(Prototype) electronic trombone with conductive filament

This is a prototype electronic trombone with conductive filament.
In the future I want to e-trombone. Currently, it is a variable resistor.

I made in order to test the conductive filament.
Tested conductive filament is a SainSmart made of ABS-conductive filament. It is 3750 yen in the Amazon.

0.2mm laminated, 40% infill, 235 degrees Celsius
About 500K-1.5MΩ

It is with the arduino program. Please be as circuit diagrams.
This is a resistor divider circuit.

PS.
Ba