Arduino Based Ultrasonic Measurement System.
Posted: 21 Nov 2018
Date Written: October 29, 2018
Abstract
This paper describes an ultrasonic sensor that is able to measure the distance from the ground of selected points of a motor vehicle. The sensor is based on the measurement of the time of flight of ultrasonic pulses that are reflected by the ground. A constrained optimization technique is employed to obtain reflected pulses that are easily detectable by the means of a threshold comparator. Such a technique which takes the frequency response of the ultrasonic transducers into account, allows a sub-wavelength detection to be obtained. Experimental tests, performed with a 40khz piezoelectric-transducer based sensor, showed a standard uncertainty of 1 mm at rest or at low speeds, the sensor works at speed up to 30 m/s , although at higher uncertainty, The sensor is composed of only low cost components, thus being apt for the first car equipment in many cases, and is able to self-adapt to different conditions in order to give the best results.
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