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ultrasonic motion detector schematic


Posted by: seminar presentation
Created at: Saturday 29th of May 2010 06:38:04 AM
Last Edited Or Replied at :Saturday 29th of May 2010 06:38:04 AM
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ed type as it is not affected by temperature chances.The human ear can hear sounds of frequencies between 20Hz and 20KHz (20,000Hz). Sound waves do exist above 20KHz but me cannot hear them, these very high sounds are called ultrasounds or ultrasonics. Imagine you are standing in a street and a police car or some other emergency service vehicle is speeding towards you. As it passes the sound of the siren seems to change. The reason tor this is because sound waves travel at a finite speed (700mph approx) regardless of the speed of the sound source. In effect as the source moves towards you the ..................[:=> Show Contents <=:]



noise alarm mini project with circuit diagram


Posted by:
Created at: Tuesday 28th of February 2012 09:30:05 AM
Last Edited Or Replied at :Tuesday 28th of February 2012 09:30:05 AM
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I'am a second year engineering student I want circuit diagram wit..................[:=> Show Contents <=:]



The ultrasound motion detection sensor


Posted by: seminar class
Created at: Tuesday 12th of April 2011 12:12:10 AM
Last Edited Or Replied at :Tuesday 12th of April 2011 12:12:10 AM
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ed to a preselected audible alarm or lighting device which is then activated. A number of different technologies are used for motion detection. Motion detectors typically employ ultrasound, passive infrared (PIR), or radar detection techniques. Among the most used and most effective type of intrusion detection devices are the passive IR detectors which in recent years have replaced other types such as microwave or ultrasonic detectors.
TYPES OF SENSORS
Microwave sensors

Microwave sensors are used in large apartments since microwaves can penetrate through dielectric mediums. But they ..................[:=> Show Contents <=:]



PIR SENSOR BASED MOTION DETECTION SYSTEM FOR SECURITY


Posted by: sarathpradeep
Created at: Sunday 23rd of January 2011 06:48:16 AM
Last Edited Or Replied at :Tuesday 01st of February 2011 07:06:22 AM
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Hi i am Sarath pradeep, 3rd yr ECE student. I need the full detail including diagrams and programs abt the topic PIR SENS..................[:=> Show Contents <=:]



ultrasonic motion detector schematic


Posted by: seminar presentation
Created at: Saturday 29th of May 2010 06:38:04 AM
Last Edited Or Replied at :Saturday 29th of May 2010 06:38:04 AM
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eams are easily blocked by thin materials, including paper and as a result False triggering is easly caused by reflections from blowing curtains, pets, and flying insects.

its is a popular device for detecting motion in a free space. it is not as versatile as the passive infra-red type mainly due to its restricted range, usually only about 9 meters max. It can be used in situations and environments which mould be unsuitable for the infra-red type as it is not affected by temperature chances.The human ear can hear sounds of frequencies between 20Hz and 20KHz (20,000Hz). Sound waves do exist ..................[:=> Show Contents <=:]



Simple Sound Activated Burglar Alarm System


Posted by: Sidewinder
Created at: Saturday 15th of May 2010 10:47:40 PM
Last Edited Or Replied at :Tuesday 12th of October 2010 04:39:07 AM
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plifier. It had a gain of 200. The amplifier then passes it on to the latch section of the burglar alarm circuit for further processing. The CD4013B dual D-type flip-flop is a
monolithic complementary MOS (CMOS) integrated circuit. It has the inputs D, Q,QBAR The logic level present at the ?D? input is transferred to the output during the positive-going transition of the clock pulse. Setting or resetting is independent of the clock. Once a sound that exceeds certain intensity, it is picked by the microphone, amplified
and sent to the latch, the latch keeps the alarm still ringing until the r..................[:=> Show Contents <=:]



Ultrasonic Motion Detector


Posted by: computer science technology
Created at: Thursday 28th of January 2010 08:06:38 PM
Last Edited Or Replied at :Thursday 28th of January 2010 08:06:38 PM
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larm loop will be closed. If however the detector senses movement then it will open this relay for approximately 5 seconds after which it will reset itself.
2. A Tamper Switch Output. This is closed until the cover is removed..................[:=> Show Contents <=:]



ULTRASONIC MOVEMENT DETECTOR


Posted by: kesavaram447
Created at: Thursday 24th of December 2009 06:44:07 AM
Last Edited Or Replied at :Saturday 23rd of April 2011 02:07:24 AM
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