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Title: Light-sensitive Alarm Project
Page Link: Light-sensitive Alarm Project -
Posted By: venkateswrar reddy
Created at: Thursday 05th of October 2017 04:00:40 AM
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The circuit detects a sudden shadow falling on the light - sensor and sounds the bleeper when this happens. The circuit will not respond to gradual changes in brightness to avoid false alarms. The bleeper sounds for only a short time to prevent the battery running flat. Normal lighting can be used, but the circuit will work best if a beam of light is arranged to fall on the light-sensor. Breaking this beam will then cause the bleeper to sound. The light sensor is an LDR (light-dependant resistor), this has a low resis ....etc

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Title: literature review for super sensitive industrial security system using auto dailer a
Page Link: literature review for super sensitive industrial security system using auto dailer a -
Posted By: jaygunner
Created at: Thursday 05th of October 2017 04:48:12 AM
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Title: INTRUDER ALARM SYSTEM
Page Link: INTRUDER ALARM SYSTEM -
Posted By: asha
Created at: Friday 06th of October 2017 03:08:13 PM
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Title: light sensitive alarm project using 555 timer project report
Page Link: light sensitive alarm project using 555 timer project report -
Posted By: Avinash
Created at: Thursday 17th of August 2017 04:32:21 AM
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Title: laser based intruder alarm project report pdf
Page Link: laser based intruder alarm project report pdf -
Posted By: cuteanki
Created at: Thursday 05th of October 2017 04:08:05 AM
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Title: mini project on light sensitive alarm with timer 555 in details report
Page Link: mini project on light sensitive alarm with timer 555 in details report -
Posted By: sreedhar
Created at: Thursday 17th of August 2017 06:42:18 AM
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Title: pir based intruder alarm using 8051 c language
Page Link: pir based intruder alarm using 8051 c language -
Posted By: ilara
Created at: Friday 06th of October 2017 02:55:29 PM
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pir based intruder alarm using 8051 c language

Interfacing PIR sensor to 8051 microcontroller.
PIR sensors are widely used in motion detecting devices. This article is about interfacing a PIR sensor to 8051 microcontroller. A practical intruder alarm system using PIR sensor and 8051 microcontroller is also included at the end of this article. Before going in to the core of the article, let s have a look at the PIR sensor and its working.

PIR sensor.

PIR sensor is the abbreviation of Passive Infrared Sensor. It measures the amount of infrare ....etc

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Title: TOUCH SENSITIVE ALARM
Page Link: TOUCH SENSITIVE ALARM -
Posted By: electronix
Created at: Thursday 17th of August 2017 06:49:36 AM
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TOUCH SENSITIVE ALARM


How it works
Heart of the circuit is a single 40106 hex Schmitt trigger
inverter IC, together with a piezoelectric alarm unit and a
handful of other components. The first Schmitt Inverter
(IC1a) together with its associated 10kW-feedback resistor
and 22pF capacitor forms a simple oscillator with a nominal
frequency around, 1MHz. The oscillator output passes via
a 15pF capacitor to a second Schmitt inverter, IC 1 b,
which in turn is AC-coupled to a full ....etc

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Title: advantage of super sensitive intruder alarm
Page Link: advantage of super sensitive intruder alarm -
Posted By: rahullalh
Created at: Thursday 17th of August 2017 08:28:47 AM
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advantage of super sensitive intruder alarm

Super Sensitive Intruder Alarm Circuit Principle:

IR transmitter always emits the IR (Infrared) rays which have to be received by IR receiver. When there is an obstacle in front of IR sensor, the transmitted IR rays are reflected back to the IR receiver. The output of Op-Amp is high when IR receiver receives the reflected IR rays. This output of operational amplifier is connected to the RESET pin of 555 timer.
IR transmitter always emits the IR (Infrared) rays to which have been to be received by IR ....etc

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Title: Light sensitive Alarm
Page Link: Light sensitive Alarm -
Posted By: varsha
Created at: Thursday 05th of October 2017 05:05:30 AM
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The circuit detects a sudden shadow falling on the light-sensor and sounds the bleeper when this happens. The circuit will not respond to gradual changes in brightness to avoid false alarms. The bleeper sounds for only a short time to prevent the battery running flat. Normal lighting can be used, but the circuit will work best if a beam of light is arranged to fall on the light-sensor. Breaking this beam will then cause the bleeper to sound. The light sensor is an LDR (light-dependant resistor), this has a low resistance in bright light and a h ....etc

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