Use three HC-SR04 ultrasound sensors and two battery displays to show you how close the obstacles are and from which side.

Hi, this project is about a DIY Parking Radar Sensor, it’s very easy to make, it’s based around the HC SR-04 Ultrasound sensor, I’m using 3 of them: One for each side and one for the middle, then 2 mini battery displays, that are actually made to show you the stat of the battery, but here I’m using it to show the distance between the sensors and the obstacles, depending on which side, also it depends on the maximum distance that you can set, above that distance it’s considered enough space always, below that the displays will change depending on that distance and its direction.”

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