The VL6180X distance sensor measures the disatance from an obstacle and shows the output on OLED display, via Arduino Pro Mini/Micro (5V, 16MHz).

The Arduino operates at 5V, 16 MHz and Vl6180X at 2.8V (but a voltage regulator allows 5V input to the breakout board), and the OLED at 3.3V (can  be given a 5V input).