Quantity   Component name
1 × 16x2 Character LCD (16pin interface)
1 × Arduino Needs to drive the Character LCD, controll a FET and needs to have three inputs left.
1 × Logic Level MosFet Directly connected to the Arduino, with internal Pull-Up
3 × Push Button Closing
1 × T7805 Voltage regulator 12V->5V
2 × Condensator 100nF Voltage stabilization for the T7805