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The authors propose a radar made with the ultrasonic sensor type HC - SR04, developed for Arduino. The novelty added by this paper is the development of specific libraries aiming to interface the sensor produced for Arduino with the microcontroller PIC 18F, manufactured by Microchip. We have taken into account the temperature influence on the ultrasound. The radar can detect objects located at distances between 2 cm and 4 meters and displays the value of distance to the object. The object detection is performed inside an angle of 180 degrees. The motion sensor that covers this angle uses a stepper motor. Data are presented on a LCD display, the motor movement being synchronized with the browsing of the radar screen. Synchronization is made by programming the timers of the microcontroller. These timers generate interruptions at preset moments, correlated with the completion of a specific area of the graphic display.
Paulet et al. (Sat,) studied this question.