how to get different OUTPUT voltages in ARM micro?

[behrooz2011]

Hey buddies,what's up?!

I'm using an ARM cortex M0 micro called FRDM-KL25Z (what a funky name! I knew that! ) . I'd like to run a simple motor at different speeds. How can I get different OUTPUT voltages to operate this armature ?

Do I need any extra component which generates altering DC voltages? if so what is this device called?

tnx guys

[behrooz2011]

It's a small DC motor(like an Armature). It is supposed to get connected to an ARM micro-controller and automatically change its speed. Actually I'd like to know how I can get altering OUTPUT voltages in this microcontroller. Should I use any special device which generates different voltages or does the ARM micorcontroller in the question "FRDM-KL25Z " have the ability to generate different output voltage?

[mac.6]

You need a DC motor driver, driven by PWM from the microcontroller.
Do not forget that KL25 is a 3.3v only microcontroller, it cannot tolerate 5v on its inputs.

[westfw]

1) A microcontroller does not (can not) drive a motor directly.  You need some sort of driver or controller.
2) (there are motor controllers that will vary motor speed based on a variable voltage.  They're not common.)
3) The peripheral that would give you a variable output voltage from a microcontroller is called a "Digital to Analog Converter" or DAC.  These are also relatively uncommon, but the KL25Z *does* have one.
4) It's more common to use PWM to control DC motor speed.  The KL25Z also has PWM outputs.  (they'll still need a driver to run a motor, but the driver is simpler than the one you'd need to use with the DAC.)

[zapta]

I'd like to run a simple motor at different speeds.

Can you provide more information about the motor you intend to use? (or are you also asking for a motor choice?)