I have made a small model of the ultrasonic sensor!!!
It was so amazing when I done it.
On the left side, it is an Ultrasonic sensor. It is a distance sensor.
On the right side, it is an Arduino circuit board. It needs to load a code to the Arduino software on the computer and set how far you want the ultrasonic sensor to sense.
For example, I set the distance to 10cm. When my hand is away from 10 cm, then the light will turn green. When my hand is within 10cm, the light will turn red.
My idea is to put the sensor on the top of the stalls and set a distance. When people go in, the sensor will sense the distance and it will turn red.
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