I bought these "motor speed controllers" from Ebay recently with the intention of controlling the speed and direction of a DC motor:
However when I hooked it up to my microcontroller and tried running the PWM code, it did not work. When I played around with the included switch, it seems like the board can make the motor drive from speed 0 to max speed, but not change direction, like controlling a fan!
Is it possible to use the linked circuit board to control directionality of the motor? I got confused with the terms "motor controller", "speed controller", etc, and fear that I may have just bought a dozen of these that I can't use because I need bidirectional control.