To make the electronics part, I’ve used these connections below. The DC motor connected to the H bridge driver and the driver is connected to 4V from the battery and signal from the Arduino Pro mini. I know an Arduino is overkill for this project, but I want to add more features in the future and we also use the OLED screen to print the rotating time. I solder 3 push buttons to a prototyping PCB. I connect the Arduino to the driver and the battery and so on. With thin wires I connect the buttons to the Arduino and the OLED display as well.