Arduino Project: Ultrasonic Sensor with Buzzer and 9 LEDs
CODE + SCHEMATIC LINK: [ Ссылка ]

This project is similar to car's parking sensor system.

You will need an Ultrasonic (Distance) Sensor, a bunch of LEDs, a buzzer and 220
Ohm resistors.
CODE + SCHEMATIC LINK: [ Ссылка ]

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