Documentation work by Ajay D Kandavalli
As our society becomes more and more modernized so does our need for more sophisticated ways to i... more As our society becomes more and more modernized so does our need for more sophisticated ways to identify people for who they really are. Biometrics is the science of human recognition. In biometrics," IRIS AND RETINAL SCANNING" technologies are known as "ocular-based" identification technologies, meaning they rely on unique physiological characteristics of the eye to identify an individual.
The main objective of developing this Ultrasonic Range Finder Using Micro controller is to provid... more The main objective of developing this Ultrasonic Range Finder Using Micro controller is to provide the information about destination whether is available or not when it is middle of transmission. The previous system was worked with radar based system but we could not find the effective results while using it in water based systems. The main advantage of this micro controller system we can find the targeted file while it is water. And this microcontroller finds the destination and sends the proper signals to that.
The time from transmission of the pulse to reception of the echo is the time taken for the sound energy to travel through the air to the object and back again. Since the speed of sound is constant through air measuring the echo reflection time lets you calculate the distance to the object using the formula D = (s * t)/2 (in meters).
You can get ultrasonic transducers optimized for 25 kHz, 32 kHz, 40 kHz or wide bandwidth transducers. This project uses a 40 kHz transducer but it will still work with the others if you make simple changes to the software. The receiver and generator circuits will work as they are. The 40kz signal is easily generated by the microcontroller but detection requires a sensitive amplifier. We can use a three transistor amplifier for the receiver. This is followed by a peak detector and comparator which set the sensitivity threshold so that false reflections are ignored.
In the development of this project I with my team have implemented our knowledge that we have learned from the subjects like Electronic Circuit Design,Micro Controller interfacing,communications,Programming and Embedded system Design in our Undergraduation.
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Documentation work by Ajay D Kandavalli
The time from transmission of the pulse to reception of the echo is the time taken for the sound energy to travel through the air to the object and back again. Since the speed of sound is constant through air measuring the echo reflection time lets you calculate the distance to the object using the formula D = (s * t)/2 (in meters).
You can get ultrasonic transducers optimized for 25 kHz, 32 kHz, 40 kHz or wide bandwidth transducers. This project uses a 40 kHz transducer but it will still work with the others if you make simple changes to the software. The receiver and generator circuits will work as they are. The 40kz signal is easily generated by the microcontroller but detection requires a sensitive amplifier. We can use a three transistor amplifier for the receiver. This is followed by a peak detector and comparator which set the sensitivity threshold so that false reflections are ignored.
In the development of this project I with my team have implemented our knowledge that we have learned from the subjects like Electronic Circuit Design,Micro Controller interfacing,communications,Programming and Embedded system Design in our Undergraduation.