You will need the following components for the assembly: Nano terminal board: https://www.ebay.de/itm/283712174549 Water pump: https://smile.amazon.de/dp/B07GBYPSZK (Air)hose 4 X 7 mm: https://smile.amazon.de/dp/B07R16GQDW Telephone cable 4-wire: https://smile.amazon.de/gp/product/B005G8CP5E DC plug/socket: https://smile.amazon.de/dp/B085BGK77N Arduino Nano: https://www.ebay.de/sch/i.html?_nkw=arduino+nano Ultrasonic sensor: https://www.ebay.de/sch/i.html?_nkw=hc-sr04&_sacat=0