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Introduction  I have wanted to build an ultrasonic object detector ever since I saw a post on one. I have seen several projects on ultrasonic object detectors. However, all of the projects tethered the sensor to a PC. I wanted a more portable solution. So I designed an ultrasonic object detector that the user could place anywhere that had Wi-Fi connectivity. The ultrasonic object detector sends the sonar data to the PC via Wi-Fi. The PC then displays the data using a simulated sonar screen ...