only

• SC and NLD detect but MS doesn’t

However, it has been observed, that when the NLD is off, the system does not sound an alarm even if the SC and MS detect an intruder.

Analyze the circuit for the problem and fix it.

For the above circuit

1. Construct a Truth table of the current system and analyze, the issue.

2. Construct a Truth Table for the modified (fixed) system.

Answer 1

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Ans Sc MS NLD outkut 1) o o O 0 O 1 0 0 0 0 0 1 1 - 0 0 a (Accesseding to problem 0 1 1 1 2) Aften correction SC MS NLD output 0 0 1 0 0 O 0 1 0 1 fired . 6 0 1 1