2. For this problem you will complete the design of the home security system sho

Question

2. For this problem you will complete the design of the home security system shown below. The operation of the system is as follows: INPUTS .A-The variable A will be used to indicate that a person has been detected in the home o A = 1 means a possible intruder is present o A-0 means no one is present B-The variable B will be used to indicate that a correct code has been entered o B 1 means a correct code has been entered o B-0 indicates no code or incorect code entered OUTPUTS Green LED-The green LED will be lit when the home is secure . Amber LED-The amber LED will light when a possible intruder has been detected .Red LED-If a correct code has not been entered 10 seconds after a possible intruder has flash been detected, the red LED will begin to Alarm-Ifa correct code has not been entered 30 seconds after a possible intruder has been detected, the alarm will sound. Home Security System Green Amber Red Alarm

Explanation / Answer

a) When A=1 and B=1 or A=0 and B=1 the OR gate output is 1 therefore the Green Light will turn on

b) When A=1 and B=0 or 1 and the output of counter U2 will also be C(0)= 0 NOR gate output is 1 then AND gate output is 1 therefore the Amber Light will turn on

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