Question

You are asked to build a digital logic circuit for a security alarm system. The system has four Motion Sensors which indicate the presence of an intruder. Each individual motion sensor should be able to trigger an alarm. The system should be completely disabled via a Master Switch. In addition, the siren, the flashlight and the automated call to the security company should have separate enable switches. The inputs and outputs are specified as follows: Inputs: S1, S2, S3, S4 : Motion Sensors (0 = no intrusion detected, 1 = intrusion detected) M : Master Switch (0 = security system disabled, 1 = security system enabled) A : Audible Alarm Enable Switch (0 = audible alarm disabled, 1 = audible alarm enabled) L : Light Enable Switch (0 = flash light disabled, 1 = flash light enabled) P : Phone Call Enable Switch (0 = call disabled, 1 = call enabled)

Answer 1

Answer:

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Answer 2

The system has four Motion Sensors that indicate the presence of an intruder.

Each individual motion sensor should be able to trigger an alarm.

The system should be completely disabled via a Master Switch.

In addition, the siren, the flashlight and the automated call to the security company should have separate enable switches.

Explanation:

The inputs include:

         1. Motion Sensors                     S1 S1 S3 S4

         2. Master switch                        M

          3.Siren Enable Switch              A

          4.Light Enable Switch               L

         5.Phone Call Enable Switch      P

The Outputs are:

        Buzzing Siren                          B

        Flashing Light                          F

        Call Box                                    C

when ANY of the sensors goes active (1),

the output must be active,

so for the sensors inputs, we use an OR gate.

After that the OR signal output goes to the switches  AND gates, if any of the switches is off, the outputs are going to be LOW or (0)