I bought 2 SD02B. after correctly connect the arduino to the first driver, i first press the TEST button, and i can see the LEDs blinking. the same happened to second driver.
i uploaded the sample program given to arduino and attached the first driver. then the LEDs of the driver blinked, and the motor moved. but when i change to the second driver, the motor motor wont move, and the LEDs didnt blink. so i thought the driver is somehow broken. so i press the button TEST to makes sure. but the LEDs were blinking when and the motor moved.
whats the problem? i thought if it is broken, the test button shouldnt work.