I connected 2 motors (12 volt) to an arduino 328 atmega, i use the BD135 transitor and flybackdiode.
I use a external adapter for the motors because of the 300 mA for 1 motor. I connected the two the grounds: the minus from the adapter to the ground of the arduino (the + from the adapter goes directly too the motor)
I connected the transistor the right way as in the datasheet.
The problems is that the motors turning but when they have to stop, they continue. De arduino is uploaded the right way,
so there is no problem with the sketch,
What can be the problem??
thanx Jeroen