... do you have experience with measuring electonics?
You don't have to measure inline the motor wires - and be carefully, don't disconnect/connect the motor with power on, this will wreck the driver!
The essential pins are the DIR and CLOCK pins of the driver, which are controlled by the Arduino - the CLOCK pin is the stepping frequency, this can only be seen/measured correct with an oszilloscope, as it's a pulsing signal with some kHz, so not measurable with a voltmeter.
The DIR pin is easier to measure, as it will change polarity when changing the moving direction of the respective motor in the software.
This voltage value should change between 0V in one direction and something between 3V and 5V in the other ...
You don't have to measure inline the motor wires - and be carefully, don't disconnect/connect the motor with power on, this will wreck the driver!
The essential pins are the DIR and CLOCK pins of the driver, which are controlled by the Arduino - the CLOCK pin is the stepping frequency, this can only be seen/measured correct with an oszilloscope, as it's a pulsing signal with some kHz, so not measurable with a voltmeter.
The DIR pin is easier to measure, as it will change polarity when changing the moving direction of the respective motor in the software.
This voltage value should change between 0V in one direction and something between 3V and 5V in the other ...