Quantity   Component name
1 × Arduino Nano
1 × HC-SR04 Ultrasonic Rangefinder
4 × 220 ohm resistors
3 × LEDs; Red, Yellow, Green I thinK these were 12V 3mm
1 × 8 ohm Laptop speaker tried a few different ones, anything 8 ohm worked, but sound quality was diff
1 × Salvaged dial potentiometer (not necessary)
1 × Solderless breadboard regular 400 or something holes
1 × 10K potentiometer