Project 9 - problems with motor

Official Hardware Kits Starter Kit
1

I'm trying to make project 9.

When I press the switch the motor starts.
When I unpress it, the motors continues running decreasing its speed really slowly. Even if I stop the motor (with a finger), it will start again.
If I unplug the battery the motor stops directly.

So, it seas that the mosfet, when I send LOW to gate, the connectivity between the drain and the soruce, instead of stopping, is decreasing gradually.

Any thoughts on what may be happening?

Thanks.

2

Hi mateuyabar

What type of MOSFET are you using? What is its part number?

Regards

Ray

3

I bought the Arduino Kit,
The mosfet is: IRF520 http://arduino.cc/documents/datasheets/MOS-irf520npbf.pdf

4

Hi, I am having the exact same problem, mateuyabar. Did you ever get this to work right, or at least figure out why it is doing what it is doing?