N-Channel MOSFET as a Switch. Turn ON a 12V Motor with Arduino. (Step-By-Step Guide)

This is a tutorial about using an N-Channel Enchantment Type MOSFET as a switch to turn ON and OFF a 12V Motor.

UPDATE:
You should also add a 100-ohm resistor between the Arduino pin and the Gate terminal of the MOSFET. The MOSFET has a small capacitance that starts to charge/discharge when you switch the Arduino pin. This creates a short current spike that can be bad for the Arduino pin. Especially if you plan to do high-frequency switching.

Full connection diagram: https://circuitjournal.com/img/diagrams/n_channel_mosfet_connections.jpg
I am using a 30N06L, but you can use some other logic level N-Channel Enchantment Type MOSFET.

Buy from AliExpress.com:
30N06L: http://s.click.aliexpress.com/e/DdgS25tQ
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