ultrasonic sensor interfacing with lpc2148
#1

I want the code for interfacing ultrasonic sensor with lpc2148
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#2

An ultrasonic sensor is a device that can measure the distance to an object using sound waves. Measure the distance by sending a sound wave to a specific frequency and listening for the sound wave to bounce. By recording the time elapsed between the sound wave generated and the sound wave bouncing backwards, it is possible to calculate the distance between the sonar sensor and the object.


Ultrasonic sensors are based on measuring the properties of sound waves with a frequency higher than the human audible range. They are based on three physical principles: flight time, Doppler effect and attenuation of sound waves. Ultrasonic sensors are not intrusive because they do not require physical contact with their target and can detect certain clear or bright targets, otherwise obscured by some vision-based sensors. On the other hand, its measurements are very sensitive to the temperature and the angle of the target.

Ultrasonic sensors "rely on measuring the properties of acoustic waves with frequencies above the human audible range," often at about 40 kHz 1). They usually operate by generating a high frequency pulse of sound, and then receiving and evaluating the properties of the echo pulse.
Three different properties of the received echo pulse can be evaluated, for different detection purposes. They are:
 Flight time (for detection distance)
 Doppler shift (to detect speed)
 Amplitude attenuation (to measure distance, directionality or attenuation     coefficient)
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