how i can design blind Disobeyed that can the blind move without Collide the wall that the distance will be 1m just and then if the blind man Approaching more from the wall then an buzzer will Sounders
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Abstract

In foam extrusion, material density is the most significant factor affecting the product cost and therefore the profitability of the manufacturing process. A reduction in the density of extruded parts reduces the raw material cost and therefore increases its profitability. On the other hand, a reduction in foam density degrades the mechanical properties and geometrical accuracy of extruded parts. Therefore, a critical balance has always to be achieved in order to minimize the material cost while maintaining adequate strength and acc ....etc

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help me for ULTRASONIC MOTION DETECTOR. ....etc

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Abstract:
Ultrasound Identification is a Real Time Locating System (RTLS) is used to automatically track and identify the location of objects using simple inexpensive nodes (badges/tags) attached to or embedded in objects and devices which then transmit an ultrasound signal to communicate their location to microphone sensors.Ultrasound-based IPS is considered a better alternative to passive Radio-frequency identification (pRFID) in complex indoor environments (such as hospitals), where radio waves may reflect off of metallic or ceramic object ....etc

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Ultrasonic motion detectors emit and receive ultrasonic sound energy in a region of interest.Object motion within the region of interest and in the range of the ultrasonic motion sensor is detected and an alarm signal is produced.The range of these detectors differs from the designed range whenever the actual atmospheric sound propogation conditions vary from the atmospheric conditions assumed in the design .Ultrasonic motion detectors are commonly used for automatic door openers and security alarms. ultrasonic beams are easily blocked by t ....etc

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i want ppt on ultrasonic motion detector and components used in it.
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pliz assist me to get the micontroller based ultrasonic motion detector circuit diagram for my final year project. ....etc

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Introduction
A motion detector is an electronic device that detects the physical movement in a given area and transforms motion into an electric signal. The motion detector may be electrically connected to devices such as security, lighting, audio alarms, and the like. Motion sensors are used in a wide variety of applications and as a result many different types of motion sensors are available. Motion detectors are mainly used in for security systems. For example, motion detectors are typically positioned near exter ....etc

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pliz assist me to get the micontroller based ultrasonic motion detector circuit diagram.i need it urgently for my final project
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The ultrasonic detector 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 above 20KHz but me cannot hear them, these very high sounds are called ultrasounds or ultrasonics. Imagin ....etc

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