Distance from an object is measured by Ultrasonic Sensor Module HC-SR04 View Datasheet, which is displayed in centimeters by I2C 1602 LCD Display. The distance is also visualized by LEDs which light up depending on the distance.
See Circuit Diagram: /funky_gogo_lappi/circuit_diagram.pdf
See Circuit Design: /funky_gogo_lappi/circuit_design.png
Elements used: /funky_gogo_lappi/elements.png
Source code: /funky_gogo_lappi/funky_gogo_lappi.ino
Made with Arduino Uno.