The distance sensor VL53L0X is placed in the bottom of a box. The sensor can measure distances of up to 2m with 1 mm resolution.
Place the microcomputer Arduino Nano and 6-axis motion sensor MPU6050 in the box, the power supply was used a 9V battery.
MPU6050 is used to measure x-axis and y-axis of acceleration for detect the horizontal direction. The LED (Neopixel) is green , when measure is horizontal. When non-horizontal is light red.