smaller volt drives larger volt,transistor switch dc motor clock wise/ counter.

Using Arduino Motors, Mechanics, Power and CNC
1

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.

2

You are using an H-Bridge to control the 3V motor. Often the H-Bridge will work at a higher voltage without needing external transistors.

What circuit are you using to drive the 3V motor?

3

johnwasser:
You are using an H-Bridge to control the 3V motor. Often the H-Bridge will work at a higher voltage without needing external transistors.

What circuit are you using to drive the 3V motor?

i did not make the device.

the problem is how can i make an outer circuit using transistors. the 3v output of the device can triger the 6v dc motor and have the capability of reverse and forward.