2b. Design of an alarm system. (8 marks) A household has an alarm system to detect movement in their garden and windows

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2b Design Of An Alarm System 8 Marks A Household Has An Alarm System To Detect Movement In Their Garden And Windows 1 (286.95 KiB) Viewed 37 times

2b Design Of An Alarm System 8 Marks A Household Has An Alarm System To Detect Movement In Their Garden And Windows 2 (44.33 KiB) Viewed 37 times

2b. Design of an alarm system. (8 marks) A household has an alarm system to detect movement in their garden and windows opening during the night. A visual alarm (red light) is turned on if there is movement in the garden or any of the windows is opened. A sound alarm (siren) goes off (makes noise) if there is movement in the garden and any of the windows is opened. A light sensor is used to detect if it is night or day time. To design this system using logic gates the following inputs and outputs were identified: A= Open window sensor. 1= open; 0= closed. B= Movement sensor. 1= movement; 0= no movement. C= Light sensor. 1= night time: 0= day time. X= Light. 1= on; O= off. Y=Siren. 1= on (makes noise); O=off (silent). The following truth table describes the behaviour of the alarm system as a logic system: Inputs Outputs Light Siren C B А 0 0 0 0 0 0 1 0 1 | A |0|1|0|1|0|1|0|1 | 0|000 | 0|0|0 | 0|0|0|0|1 1 0 1 0 1 1 1 1 1 1 1 Behavioral AND gate Create a schematic diagram in LTspice to implement the truth table. To add logic gates to your schematic diagram, type the name of the gate you want in the search box of the 'add component dialog (see A1 Figure). Type “and”, “or”, "mor" and "inv" to find the gates needed in this exercise. In past versions of LTspice there were different symbols for gates with different number of <Value> inputs. In the latest version, there is only one symbol for each of the gates, regardless of the number of inputs. Use as many inputs as needed and let the remaining inputs [Comparators] unconnected. Unused inputs are ignored by the simulator. 中中中中 Open this macromodel's test fixture Q and Symbol Description [ADC) [DAC) [Digital] and <directory with 10 entries> <directory with 42 entries> <directory with 1 entries> <directory with 16 entries> Behavioral AND gate 6
Create one schematic diagram in LTspice to simulate the alarm system. Follow the instructions given in the video "Simulation of digital circuits in LTspice” to generate the inputs. Run your simulation for 0.1 seconds. All 8 input combinations should be clearly visible. (4 marks) Verify the functionality of your alarm system by simulation. (4 marks)