Just bought this from aliexpress. Took me awhile to figure out how to get it running...tie the blue wire to ground. It works fine, however I would like to control its speed but there's no info avail on the net. If anyone here have experiences with these kind of boards or similar please help me out

 

The benefit of shopping with those on-line places is that they never provide any useful information to make you think. there might be some labels on the terminals but they are out of focus and not readable.

 

Just bought this from aliexpress. Took me awhile to figure out how to get it running...tie the blue wire to ground. It works fine, however I would like to control its speed but there's no info avail on the net. If anyone here have experiences with these kind of boards or similar please help me outView attachment 336760View attachment 336761View attachment 336762View attachment 336763

The wire you're grounding is probably an enable so it might be possible to control the speed by feeding it a PWM signal. Or that may just confuse it.