The PCB is compatible with Arduino and you have to solder the ATmega328p chip, the 16MHz resonator, some small resistors, the 5V regulator and the motor driver. Follow the schematic and solder all the needed components. We also need big resistor for the sense pin of the driver. The PCB also has a space for a buzzer and inputs for PWM or potentiometer analog read. On the PCB we also have a MOSFET and a fan connector in case that we want to contrtol a fan and cool the driver. You have links for the GERBERs of the PCB for free. But you could also get it from my shop and like that you support my work. Thank you.