Diagrams and Code at: https://www.elithecomputerguy.com/2019/06/hc-sr04-ultrasonic-distance-sensor-audio-alert-with-arduino/
With an HC-SR04 and a Piezo Buzzer you can create an audio distance sensor like the one many cars have for backing up.
Functional Parts in the Project:
Arduino Uno – https://store.arduino.cc/usa/arduino-uno-rev3
HC-SR204 Ultrasonic Sensor – https://amzn.to/31AGgYC
Micro Breadboard – https://amzn.to/2XbFX7w
Piezo Buzzer – https://amzn.to/2F961py
...
https://www.youtube.com/watch?v=PWCAMvCIliA
Code and diagrams can be found at: https://www.elithecomputerguy.com
OLED Screens are great ways to display text from your Arduino Projects. You can change Font Sizes, positions and much more.
Libraries Required for this Demonstration:
Adafruit SSD1306
Adafruit GFX
Note: Remember to change the I2C address within the example sketch.
...
https://www.youtube.com/watch?v=HdgugXvqR3I