I am completely new to the universe of hardware and I am trying to control 2 motors via my RPi 4.
But the 1st step is to find out which electrode is positive and which one is negative so when connecting to a stepper motor controller, I won't burn/damage it.
I have a toy car which I bought from Kmart and here is its manual.
I have opened its shell and try to figure out how to connect my RPi 4 to the 2 motors on this car.
After research, my understanding is I need to connect RPi 4 to a stepper motor controller first and then connect to the motors.
Here are the photos.
As you can see here, there are 2 motors, one is to control drive or stop, another is to control the turning. There is no manual to the 2 motors.
So here is my questions:
How can I tell which electrode is positive and which is negative on both motors?
What are the 3 things I marked in picture 2?