ok.. this is the problem. i have a line following robot. controlled by arduino.
i want to change the smaller 3v dc motor to a bigger 6v dc motor by some kind of a reason., since the robot only produce 3v to power the small dc motor. i want to hook the 6v motor to another 6v power source by using transistor as the 3v will switch the 6v dc motor.
the problem is. the robot can reverse the dc motor whenever its out of track with the line. reverse the +/- vice versa so that the motor can turn forward and reverse.
how can i apply the transistor switch if that is the case?
if there is a solution, pls give me the diagram.