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POLICE SIREN SECURITY ALARM
GRACE JEAN D. FERNANDEZ
This is a security system which produces a wailing sound and alarms when there is an intruder or when there is someone interrupting the sensor.
DESCRIPTION
SIGNIFICANCE
SECURE PROPERTI
ES
SECURE HOUSES
ANTI- THEFT
FUNCTION DIAGRAMSWITCH LASER LDR
ASTABLE CIRCUIT is
OFF
ASTABLE CIRCUIT is
ON
BUZZER
CIRCUIT FLOW
Dark Detector Circuit
Astable Multivibrator Circuit
DARK DETECTOR CIRCUIT (1)
LDR is at MINIMUM VALUE
When it detects NO light
DARK DETECTOR CIRCUIT (2)
LDR is at MAXIMUM VALUE
When the LASER is directed
ASTABLE MULTIVIBRATOR CIRCUIT (STATE 1)
ON
OFF
470
47010K 10K
100uF
100uF
ASTABLE MULTIVIBRATOR CIRCUIT (STATE 2)
ON
OFF
470
470
10K 10K
100uF
100uF
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