Powering 12V motor through shield and external power

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hello everyone,

let me begin saying i'm new arduino.  i attempting use arduino relay turn motor different directions based on input voltages.  i using uno seeed motor shield.

-i created code, , bench tested setup success....but attempted using arduino usb power source (with low voltage motor).
-i connected setup using 12v external power supply motor shield (with no motor connected) , saw 9v @ motor jacks, reversing polarity intended.
-when hooked 12v (0.6a max) motor, i'm seeing reversing polarity intended, @ 2.7v.

any ideas?

i apologize in advance if has been covered.

thanks!

what 12v supply?  can generate enough current?  using pwm?

circuit diagram?


Arduino Forum > Using Arduino > Motors, Mechanics, and Power (Moderator: fabioc84) > Powering 12V motor through shield and external power


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