a project integrates hardware and microcontroller programming into a security sy
ID: 3876241 • Letter: A
Question
a project integrates hardware and microcontroller programming into a security
system for a room
Requirements:
1. System Inputs may be two individual mutually exclusive inputs or a single dual-function
arm/disarm input that combines both
1.1. Arm
1.2. Dis-arm
2. Alarms/sensors (simulated by switch contact closure(s))
2.1. Any window open (window intrusion)
2.2. Entry door open (entry door)
2.3. Stockroom door open (stockroom door)
2.4. Smoke detected (smoke alarm)
2.5. Carbon monoxide (CO) detected (CO alarm)
3. Outputs
3.1. Visible red LED per alarm condition (labeled)
Explanation / Answer
1. Arm : Arm9 is a processor.
1.tap the security status bar or tap security
2. on the security screen ARM away mode is already selected, to activate another mode to arm stay
3. enter your keypad code,the exit delay begin
1.1 dis arm
1. tap the security status bar or tap security
2, enter your keypad code, system is disarmed.
2 Alarm/Sensor
Alarm sensor is used using PIR sensor. we use IC UM3561. it is a circuit which tkes digital input and generate digital output in form of light.
2.1 Any window open
For Window intrusion Piezoelectric element is used in circuit which is sticked to window and if anyone try to open it the Piezoeelectric elecric element in the circuit vibratesand produce voltage.
2.2 Entry door open or 2.3 stockroom door open :
it is used the PIR sensor which detects the human body then sensor produces the output pulses.microcontroller are pulses to manage the motor driver.
2.4 smoke detected
there are two types of detector : 1. optical smoke detector: it consist of a light source and alight detector like photocell. as long as light falls on it ehen there is smoke the light from source is interrupted and the photocell doesn't conduct
2. loniztion detector : it consist of two electrodes and ionization chamber filled with ions.when there is smoke the ions dont move freely and there is an alarm.
2.5 carbon monoxide we can use MCS51 based carbon monoxide alarm it is designed on T89C51AC2 microcontroller that perform aquisation.
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