My goal was to build a controller for a train simulator (ZUSI) for as little money as possible. I paid less than 50 euros for all the components.

Features:
- 4x levers with potentiometer with 10 or more click stops
- 9x Push buttons
- 1x potentiometer for door selection
- 1x Arduino Leonardo for the controller

Dimensions
Width: approx. 25cm
Height: approx. 4cm (without the levers)
Depth: approx. 10cm

Levers:
The levers each have click stops. I used 10 click-stops for both levers on the right (brake) and a little more for the levers on the left (drive) so that you can adjust the lever more precisely.

4x rotary potentiometer 
Item no.: RK09K111-LIN10K
[https://www.reichelt.com/ch/de/shop/produkt/drehpotentiometer_mono_10_kohm_linear_6_mm-73808?currency=CHF](https://www.reichelt.com/ch/de/shop/produkt/drehpotentiometer_mono_10_kohm_linear_6_mm-73808?currency=CHF)

16x screws + nut
Thread length 18mm with diameter up to 3mm

Push-button:
9x article no.: T 113A SW
[https://www.reichelt.de/de/de/shop/produkt/miniatur-drucktaster_0_5a-24vac_1x_ein_sw-45167?nbc=1&trstct=pol_7](https://www.reichelt.de/de/de/shop/produkt/miniatur-drucktaster_0_5a-24vac_1x_ein_sw-45167?nbc=1&trstct=pol_7)

Door selector:
1x rotary potentiometer Article no.: PIH PC1606223A

[https://www.reichelt.de/de/de/shop/produkt/drehpotentiometer_22_kohm_linear_6_mm-232555?nbc=1&trstct=pol_11](https://www.reichelt.de/de/de/shop/produkt/drehpotentiometer_22_kohm_linear_6_mm-232555?nbc=1&trstct=pol_11)

Box:
4x heat set insert for 3mm hole
4x screw thread length 7mm