I am sorry for my bad English.
I'm putting an automatic wire cutter. And the code I tested on the Un is working smoothly. But for arduin nano, the program repeats itself indefinitely. You do not know what a problem might be.
I2c lcd converter
A4988 stepper driver
futaba 3003 servo
geekcreit arduino nano
I did more to solve the non-soldering fields. Because I thought there might be a problem in contacts, but the problem still persists. Below I'm adding the source code.
thank you in advance for the answers