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Hi, I want to use DC motor in my arduino and I learned that it is dangerous and might fry my board. I want to use an external battery supply, should I use FET? help me pls
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I don't think you connected the grounds, Dave.
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Tell us about your DC motor.
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dear YuridaE,
It is hard to help you without proper information.
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more details on the dc motor. You have a wide array of motor drivers to control your dc motor:

esc's using the servo library
http://www.ebay.com.au/itm/320A-Brushed-Brush-Speed-Controller-ESC-For-RC-Car-Truck-Buggy-Boat-1-8-1-10-1-8-/360501023580?pt=AU_Toys_Hobbies_Radio_Controlled_Vehicles&hash=item53ef89135c&_uhb=1

Motor drivers.
http://www.ebay.com.au/itm/NEW-L298-Based-Stepper-Motor-Driver-Board-Arduino-L298N-Controller-Module-/251103703466?pt=AU_B_I_Electrical_Test_Equipment&hash=item3a76f271aa&_uhb=1

your choice.
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